Sources and credits

How sizes are chosen

Each object has a stated dimension: length, height, diameter or area. Published dimensions, estimates and selected reference examples are different kinds of evidence. All 153 objects have measurement notes and source links below. Fixed dimensions retain their published scope and edition; naturally variable objects use explicitly selected examples.

For published figures, we follow the source’s definition and date: total area includes water, a building height specifies its upper endpoint, and a planet’s mean diameter differs from its equatorial diameter. Where conversion or rounding is needed, it is recorded below. Animals and generic objects use reasonable representative sizes, labelled “Selected example”; their revealed value is a reference size, not a claim that every individual has that size.

Reference models and natural variation

The standing person is defined as 1.70 m tall and the unbranded bus as 12 m long. They are measuring references. The blue whale and giraffe are selected examples of 25 m and 5 m; individual animals vary. These values are fixed for fair, repeatable play, not estimates of a species-wide average.

Country outlines use Natural Earth via world-atlas. US state outlines use the Census Bureau’s simplified 2017 cartographic boundaries via us-atlas. Each outline has its own Lambert azimuthal equal-area projection. Every outline is scaled to its documented area figure. Texas and California use 2010 Census total area, including water; Alaska explicitly uses land area. France is metropolitan France including Corsica, Norway excludes Svalbard and Jan Mayen, and the US outline is the contiguous 48 states. Small islands and coastlines are simplified; the drawings are for comparing area, not measuring geographic distances.

If you spot a figure that looks wrong, write to the address on the about page.

Silhouettes and original artwork

The current animals (except the defined human reference), prehistoric animals and two sculptural landmarks use original AI-assisted illustrations traced into separate silhouette and detail vectors with Potrace. Buildings, equipment and vehicles use project-authored vector drafting. Their measured axes are calibrated separately from surface detail. Contours, fossil reconstructions and architectural details are illustrative; they are not specimen scans, engineering drawings or independently certified scientific reconstructions. Older challenge links retain their original artwork and measurements; the PhyloPic licences for that frozen artwork are preserved below.

Geographic geometry: Natural Earth and US Census cartographic boundaries.

The giraffe/person and blue whale/bus sharing illustrations are AI-assisted editorial artwork, separate from the calibrated game drawings. The Moon photograph in the space sharing card is Lunar Near Side, credited to NASA/Goddard Space Flight Center/Arizona State University. The card pairs it with the project's Natural Earth outline of Australia. Image use follows NASA's media guidelines; no endorsement is implied.

Planets and moons

The globe represents the published mean diameter. Surface details are simplified recognition cues informed by NASA's planetary descriptions, not photographic or topographic maps. Earth's land is projected from Natural Earth geometry. Cloud bands and crater positions on the other worlds are illustrative.

Saturn's rings help identify the planet, but the ruler and answer measure only its globe. The prominent ring extends to the NASA A-ring outer radius of 136,780 km; its viewing angle is illustrative. Fainter outer rings are omitted.

Silhouette	Credit	Licence
Crocodile: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
basketball hoop	Original project vector drafting; measured endpoints follow the cited equipment rules	Original artwork
soccer goal	Original project vector drafting; measured endpoints follow the cited equipment rules	Original artwork
city bus	Original project illustration	Original artwork
eiffel tower	Original project illustration	Original artwork
Statue Of Liberty: illustrative elevation	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Christ The Redeemer: illustrative elevation	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
burj khalifa	Original project illustration	Original artwork
Blue whale: selected 25 m example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Brachiosaurus: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
callisto	Original project vector; schematic recognition cues informed by NASA	Original artwork
Cat: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
ceres	Original project vector; schematic recognition cues informed by NASA	Original artwork
charon	Original project vector; schematic recognition cues informed by NASA	Original artwork
Chicken: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Diplodocus: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Dog: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Dolphin: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
earth	Original project vector; Natural Earth public-domain land geometry	Original artwork
Elephant: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Emperor Penguin: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
europa	Original project vector; schematic recognition cues informed by NASA	Original artwork
ganymede	Original project vector; schematic recognition cues informed by NASA	Original artwork
Giant Squid: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Giraffe: selected 5 m male example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Great White Shark: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Hippo: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Honey Bee: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Horse: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
human	Original project illustration	Original artwork
io	Original project vector; schematic recognition cues informed by NASA	Original artwork
jupiter	Original project vector; schematic recognition cues informed by NASA	Original artwork
Ladybug: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Lion: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Mammoth: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
mars	Original project vector; schematic recognition cues informed by NASA	Original artwork
Megalodon: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
mercury	Original project vector; schematic recognition cues informed by NASA	Original artwork
Monarch Butterfly: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
moon	Original project vector; schematic recognition cues informed by NASA	Original artwork
Mouse: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
neptune	Original project vector; schematic recognition cues informed by NASA	Original artwork
Orca: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Ostrich: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
pluto	Original project vector; schematic recognition cues informed by NASA	Original artwork
Polar Bear: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Pteranodon: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Quetzalcoatlus: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Rhino: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
saturn	Original project vector; schematic recognition cues informed by NASA	Original artwork
Sperm Whale: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Spinosaurus: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Stegosaurus: selected reconstruction	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
T Rex: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Tiger: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
titan	Original project vector; schematic recognition cues informed by NASA	Original artwork
Triceratops: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
triton	Original project vector; schematic recognition cues informed by NASA	Original artwork
uranus	Original project vector; schematic recognition cues informed by NASA	Original artwork
Velociraptor: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
venus	Original project vector; schematic recognition cues informed by NASA	Original artwork
Whale Shark: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork
Wolf: selected example	Original AI-assisted project illustration; vectorized with Potrace	Original artwork

Artwork in version 1 challenges

These attributions apply to the archived silhouettes served at /sil/v1/. New challenges use the current catalog.

Archived silhouette	Credit	Licence
Physeter macrocephalus	Uncredited	Public Domain Mark 1.0
Orcinus orca	Uncredited	CC0 1.0
Carcharodon carcharias	Steven Traver	CC0 1.0
Rhincodon typus	Christoph Schomburg	CC0 1.0
Tursiops truncatus	Uncredited	CC0 1.0
Loxodonta africana africana	Jan A. Venter, Herbert H. T. Prins, David A. Balfour & Rob Slotow (vectorized by T. Michael Keesey)	CC BY 3.0
Hippopotamus amphibius	Ivan Iofrida	CC BY 4.0
Ceratotherium simum	An Ignorant Atheist	CC0 1.0
Ursus maritimus	Margot Michaud	CC0 1.0
Panthera gombaszogensis	Margot Michaud	CC0 1.0
Panthera leo	Margot Michaud	CC0 1.0
Equus ferus caballus	An Ignorant Atheist	CC0 1.0
Struthio camelus	Marie Attard	Public Domain Mark 1.0
Aptenodytes forsteri	Uncredited	CC0 1.0
Canis familiaris familiaris	Margot Michaud	CC0 1.0
Felis lybica	Margot Michaud	CC0 1.0
Mus musculus	Ben Murrell	CC0 1.0
Gallus gallus domesticus	Arcadia Science	CC0 1.0
Architeuthis dux	Chris Forbes	CC BY 4.0
Apis mellifera	Lubna Maherally	CC0 1.0
Danaus plexippus	Andy Wilson	CC0 1.0
Coccinella undecimpunctata	Melissa Broussard	CC BY 3.0
Canis latrans	Jeff Haight	CC0 1.0
Tyrannosaurus rex	Matt Dempsey	CC BY 4.0
Triceratops horridus	Ivan Iofrida	CC BY 4.0
Stegosaurus stenops	Matt Dempsey	CC BY 4.0
Velociraptor mongoliensis	Uncredited	CC0 1.0
Brachiosaurus altithorax	Michael P. Taylor	CC0 1.0
Diplodocus carnegii	Scott Hartman	CC BY 3.0
Spinosaurus aegyptiacus	Alessio Ciaffi	CC BY 4.0
Pteranodon longiceps	Uncredited	CC0 1.0
Quetzalcoatlus northropi	Mark P. Witton & Darren Naish	CC BY 3.0
Mammuthus primigenius	artrociraptor	CC0 1.0
Otodus megalodon	Uncredited	Public Domain Mark 1.0

Every object and its figure

Animals

Blue whaleLength, Selected exampleA selected 25 m adult example within the 24–26 m range given by the Mammal Society. Size varies with population and sex; this is not a species-wide average or record. Measurement record A selected adult blue whale example, not a species-wide average or maximum. Snout to tail extremity along the straightened side-view body axis. Mammal Society gives adult length 24–26 m and notes larger females; NOAA distinguishes population and sex variation. 25 m falls within the published adult range. No particular measured individual is claimed. NOAA and Mammal Society species accounts, accessed 2026-11-13 Mammal Society: Size; NOAA: Appearance. Source checked: 2026-11-13.	25 m	NOAA Fisheries Mammal Society · adult length
Sperm whaleLength, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male length; females are substantially smaller. Front of the head to the farthest tail-fluke tip in lateral projection. ADW reports males reaching 19 m and females 12 m; 16 m is an adult male example. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	16 m	University of Michigan · Animal Diversity Web
OrcaLength, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male; straight snout-to-fluke total length. Snout to the farthest tail-fluke tip, along the horizontal body axis. ADW gives adult male average 8 m and maximum 9.75 m. 7 m is a smaller adult example, not the mean. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	7 m	University of Michigan · Animal Diversity Web
Great white sharkLength, typical adultSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult great white, straight snout-to-tail length. Snout to the farthest caudal-fin tip; dorsal and pectoral fins do not define length. ADW reports approximately 4 m males and larger females; 4.5 m is within the adult range. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	4.5 m	University of Michigan · Animal Diversity Web
Whale sharkLength, typical adultSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult whale shark, total length including caudal fin. Snout to the farthest caudal-fin tip along the horizontal axis. ADW gives 7 m average with much larger individuals; 10 m is a large adult example, not the maximum. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	10 m	University of Michigan · Animal Diversity Web
Bottlenose dolphinLength, typical adultSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult common bottlenose dolphin, total length. Beak tip to the farthest tail-fluke tip along the body axis. ADW gives adult lengths 2.28–3.81 m; the selected 3 m lies within this range. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	3 m	University of Michigan · Animal Diversity Web
African elephantShoulder height, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male African bush elephant; shoulder height, not head or ear height. Ground under the feet to the withers; excludes head and ears. ADW gives male shoulder heights of 3.2–4 m. The selected height is at the lower end. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	3.2 m	University of Michigan · Animal Diversity Web
GiraffeHeight, Selected exampleA selected 5 m male example. The GCF guide gives 5.3 m as the average adult male height; individuals vary. Measurement record A selected adult male giraffe example; not a claimed species-wide average. Ground under the hooves to the top of the upright silhouette, including ossicones. GCF lists adult male average height 5.3 m, female average 4.3 m, and male maximum 6 m. 5 m is a reasonable adult male example near the published average. Natural variation does not require a specimen measured at exactly 5 m. GCF Conservation Guide 2022 Printed p. 3, height facts (fourth PDF spread). Source checked: 2026-11-13.	5 m	Giraffe Conservation Foundation · p. 3
HippopotamusLength, typical adultSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult hippopotamus, total horizontal profile length. Front of muzzle to the rear extremity of the horizontal profile, including the short tail. ADW gives total lengths of 2.09–5.05 m, including a short tail. The 3.5 m example is within that range. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	3.5 m	University of Michigan · Animal Diversity Web
White rhinocerosLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult white rhinoceros; head-body length, excluding tail and projecting horn. Snout to rump in side elevation; excludes the projecting horn and tail. ADW gives head-body lengths around 3.35–3.77 m; 3.8 m is a rounded large adult example. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	3.8 m	University of Michigan · Animal Diversity Web
Polar bearLength, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male polar bear, nose to short tail. Nose to the short tail at the rear of the horizontal profile. ADW reports adult males reaching 2.5 m; selected large adult, not the mean of both sexes. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	2.5 m	University of Michigan · Animal Diversity Web
Bengal tigerLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Bengal tiger example; snout to rump, excluding tail. Bengal tiger example; snout to rump, excluding tail. Zoo lists tiger length 1.5–2.9 m depending on sex and location; 1.9 m is a head-body reference, not total length including tail. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	1.9 m	San Diego Zoo Wildlife Alliance
LionLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male lion; head-body length excluding the tail. Nose to tail root at the rump; the long tail is outside the measuring span. ADW gives total lengths 2.4–3.3 m and tails 0.6–1 m. A 1.95 m head-body example is consistent with those dimensions, not a quoted specimen. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	1.95 m	University of Michigan · Animal Diversity Web
HorseShoulder heightSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult riding horse; ground to withers, not ears. Ground under the feet to the withers; excludes head and ears. ADW describes breed variation with heights around 0.9–1.7 m and outliers. The 1.6 m reference represents a riding horse. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	1.6 m	University of Michigan · Animal Diversity Web
Saltwater crocodileLength, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male saltwater crocodile; straightened snout-to-tail length. Snout tip to the tip of the straightened tail. ADW reports male maxima around 6–7 m. The selected 4.5 m is an adult example below those maxima. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	4.5 m	University of Michigan · Animal Diversity Web
OstrichHeight, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male ostrich, ground to crown with upright neck. Adult male ostrich, ground to crown with upright neck. Male height is given as 6.9–9 ft (about 2.1–2.7 m); 2.4 m lies within that interval. The source has a typographic decimal error in its lower metre figure; the feet interval is unambiguous. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	2.4 m	San Diego Zoo Wildlife Alliance
Emperor penguinHeight, typical adultSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Standing adult emperor penguin; feet to crown. Ground under the feet to the top of the upright animal. ADW gives adult height 1.01–1.32 m; 1.1 m lies within the range. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	1.1 m	University of Michigan · Animal Diversity Web
Adult humanHeight, Selected exampleA figure defined as 1.70 m tall for this game. It is a measuring reference, not a claim about average human height. Measurement record A standing person defined as 1.70 m tall; not a population average. Ground under the feet to the crown of the head. An explicitly defined measuring reference; no external measurement is asserted. Project reference definition v1 Reference models and natural variation. Source checked: 2026-11-13.	1.7 m	Reference model
Siberian HuskyShoulder height, adult maleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult male Siberian Husky; ground to withers, excluding head and ears. Adult male Siberian Husky; ground to withers, excluding head and ears. Breed standard: males 21–23.5 inches at withers = 0.5334–0.5969 m. Selected 0.57 m lies within it. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	57 cm	American Kennel Club
House catLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Domestic short-haired cat example, snout to rump; excludes tail and whiskers. Domestic short-haired cat example, snout to rump; excludes tail and whiskers. ADW gives average total length 76.2 cm and emphasizes breed variation. The 46 cm head-body example leaves about 30 cm for a tail; it is an editorial model, not a reported head-body mean. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	46 cm	University of Michigan · Animal Diversity Web
House mouseLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult house mouse; nose to rump, excluding the tail. Nose to rump; tail and whiskers are outside the measuring span. ADW explicitly gives head-body length 65–95 mm; the selected 85 mm lies within it. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	8.5 cm	University of Michigan · Animal Diversity Web
ChickenHeightSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Standing domestic hen; ground to top of comb. Standing domestic hen; ground to top of comb. Park’s animal-care species page gives height 15–65 cm depending on breed; selected 40 cm is a medium hen. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	40 cm	Malkia Park
Giant squidLength, including tentaclesSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Giant squid total length, mantle tip to extended feeding tentacle tips. Giant squid total length, mantle tip to extended feeding tentacle tips. Museum describes females reaching about 13 m and males about 10 m. A selected 12 m female example includes the long feeding tentacles. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	12 m	Natural History Museum, London
Honey beeLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult worker western honey bee; head through abdomen, excluding antennae. Front of head to tip of abdomen in dorsal view; excludes antennae, wings and legs. ADW gives worker length 10–15 mm; the selected 13 mm is not a queen or drone. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	1.3 cm	University of Michigan · Animal Diversity Web
Monarch butterflyWingspanSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult monarch with wings fully spread; wingtip to wingtip. Fully extended wingtip to opposite wingtip. ADW gives wingspan 8.6–12.4 cm; the selected 10 cm lies within it. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	10 cm	University of Michigan · Animal Diversity Web
Seven-spot ladybirdLengthSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Adult seven-spot ladybird; body length excluding antennae. Front of head to rear of elytra/abdomen in dorsal view; excludes antennae and legs. ADW gives adult length 6.5–7.8 mm; the selected 7 mm lies within it. A practical selected example supported by the documented variation. This is neither a universal average nor a claim about an exactly measured individual. Species account accessed 2026-11-13 Physical Description / adult size Source checked: 2026-11-13.	7 mm	University of Michigan · Animal Diversity Web
Grey wolfLength, head and bodySelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Gray wolf; nose to tail root, not tail tip. Gray wolf; nose to tail root, not tail tip. Field protocol separates body, tail and total length; female body-length range 112–145 cm supports a 130 cm head-body example. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	1.3 m	US National Park Service · Yellowstone wolf field protocol

Dinosaurs and prehistoric life

Tyrannosaurus rexLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated straight snout-to-tail total length of the reconstruction. Estimated straight snout-to-tail total length of the reconstruction. NHM describes typical length around 12 m and large Sue/Scotty individuals almost 13 m. Selected 12.3 m is within those estimates. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	12.3 m	Natural History Museum, London
TriceratopsLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated straight snout-to-tail total length of the reconstruction. Estimated straight snout-to-tail total length of the reconstruction. NHM lists a 9 m reconstruction; 8.5 m is a slightly smaller selected example. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	8.5 m	Natural History Museum, London
StegosaurusLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated straight snout-to-tail total length of the reconstruction. Estimated straight snout-to-tail total length of the reconstruction. NHM lists 9 m for the genus. Adopt the museum’s estimate for this reconstruction. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	9 m	Natural History Museum, London
VelociraptorLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated straight snout-to-tail total length of the reconstruction. Estimated straight snout-to-tail total length of the reconstruction. NHM lists 1.8 m. Adopt that estimate; feather covering is part of the illustration. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	1.8 m	Natural History Museum, London
BrachiosaurusHeight, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated ground-to-head height with raised neck; not shoulder height or a mounted-skeleton measurement. Estimated ground-to-head height with raised neck; not shoulder height or a mounted-skeleton measurement. USGS educational account gives 12 m height and 23 m length. Historic reconstructions and neck posture differ; this is a selected estimate, not a claim that all specimens stood 12 m. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	12 m	US Geological Survey
DiplodocusLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated straight snout-to-tail total length of the reconstruction. Estimated straight snout-to-tail total length of the reconstruction. NHM lists a 26 m reconstruction, including the long whip tail. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	26 m	Natural History Museum, London
SpinosaurusLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated straight snout-to-tail total length of the reconstruction. Estimated straight snout-to-tail total length of the reconstruction. NHM lists 14 m. Body proportions and posture remain debated; the drawing is an illustrative reconstruction. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	14 m	Natural History Museum, London
PteranodonWingspan, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated fully extended wingtip-to-wingtip span of Pteranodon longiceps. Estimated fully extended wingtip-to-wingtip span of Pteranodon longiceps. AMNH gives wingspans up to 6 m. Selected large adult reconstruction. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	6 m	American Museum of Natural History
QuetzalcoatlusWingspan, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated fully extended wingtip-to-wingtip span of Quetzalcoatlus northropi. Estimated fully extended wingtip-to-wingtip span of Quetzalcoatlus northropi. Research team describes the giant species with an approximately 40-foot span; NHM gives around 11 m. A selected 10.5 m estimate is not the smaller Q. lawsoni species. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	10.5 m	University of Texas at Austin Natural History Museum · 2021 research report
Woolly mammothShoulder height, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Woolly mammoth reconstruction; ground to shoulder, excluding cranial dome and tusks. Woolly mammoth reconstruction; ground to shoulder, excluding cranial dome and tusks. NHM describes woolly mammoths at 3–3.5 m shoulder height; selected 3.1 m lies within it. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	3.1 m	Natural History Museum, London
MegalodonLength, estimate from fossilsEstimated reconstruction. Fossil evidence and reconstructions vary; this round uses a selected estimate. Measurement record Estimated total snout-to-tail length of Otodus megalodon. Estimated total snout-to-tail length of Otodus megalodon. Tooth-based estimates discussed by the museum place large animals at 15–18 m; newer estimates can be larger. The selected 15 m is not a maximum-size claim. No complete skeleton establishes a unique silhouette. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	15 m	Natural History Museum, London

Planets and moons

MercuryDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 2,439.4 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	4,878.8 km	NASA/JPL Solar System Dynamics
VenusDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 6,051.8 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	12,103.6 km	NASA/JPL Solar System Dynamics
EarthDiameter, averageMean radius 6,371.0084 km × 2, rounded to a mean diameter of 12,742 km. The circular drawing uses the mean, not equatorial, diameter. Measurement record Mean diameter derived from mean radius; not equatorial diameter. Diameter across the centre of the mean-size disc. Published value: 6,371.0084 km (mean radius × 2 for diameter). Rounded to the nearest 1 km after conversion. JPL Planetary Physical Parameters; reference [D], IAU 2015 report (Archinal et al., 2018) Earth row, Mean Radius (km), reference [D]. Diameter rounded to the nearest kilometre. Source checked: 2026-11-13.	12,742 km	NASA/JPL · IAU 2015 report
MarsDiameter, averageMean radius 3,389.50 km × 2 = 6,779 km. The circular drawing uses the mean, not equatorial, diameter. Measurement record Mean diameter derived from mean radius; not equatorial diameter. Diameter across the centre of the mean-size disc. Published value: 3,389.5 km (mean radius × 2 for diameter). JPL Planetary Physical Parameters; reference [D], IAU 2015 report (Archinal et al., 2018) Mars row, Mean Radius (km), reference [D]. Twice the listed radius is 6,779 km. Source checked: 2026-11-13.	6,779 km	NASA/JPL · IAU 2015 report
JupiterDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 69,911 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	139,822 km	NASA/JPL Solar System Dynamics
SaturnDiameter, without the ringsPublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 58,232 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	116,464 km	NASA/JPL Solar System Dynamics
UranusDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 25,362 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	50,724 km	NASA/JPL Solar System Dynamics
NeptuneDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 24,622 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	49,244 km	NASA/JPL Solar System Dynamics
The MoonDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 1,737.4 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	3,474.8 km	NASA/JPL Solar System Dynamics
IoDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 1,821.49 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	3,642.98 km	NASA/JPL Solar System Dynamics
EuropaDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 1,560.8 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	3,121.6 km	NASA/JPL Solar System Dynamics
GanymedeDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 2,631.2 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	5,262.4 km	NASA/JPL Solar System Dynamics
CallistoDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 2,410.3 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	4,820.6 km	NASA/JPL Solar System Dynamics
TitanDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 2,574.76 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	5,149.52 km	NASA/JPL Solar System Dynamics
TritonDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 1,352.6 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	2,705.2 km	NASA/JPL Solar System Dynamics
PlutoDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 1,188.3 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	2,376.6 km	NASA/JPL Solar System Dynamics
CeresDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 469.7 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	939.4 km	NASA/JPL Solar System Dynamics
CharonDiameter, averagePublished dimension. See the measurement record for scope, date and conversions. Measurement record Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects. Diameter across the centre of the disc. Published value: 606 km (mean radius × 2 for diameter). JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius. Source checked: 2026-11-13.	1,212 km	NASA/JPL Solar System Dynamics

Countries and states

CanadaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 9,984,670 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	9,984,670 km²	United Nations Statistics Division
Contiguous United StatesAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Contiguous 48 states plus DC; total area including water, excluding Alaska and Hawaii. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 8,081,867 km². 2010 Census State Area Measurements; derived contiguous total United States total 9833517 − Alaska total 1723337 − Hawaii total 28313 = 8081867 km². Arithmetic uses the published integer km² columns. Source checked: 2026-11-13.	8,081,867 km²	US Census Bureau · 2010
BrazilAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 8,515,767 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	8,515,767 km²	United Nations Statistics Division
AustraliaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Australia including Norfolk Island; excludes external Antarctic claims. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 7,692,024 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: Including Norfolk Island. , 2023 Source checked: 2026-11-13.	7,692,024 km²	United Nations Statistics Division
KazakhstanAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 2,724,902 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	2,724,902 km²	United Nations Statistics Division
AlgeriaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 2,381,741 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	2,381,741 km²	United Nations Statistics Division
Congo - KinshasaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 2,345,410 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	2,345,410 km²	United Nations Statistics Division
GreenlandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Greenland including the ice sheet; not the ice-free area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 2,166,086 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	2,166,086 km²	United Nations Statistics Division
MexicoAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,964,375 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,964,375 km²	United Nations Statistics Division
IndonesiaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,910,931 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,910,931 km²	United Nations Statistics Division
IranAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,630,848 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,630,848 km²	United Nations Statistics Division
MongoliaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,564,116 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,564,116 km²	United Nations Statistics Division
PeruAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,285,216 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,285,216 km²	United Nations Statistics Division
South AfricaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,221,037 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,221,037 km²	United Nations Statistics Division
ColombiaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,141,748 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	1,141,748 km²	United Nations Statistics Division
NigeriaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 923,768 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	923,768 km²	United Nations Statistics Division
ChileAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Chile as reported by the UN; excludes Antarctic territorial claims. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 756,102 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	756,102 km²	United Nations Statistics Division
MadagascarAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 587,041 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	587,041 km²	United Nations Statistics Division
FranceArea, European part onlyPublished dimension. See the measurement record for scope, date and conversions. Measurement record Metropolitan France, including Corsica; excludes overseas departments and territories. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 551,500 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	551,500 km²	United Nations Statistics Division
SpainAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Spain including the Balearic and Canary Islands; not mainland-only Spain. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 506,008 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	506,008 km²	United Nations Statistics Division
SwedenAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 438,574 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	438,574 km²	United Nations Statistics Division
GermanyAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 357,581 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	357,581 km²	United Nations Statistics Division
FinlandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Land and inland fresh water, including Åland; excludes sea water. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 338,491 km². Finland in Figures 2025; 1 January 2025 Geographical data: Finland’s area, 1 January 2025. Area = 304000 land + 34491 fresh water. Source checked: 2026-11-13.	338,491 km²	Statistics Finland / National Land Survey
PolandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 312,679 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	312,679 km²	United Nations Statistics Division
ItalyAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 302,068 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	302,068 km²	United Nations Statistics Division
New ZealandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record New Zealand, excluding Cook Islands, Niue and Tokelau. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 268,107 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	268,107 km²	United Nations Statistics Division
United KingdomAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record United Kingdom, excluding Channel Islands and Isle of Man. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 242,495 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: Excluding Channel Islands (Guernsey and Jersey) and Isle of Man, shown separately, if available. , 2023 Source checked: 2026-11-13.	242,495 km²	United Nations Statistics Division
CubaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 109,884 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	109,884 km²	United Nations Statistics Division
IcelandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 103,000 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	103,000 km²	United Nations Statistics Division
IrelandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 69,825 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	69,825 km²	United Nations Statistics Division
AlaskaArea, land areaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Alaska land area only, including Aleutian islands. Water area excluded. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 1,477,953 km². 2010 Census State Area Measurements Alaska row: Land Area / Sq. Km., not Total Area. Source checked: 2026-11-13.	1,477,953 km²	US Census Bureau · 2010
TexasAreaTotal area, including water, from the 2010 Census table. Simplified 2017 Census outlines are rescaled to these areas. Measurement record State total area, including land and water; not land area alone. Filled area of the simplified 2017 Census outline, scaled to the published 2010 total. Published value: 695,662 km². 2010 Census State Area Measurements Texas row, Total Area / Sq. Km. (land-only column: 676,587). Source checked: 2026-11-13.	695,662 km²	US Census Bureau · 2010
CaliforniaAreaTotal area, including water, from the 2010 Census table. Simplified 2017 Census outlines are rescaled to these areas. Measurement record State total area, including land and water; not land area alone. Filled area of the simplified 2017 Census outline, scaled to the published 2010 total. Published value: 423,967 km². 2010 Census State Area Measurements California row, Total Area / Sq. Km. (land-only column: 403,466). Source checked: 2026-11-13.	423,967 km²	US Census Bureau · 2010
NorwayArea, without SvalbardPublished dimension. See the measurement record for scope, date and conversions. Measurement record Mainland Norway and coastal islands; land and fresh water, excluding Svalbard and Jan Mayen. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 323,807 km². SSB, updated 26 January 2026 Table 1: The mainland, In all, 2026. Source checked: 2026-11-13.	323,807 km²	Statistics Norway / Norwegian Mapping Authority
AustriaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 83,878 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	83,878 km²	United Nations Statistics Division
SwitzerlandAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 41,291 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	41,291 km²	United Nations Statistics Division
DenmarkAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Denmark proper, excluding Greenland and Faroe Islands. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 42,938 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: Excluding Faeroe Islands and Greenland shown separately, if available. , 2023 Source checked: 2026-11-13.	42,938 km²	United Nations Statistics Division
NamibiaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 825,229 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	825,229 km²	United Nations Statistics Division
MozambiqueAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 799,380 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	799,380 km²	United Nations Statistics Division
BotswanaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 582,000 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	582,000 km²	United Nations Statistics Division
Sri LankaAreaPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surface area of the named country/territory as reported by the UN; not land-only area. Filled area of an equal-area projected outline, calibrated to the adopted published area. Published value: 65,610 km². UNData country profile / 2025 World Statistics Pocketbook; area reference year 2023 General information: Surface area (km²); footnotes: 2023 Source checked: 2026-11-13.	65,610 km²	United Nations Statistics Division

Everyday objects

BananaLengthSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected medium banana; cultivar and curvature vary. Straight end-to-end span of the illustrated banana, not an arc along the peel. USDA medium category is 7 to 7⅞ inches long (17.78–20.00 cm). Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 USDA Release 28, report 2017-03-15; medium portion heading. Source checked: 2026-11-13.	19 cm	USDA · SR Legacy 09040
AA batteryLength, largest recordedPublished dimension. See the measurement record for scope, date and conversions. Measurement record AA/LR6 maximum overall length, including positive terminal. AA/LR6 maximum overall length, including positive terminal. Published value: 0.0505 m. Published specification accessed 2026-11-13 Energizer E91 dimension drawing: overall 49.20–50.50 mm; upper envelope adopted, not a universal exact cell length. Source checked: 2026-11-13.	5.05 cm	Energizer · engineering datasheet (distributor-hosted)
Credit cardWidth, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record ISO ID-1 / CR80 nominal card width along the long edge. ISO ID-1 / CR80 nominal card width along the long edge. Published value: 0.0856 m. Published specification accessed 2026-11-13 Plastic Cards: ISO 7810 dimensions 53.98 × 85.60 mm. Source checked: 2026-11-13.	8.56 cm	Matica · card printer specification
A4 sheet of paperHeight, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record A4 nominal long-edge height, not US Letter paper. A4 nominal long-edge height, not US Letter paper. Published value: 0.297 m. Published specification accessed 2026-11-13 Die Maße der A-Formate: A4 height 297 mm, width 210 mm. Source checked: 2026-11-13.	29.7 cm	DIN
New pencilLengthSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record New full-length wooden pencil with eraser. Eraser end to graphite point. 7.5 inches = 190.5 mm; selected example rounded to 19 cm. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Specifications: pencil length 7.5 inches. Source checked: 2026-11-13.	19 cm	Target · Ticonderoga product specification
US quarterDiameter, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record US quarter dollar outside diameter. US quarter dollar outside diameter. Published value: 0.02426 m. Published specification accessed 2026-11-13 Quarter: diameter 24.26 mm; divide by 1000 for metres. Source checked: 2026-11-13.	2.426 cm	US Mint
12-inch vinyl recordDiameter, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected 12-inch LP pressing, approximately 30.2 cm across. Outside diameter, excluding the centre hole from neither endpoint. The pressing technical drawing allows 300.8–302.4 mm outside diameter for Type 30 records. 302 mm is a representative 12-inch class record within the manufacturer range, not a universal exact diameter. GZ Media technical conditions, revision 10 (2017-02-07), SNA-GZ copy Page 2, Type 30 dimensional diagram: outside diameter 300.8–302.4 mm. Source checked: 2026-11-13.	30.2 cm	GZ Media · manufacturing specifications SNA-GZ technical documents
CDDiameter, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record 120 mm CD-ROM outer diameter; not the centre-hole diameter or an 80 mm mini CD. 120 mm CD-ROM outer diameter; not the centre-hole diameter or an 80 mm mini CD. Published value: 0.12 m. Published specification accessed 2026-11-13 ECMA-130, second edition June 1996: 120 mm optical data disks. Source checked: 2026-11-13.	12 cm	Ecma International
Interior doorHeight, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected US 80-inch-class interior door leaf; excludes frame. Bottom to top of the door leaf, excluding frame and threshold. 80 inches = 2.032 m nominal; actual trim and regional door sizes differ. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Product title: 80-inch nominal door height. Source checked: 2026-11-13.	2.03 m	JELD-WEN · product specification
BathtubLength, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected 60-inch-class bathtub, not internal bathing length. Outside end to outside end of tub rim. The manufacturer drawing gives 1.524 m outside length; selected example 1.52 m. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 K-1946-RAW overall length dimension 60 inches / 1524 mm. Source checked: 2026-11-13.	1.52 m	Kohler · engineering specification
Acoustic guitarLengthSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected full-size acoustic guitar; not scale length or body-only length. Base of body to end of headstock. Manufacturer full-size examples span approximately 0.995–1.029 m. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Specifications: total length, C40 995 mm and F310 1029 mm. Source checked: 2026-11-13.	1 m	Yamaha
SmartphoneHeightSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Unbranded 15 cm-class smartphone, without case. Bottom to top of device body. A manufacturer example is 147.6 mm tall; the drawing is not claimed to depict this exact model. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Size and Weight: height 147.6 mm. Source checked: 2026-11-13.	15 cm	Apple · iPhone 15 technical specification
US dollar billLength, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record Modern US banknote long edge; the same small-size format used by the one-dollar note. Modern US banknote long edge; the same small-size format used by the one-dollar note. Published value: 0.156 m. Published specification accessed 2026-11-13 1929 Standardization of Design: 6.14 inches × 25.4 = 155.956 mm, rounded to 156 mm. Source checked: 2026-11-13.	15.6 cm	US Currency Education Program
2×4 LEGO brickLength, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record Classic 2×4 brick 3001 external body length, excluding nominal grid clearance. Classic 2×4 brick 3001 external body length, excluding nominal grid clearance. Published value: 0.0318 m. Published specification accessed 2026-11-13 Technical drawing long edge: 31.8 mm; nominal stud pitch is 8 mm, not a 32 mm external length. Source checked: 2026-11-13.	3.18 cm	Christoph Bartneck · measured technical drawing
Rubik's CubeWidth, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected 57 mm 3×3 cube; other editions and speed cubes vary. Left to right edge of the front-facing square face; no perspective shortening. This licensed catalogue provides a 57 mm cube example. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Rubik’s 3×3, pp. 8–9: 57 × 57 × 57 mm. Source checked: 2026-11-13.	5.7 cm	Preseli · licensed Rubik’s product catalogue
Wine bottleHeight, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected 750 mL Bordeaux-style bottle. Base to bottle lip; excludes any projecting cork. Manufacturer example has a nominal height of 300 mm; bottle shapes and closures vary. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Dimensioned bottle drawing: height 300 mm. Source checked: 2026-11-13.	30 cm	Cristallo · Bordeaux bottle drawing
Soda canHeight, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected approximately 12.2 cm standard 355 mL beverage can. Base to top of the illustrated can; pull tab does not extend above the rim. Engineering drawing gives 122.22 mm before final seaming. This rounded illustration is not a closed-can manufacturing specification. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Standard 12 oz can body, flanged open-can height 122.22 mm. Source checked: 2026-11-13.	12.2 cm	Ball · 12 oz standard can engineering drawing
BicycleLengthSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected adult bicycle, wheels aligned; not a frame size. Rear tyre extremity to front tyre extremity. A 1050 mm wheelbase plus approximately 700 mm outer wheel diameter gives roughly 1.75 m overall. This is an illustrative calculation, not an exact manufacturer overall-length claim. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 2027 Heist 2, geometry: S wheelbase 1050 mm; 700C wheels. Source checked: 2026-11-13.	1.75 m	Polygon Bikes · Heist 2 geometry

Sports

Soccer ballDiameter, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected size 5 association-football ball. Diameter through centre. Dividing circumference by π gives diameter 21.65–22.28 cm. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 2026/27 Law 2.1, circumference 68–70 cm. Source checked: 2026-11-13.	22 cm	The IFAB
BasketballDiameter, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected men’s size 7 basketball; not a women’s size 6. Diameter through centre. Circumference / π gives approximately 238.7–245.1 mm diameter. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Ball specification, size 7: circumference 750–770 mm. Source checked: 2026-11-13.	24 cm	FIBA · Basketball Equipment 2020
Tennis ballDiameter, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected Type 2 tennis ball, not a larger Type 3 or junior ball. Diameter through centre. Selected 6.7 cm diameter lies inside the permitted range. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Appendix I, printed p. 19, Type 2 size 6.54–6.86 cm. Source checked: 2026-11-13.	6.7 cm	ITF · Rules of Tennis 2026
BaseballDiameter, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected regulation baseball. Diameter through centre; seams included in illustrated outside boundary. Inch circumference converted exactly then divided by π gives about 72.77–74.79 mm diameter. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Rule 3.1, printed p. 12, circumference 9–9¼ inches. Source checked: 2026-11-13.	7.4 cm	WBSC · Official Rules of Baseball 2023–2024
Golf ballDiameter, minimum diameterSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Example at the published minimum diameter; larger conforming balls exist. Diameter through centre. 42.67 mm is a lower bound, not the unique permitted diameter. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Part 4, section 3, Size: minimum diameter 42.67 mm. Source checked: 2026-11-13.	4.27 cm	The R&A / USGA · Equipment Rules
Bowling ballDiameter, Selected exampleSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected tenpin bowling ball. Diameter through centre, ignoring the depth of finger holes. The limits convert to 215.9–218.313 mm. A 216 mm example falls within them. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Tenpin bowling ball diameter limits: 8.500–8.595 inches. Source checked: 2026-11-13.	21.6 cm	USBC · Equipment Specifications Manual
Basketball hoopHeight, to the rimPublished dimension. See the measurement record for scope, date and conversions. Measurement record Nominal regulation height to the TOP edge of the rim, not the backboard. Court surface to top of ring. Published value: 3.05 m. Source edition described below; accessed 2026-11-13 Section 3.4: ring upper edge 3050 mm ±6 mm. Source checked: 2026-11-13.	3.05 m	FIBA · Basketball Equipment 2018
Soccer goalWidth, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record Regulation clear opening between posts; excludes post thickness. Inside edge of left post to inside edge of right post. Published value: 7.32 m. Source edition described below; accessed 2026-11-13 2026/27 Law 1.10: distance between the inside of posts. Source checked: 2026-11-13.	7.32 m	The IFAB
Tennis courtLength, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record Regulation court length, excluding surrounding run-off space. Outside edge of one baseline to outside edge of the other. Published value: 23.77 m. Source edition described below; accessed 2026-11-13 Rule 1, printed p. 2: 23.77 m, dimensions to outside of lines. Source checked: 2026-11-13.	23.77 m	ITF · Rules of Tennis 2026
Soccer pitchLength, UEFA category 3/4Published dimension. See the measurement record for scope, date and conversions. Measurement record UEFA category 3/4 pitch; other football pitches may have different permitted lengths. Goal line to goal line; excludes run-off areas. Published value: 105 m. Source edition described below; accessed 2026-11-13 Article 5, category 3 and 4 table: 105 × 68 m. Source checked: 2026-11-13.	105 m	UEFA · Stadium Infrastructure Regulations 2025
Olympic swimming poolLength, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record Nominal long-course racing length between installed touch panels; excludes pool deck. Inside racing boundary at one end to the other. Published value: 50 m. Source edition described below; accessed 2026-11-13 Length and dimensional tolerances: 50 m pool. Source checked: 2026-11-13.	50 m	World Aquatics · Swimming Pool Certification 2024

Vehicles and craft

Mid-size sedanLengthSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Unbranded midsize sedan in the 4.9 m class. Rear to front bumper, excluding accessories. The manufacturer example measures 4.920 m; illustration is not a specific model. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 Dimensions: length 4920 mm. Source checked: 2026-11-13.	4.9 m	Toyota · Camry specifications
City busLength, Selected exampleA 12 m reference bus, not a specific model. The manufacturer’s Citaro specification is 12.135 m; the drawing represents the 12 m class. Measurement record An unbranded city bus in the 12 m class; not a specific Citaro model. Rear to front body extremity in side elevation; mirrors do not define length. The manufacturer lists 12.135 m for this Citaro model. 12 m is a practical representative length for this bus class. The game does not claim a 12 m Citaro specification. Citaro technical brochure; undated retained copy reviewed 2026-11-13 Printed pp. 2–3, Citaro (two-door), Length: 12,135 mm. Source checked: 2026-11-13.	12 m	Mercedes-Benz Buses · pp. 2–3
London double-decker busHeightSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record Selected London-style double-decker bus, not a specific vehicle specification. Ground under tyres to roof; no advertising equipment. Engineering vehicle template for New Routemaster gives 4.422 m overall height; 4.4 m represents this class. Selected illustrative example within this product class or published range; not a universal size or an exact named product. Source edition described below; accessed 2026-11-13 CA5441 CT007 revision A, vehicle profile: overall body height 4.422 m. Source checked: 2026-11-13.	4.4 m	Caneparo Associates · vehicle tracking drawing
40-foot shipping containerLength, standard sizePublished dimension. See the measurement record for scope, date and conversions. Measurement record 40-foot ISO container nominal external overall length; not cargo-space internal length. 40-foot ISO container nominal external overall length; not cargo-space internal length. Published value: 12.192 m. Published specification accessed 2026-11-13 Container specification / external 40 ft = 12,192 mm. Source checked: 2026-11-13.	12.192 m	Hapag-Lloyd
Boeing 747-8LengthPublished dimension. See the measurement record for scope, date and conversions. Measurement record 747-8 Intercontinental overall length, not 747-400 length. 747-8 Intercontinental overall length, not 747-400 length. Published value: 76.3 m. Published specification accessed 2026-11-13 747-8 cross section and dimensions: side view 76.3 m (250 ft 2 in), manufacturer metre precision retained. Source checked: 2026-11-13.	76.3 m	Boeing
RMS TitanicLengthPublished dimension. See the measurement record for scope, date and conversions. Measurement record RMS Titanic overall length, not length between perpendiculars. RMS Titanic overall length, not length between perpendiculars. Published value: 269.1 m. Published specification accessed 2026-11-13 Dimensions: 882 ft 9 in overall = 269.0628 m; rounded to 0.1 m. Source checked: 2026-11-13.	269.1 m	Titanic International Society
Saturn V rocketHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Apollo–Saturn V complete launch stack including escape tower; excludes crawler and launch platform. Apollo–Saturn V complete launch stack including escape tower; excludes crawler and launch platform. Published value: 110.6 m. Published specification accessed 2026-11-13 Information Summaries: Apollo-Saturn V height 110.6 m (363 ft). Source checked: 2026-11-13.	110.6 m	NASA
International Space StationWidthPublished dimension. See the measurement record for scope, date and conversions. Measurement record Overall span across the solar-array/truss axis; not pressurized module length. Overall span across the solar-array/truss axis; not pressurized module length. Published value: 109 m. Published specification accessed 2026-11-13 ISS structure measures 109 m across arrays, by 51 m module length. Source checked: 2026-11-13.	109 m	NASA
Hindenburg airshipLengthPublished dimension. See the measurement record for scope, date and conversions. Measurement record LZ 129 Hindenburg overall nose-to-tail length. LZ 129 Hindenburg overall nose-to-tail length. Published value: 245 m. Published specification accessed 2026-11-13 Technical data: Length 245 meters. Museum archive article, 31 July 2024. Source checked: 2026-11-13.	245 m	Zeppelin Museum
Ultra-large container shipLength, largest ships builtSelected example. Individuals and models vary; this is the reference size used for this round. Measurement record An unbranded 400 m class ultra-large container ship, overall bow-to-stern length. An unbranded 400 m class ultra-large container ship, overall bow-to-stern length. Port’s vessel record gives Ever Given length 400 m. This drawing is a class example, not a detailed vessel plan. A selected reference example within the documented size class; not a universal average, maximum or exact specimen measurement. Source accessed 2026-11-13 Size / physical description or technical dimensions Source checked: 2026-11-13.	400 m	Port of Hamburg

Landmarks and towers

Great Pyramid of GizaHeight, as it stands todayPublished dimension. See the measurement record for scope, date and conversions. Measurement record Surviving Great Pyramid height above its base; not reconstructed original height. Surviving Great Pyramid height above its base; not reconstructed original height. Published value: 138.75 m. Published specification accessed 2026-11-13 The Treasures of the Pyramids, Stadelmann chapter: surviving height 138.75 m, original 146.59 m. Source-specific published figure; other surveys and references use different rounding. Source checked: 2026-11-13.	138.75 m	Rainer Stadelmann · Harvard Giza Project archive Harvard Digital Giza publication record
Eiffel TowerHeight, to the tip330 m from the ground to the antenna tip, including the antenna installed in March 2022. Measurement record Overall height including the antenna installed in March 2022. Ground to antenna tip; not roof height or the previous 324 m height. Published value: 330 m. Antenna installation on 2022-03-15 Section: 2022 — 330 meters. Source checked: 2026-11-13.	330 m	Société d’Exploitation de la Tour Eiffel
Big BenHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Elizabeth Tower overall height, not the Big Ben bell. Ground or specified base to the named top endpoint. Published value: 96 m. Publisher page reviewed 2026-11-13 Tower height: 96 metres; publisher precision retained. Source checked: 2026-11-13.	96 m	UK Parliament
Leaning Tower of PisaHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Above-ground height; municipality’s approximately 56 m figure, not foundation-to-top length. Above-ground height; municipality’s approximately 56 m figure, not foundation-to-top length. Published value: 56 m. Published specification accessed 2026-11-13 Municipal description: circa 56 metri. Published whole-metre precision retained; no unsupported 56.67 m precision or high-side label. Source checked: 2026-11-13.	56 m	Municipality of Pisa
Washington MonumentHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Architectural height from lowest open-air pedestrian entrance to top; 2014 survey. Ground or specified base to the named top endpoint. Published value: 169.046 m. Publisher page reviewed 2026-11-13 NOAA Technical Report NOS NGS 51: architectural height 169.046 m. Source checked: 2026-11-13.	169.046 m	NOAA National Geodetic Survey
Empire State BuildingHeight, to the tipPublished dimension. See the measurement record for scope, date and conversions. Measurement record Overall height including antenna, not 381 m roof height. Ground or specified base to the named top endpoint. Published value: 443.2 m. Publisher page reviewed 2026-11-13 Height 1454 ft × 0.3048 = 443.1792 m, rounded to 0.1 m. Source checked: 2026-11-13.	443.2 m	Empire State Realty Trust
Burj KhalifaHeight828 m architectural height, including the spire. The silhouette is an illustrative elevation, not a construction drawing. Measurement record Architectural height including the spire, excluding technical equipment above it. Lowest significant open-air pedestrian entrance to architectural top; not the 829.8 m tip or highest occupied floor. Published value: 828 m. Completed building; operator and Skyscraper Center records accessed 2026-11-13 Emaar: 828 metres; Skyscraper Center: Height, Architectural. Source checked: 2026-11-13.	828 m	Emaar Skyscraper Center · height definitions
Taipei 101Height, to the tipPublished dimension. See the measurement record for scope, date and conversions. Measurement record Operator’s published overall tower height including spire; rounded to metres. Ground or specified base to the named top endpoint. Published value: 508 m. Publisher page reviewed 2026-11-13 How high is Taipei 101? 508 metres. Source checked: 2026-11-13.	508 m	Taipei 101
One World Trade CenterHeight, to the tipPublished dimension. See the measurement record for scope, date and conversions. Measurement record Architectural height including spire; not the 546.2 m technical tip. Ground or specified base to the named top endpoint. Published value: 541.3 m. Publisher page reviewed 2026-11-13 Height: Architectural, 541.3 m. Source checked: 2026-11-13.	541.3 m	Council on Tall Buildings and Urban Habitat
CN TowerHeight, to the tipPublished dimension. See the measurement record for scope, date and conversions. Measurement record Base to top of antenna. Ground or specified base to the named top endpoint. Published value: 553.33 m. Publisher page reviewed 2026-11-13 Common questions: How tall is the CN Tower? 553.33 metres. Source checked: 2026-11-13.	553.33 m	CN Tower
Space NeedleHeight, to the tipPublished dimension. See the measurement record for scope, date and conversions. Measurement record Ground to aircraft warning beacon. Ground or specified base to the named top endpoint. Published value: 184.4 m. Publisher page reviewed 2026-11-13 605 ft × 0.3048 = 184.404 m; rounded to 0.1 m. Source checked: 2026-11-13.	184.4 m	Space Needle
Gateway ArchHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Ground to arch top; operator’s published metre figure. Ground or specified base to the named top endpoint. Published value: 192 m. Publisher page reviewed 2026-11-13 630 feet (192 m), same height and outside width; rounding as published. Source checked: 2026-11-13.	192 m	US National Park Service
Arc de TriompheHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Ground to top of the monument. Ground or specified base to the named top endpoint. Published value: 50 m. Publisher page reviewed 2026-11-13 Services et conditions de visite: monument measures 50 metres. Source checked: 2026-11-13.	50 m	Centre des monuments nationaux
London EyeHeightPublished dimension. See the measurement record for scope, date and conversions. Measurement record Overall height above ground, including the highest pod; not wheel diameter. Ground or specified base to the named top endpoint. Published value: 135 m. Publisher page reviewed 2026-11-13 About the London Eye: How tall? 135 metres. Source checked: 2026-11-13.	135 m	London Eye / Merlin Entertainments
Golden Gate BridgeLengthPublished dimension. See the measurement record for scope, date and conversions. Measurement record Overall bridge length including approaches, abutment to abutment; not the main span. Extreme ends along the documented longitudinal axis. Published value: 2,737 m. Publisher page reviewed 2026-11-13 Length, Width, Height, Weight: 2737 m (8981 ft); metre precision as published. Source checked: 2026-11-13.	2.737 km	Golden Gate Bridge Highway and Transportation District
Statue of LibertyHeight, ground to torchPublished dimension. See the measurement record for scope, date and conversions. Measurement record Ground to torch tip, including foundation and pedestal. Ground beneath the foundation to the torch flame tip; includes 46.94 m of foundation and pedestal beneath the 46.05 m figure. Published value: 92.99 m. Publisher page reviewed 2026-11-13 Statue statistics: height from base to torch 92.99 m. Source checked: 2026-11-13.	92.99 m	US National Park Service
Christ the RedeemerHeight, including the pedestalPublished dimension. See the measurement record for scope, date and conversions. Measurement record 30 m statue plus 8 m pedestal. Ground beneath the 8 m pedestal to the top of the 30 m statue, a total of 38 m. Published value: 38 m. Publisher page reviewed 2026-11-13 Restauro Cristo 90 Anos: 38 m including the pedestal. Source checked: 2026-11-13.	38 m	Santuário Cristo Redentor

Typefaces

Sofia Sans Condensed and Onest, both under the SIL Open Font License.

Sources and credits

How sizes are chosen

Reference models and natural variation

Silhouettes and original artwork

Sharing artwork

Planets and moons

Artwork in version 1 challenges

Every object and its figure

Animals

Dinosaurs and prehistoric life

Planets and moons

Countries and states

Everyday objects

Sports

Vehicles and craft

Landmarks and towers

Typefaces