Mamenchisaurus Size Comparison
Mamenchisaurus 3D Viewer pairs published figures for M. hochuanensis with a 1.8 m person - length about 18 m, neck over 9 m, and mass about 11.8 t - so the extreme neck-to-body scale gap stays readable at a glance.
Mamenchisaurus published figures
The Mamenchisaurus facts panel and this table use the same real published measures for M. hochuanensis, with M. youngi and M. sinocanadorum kept as separate tiers:
| Measure | Figure | Vs a 1.8 m person |
|---|---|---|
| Length | about 18 m (M. hochuanensis reference; Size vs human uses 18 m) | ~10x a person end-to-end at the 18 m scale figure |
| Neck | over 9 m in M. hochuanensis - roughly half total body length | ~5x a person end-to-end for the neck alone at the 9+ m figure |
| Height | about 5.5 m (panel silhouette) | ~3.1x adult standing height |
| Weight | about 11.8 t / 11800 kg (M. hochuanensis) | many times a human body mass at the panel baseline |
| When it lived | 160-145 million years ago | Late Jurassic; Sichuan and Yunnan, China; Young 1954; Herbivore |
| Second species (separate) | M. youngi about 16 m long with neck about 6.5 m - corroborating evidence, kept separate from headline figures | not blended into the M. hochuanensis panel numbers |
| Record-neck caveat (separate) | M. sinocanadorum neck up to about 15 m from fragmentary bones only; CT scan found 69-77 percent air in neck-vertebra bone volume - never blended with the 18 m / 11.8 t headline figures; does NOT use extrapolated 22-35 m / 50-75 t genus-wide extremes | kept as a separate, separately-sourced fact tier |
How the Mamenchisaurus size-vs-human toggle stays honest
The Mamenchisaurus 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 to the catalogue about 18 m panel baseline. Tap Size vs human under the canvas to show or hide the scale figure - the comparison is proportional, not a decorative sticker.
What a person would see beside a Mamenchisaurus
What a person would see is an extreme-neck sauropod whose panel length is about 18 m - ten person-lengths end to end - with a neck over 9 m alone and standing height about 5.5 m in the panel silhouette. Turn on Size vs human and orbit beside a hind leg to feel how half the body being neck compares to you.
What the Mamenchisaurus size numbers are not
What these size numbers are not is a blended composite: the M. hochuanensis headline figures (18 m / 11.8 t / 9+ m neck) are never merged with the M. sinocanadorum record-neck figure (about 15 m from fragmentary bones only) or with extrapolated genus-wide 22-35 m / 50-75 t extremes. M. youngi (about 16 m / 6.5 m neck) stays corroborating and separate. Soft-tissue color in the viewer is still an artistic reconstruction. This model is not a fossil-accurate skeleton. For the control walkthrough see how to view Mamenchisaurus in 3D. For trade-offs versus phone AR apps see Mamenchisaurus 3D viewer vs AR apps.
Why trust these tools
- Ten-plus years of web tooling. The freetoolonline editorial team has shipped browser-based utilities since 2015. The goal has never changed: get you to a working output fast, without an install.
- No install, no sign-up. Open a tool and get a working output in seconds - nothing to download and no account to create. Tools that need heavy processing run it on our service, so even a low-powered machine gets the job done.
- Analytics stops at the page view. We measure which pages get visited, not what you type or upload inside a tool. There is nothing to sign in to and no profile is attached to your input.
- Open-source core components. The processing engines underneath (libheif, libde265, pdf-lib, terser, clean-css, ffmpeg.wasm, and others) are public and audit-able. We link to each one in its tool page's footer.
- Free, with or without ads. All tools are fully functional without sign-up. The Disable Ads button in the header is always available if you need a distraction-free run.