AT-AT Walker vs Optimus Prime: taller by how much?
An AT-AT walker measures 22.5 m (73.8 ft) from the ground up, and Optimus Prime measures 8.5 m (27.9 ft) from the ground up. Optimus Prime would have to grow by 165% to match an AT-AT walker, which is 2.65 times its height. Take 2 Optimus Primes stacked up and you reach 17 m (55.8 ft), still 5.5 m (18 ft) short of an AT-AT walker; one more would overshoot by 3 m (9.84 ft). An AT-AT walker is written in tens of metres and Optimus Prime in single metres, a whole band of scale apart.
| Object | Real size | Axis measured | What the figure covers |
|---|---|---|---|
| AT-AT Walker | 22.5 m 73.8 ft |
Height | Star Wars |
| Optimus Prime | 8.5 m 27.9 ft |
Height | Transformers |
Both figures, AT-AT Walker and Optimus Prime, come from the Size It Up measurement set, one real-world size and one measured axis per object, last checked in September 2026; outline provenance is listed on the sources page.
Why this one is hard to judge by eye
An AT-AT walker is drawn about 5.88 times as wide as Optimus Prime as well as 2.65 times its height, so the area it takes in the frame grows faster than the figure anyone quotes. An AT-AT walker sits in the range with no handy yardstick: too big to hold against anything you have carried, too small to need a horizon, so it and Optimus Prime end up filed under the same vague heading of very large. On the drawing above an AT-AT walker is about 1.30 times as wide as it is tall and Optimus Prime about 1.71 times as tall as it is wide, so the two outlines fill the frame in ways that have nothing to do with the one axis being compared.
What each figure covers
AT-AT Walker. The height is taken to the top of the hull rather than to the raised head, and it comes from the production design rather than from anything built at full size.
Optimus Prime. The height is the live-action film design. The animated original was quoted far smaller, and the two have almost nothing in common at scale.
An AT-AT walker and Optimus Prime are both quoted as a height, which is what makes the ratio above a like-for-like figure.
What else is about that size?
Measured the same way, AT-AT Walker at 22.5 m sits within a tenth of Mongo at 23 m and Oak Tree at 22 m. Optimus Prime at 8.5 m has AT-ST Walker at 8.6 m and TIE Fighter at 8.8 m for company, within a tenth. Swapping any of those in for an AT-AT walker would move its ratio to Optimus Prime by less than 10%.