Pachycephalosaurus Size Comparison
Pachycephalosaurus 3D Viewer pairs published Late Cretaceous dome-headed figures with a 1.8 m person on screen - length about 4.5 m (Britannica cites up to roughly 5 m; Size vs human uses 4.5 m) and weight about 370-450 kg - so the scale gap stays readable at a glance.
Pachycephalosaurus published figures
The Pachycephalosaurus facts panel and this table disclose published ranges rather than one invented single number; the Size vs human control uses 4.5 m as the length scale ratio:
| Measure | Figure | Vs a 1.8 m person |
|---|---|---|
| Length | about 4.5 m; Britannica cites up to roughly 5 m; Size vs human uses 4.5 m | ~2.5x a person end-to-end at the 4.5 m scale figure |
| Weight | about 370-450 kg | sources disagree by individual - shown as a range |
| Signature anatomy | skull dome up to about 22 cm thick (~20x thicker than most dinosaur skull roofs); function debated (ramming, flank-butting, or display); diet uncertain | dome is clickable on the head mesh; no settled head-butting claim |
| When it lived | 70-66 million years ago (Late Cretaceous, Maastrichtian), Montana, South Dakota, Wyoming, and Alberta | named 1931 by Gilmore (first as Troodon species); genus erected 1943 by Brown and Schlaikjer |
How the Pachycephalosaurus size-vs-human toggle stays honest
The Pachycephalosaurus model is drawn to a fixed on-screen length so it fits the canvas; the Size vs human control then places a 1.8 m person at the true length ratio used by the viewer (4.5 m). Tap Size vs human under the canvas to show or hide the scale figure - the comparison is proportional, not a decorative sticker. Published length still spans about 4.5 m with Britannica up to roughly 5 m, so the toggle picks one clear scale inside that disclosed range.
What a person would see beside a Pachycephalosaurus
What a person would see is a bipedal Late Cretaceous dinosaur with a thickened bony skull dome - turn on the person in the viewer and orbit beside a hind leg to feel how the body sits relative to the scale figure. Skin color is an artistic reconstruction; the viewer does not invent a settled dome function or diet.
What the Pachycephalosaurus size numbers are not
What these size numbers are not is a claim of one precise length or weight: the Pachycephalosaurus size comparison discloses the about 4.5-5 m and 370-450 kg ranges and uses 4.5 m only for the Size vs human scale; it does not invent a hip-height figure the skill does not carry, does not invent a settled dome function or diet, no free-licensed Pachycephalosaurus glTF is re-hosted yet so the viewer stays procedural with skullDome, and this is not a win/lose game. For the control walkthrough see how to view Pachycephalosaurus in 3D. For trade-offs versus phone AR apps see Pachycephalosaurus 3D viewer vs AR apps.
Other dinosaurs to compare
Other dinosaurs in the collection make useful size comparisons too: Pachycephalosaurus shared Late Cretaceous North America with apex predators and horned giants, so for a larger contemporary apex predator see the Tyrannosaurus rex 3D Viewer, or for a frilled contemporary see the Triceratops 3D Viewer.
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