Allosaurus Size Comparison
Allosaurus 3D Viewer pairs published Late Jurassic theropod figures with a 1.8 m person on screen - length about 8.5 m average for A. fragilis (largest confirmed near 9.7 m), hip height about 3 m, and weight about 1.5-2.7 tonnes - so the scale gap stays readable at a glance.
Allosaurus published figures
The Allosaurus facts panel and this table disclose published ranges rather than one invented single number; the Size vs human control uses about 8.5 m as the length scale ratio:
| Measure | Figure | Vs a 1.8 m person |
|---|---|---|
| Length | about 8.5 m average; largest confirmed near 9.7 m; some sources cite a wider overall range of about 7.9-13.1 m; Size vs human uses about 8.5 m | ~4.7x a person end-to-end at the 8.5 m scale figure |
| Hip height | about 3 m (published ranges roughly 2.9-4.9 m) | ~1.7x to ~2.7x adult standing height |
| Weight | about 1.5-2.7 tonnes (often about 1.7 t average; large individuals up to about 2.3-2.7 t) | sources disagree by individual and study - shown as a range |
| When it lived | 155-143 million years ago | Late Jurassic (Oxfordian-Tithonian); mainly Morrison Formation, western United States; Othniel Charles Marsh named the genus in 1877 at Garden Park, Colorado; 2023 ICZN neotype USNM 4734 |
How the Allosaurus size-vs-human toggle stays honest
The Allosaurus 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 (about 8.5 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 an average near 8.5 m with largest confirmed near 9.7 m (and a wider overall range in some sources), so the toggle picks one clear scale inside that disclosed range.
What a person would see beside an Allosaurus
What a person would see is a bipedal theropod whose hip height (about 3 m) stands well above a 1.8 m adult, with small bony ridges above each eye and three clawed fingers on each hand - turn on the person in the viewer and orbit beside a hind leg to feel how the horizontal-back posture and raised counterweight tail sit relative to the scale figure. Skin and color are an artistic reconstruction, not a fossil-accurate skeleton.
What the Allosaurus size numbers are not
What these size numbers are not is a claim of one precise length or weight: the Allosaurus size comparison discloses the literature ranges and uses about 8.5 m only for the Size vs human scale; it does not invent a specific proven prey list, no free-licensed Allosaurus glTF is re-hosted yet so the viewer stays procedural, and this is not a win/lose game. For the control walkthrough see how to view Allosaurus in 3D. For trade-offs versus phone AR apps see Allosaurus 3D viewer vs AR apps.
Other dinosaurs to compare
Other dinosaurs in the collection make useful size comparisons too: Allosaurus is a Late Jurassic theropod, so for a Late Cretaceous apex predator see the Tyrannosaurus rex 3D Viewer, or for a sail-backed theropod see the Spinosaurus 3D Viewer.
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