Quick answer
The measurable difference
A very large T. rex is about 7.4 human heights long and more than 120 times heavier than the 70 kg ScaleCheck reference person.
Why this matchup matters
Different bodies, not just different numbers
Museum skeletons can hide scale because visitors stand below a mounted frame. Putting both subjects on the same floor restores the animal's actual body volume.
Human scale
How the gap feels
The dinosaur's hips sit around 4 m high. A person would look toward the lower torso, while the skull could be almost as long as the person is tall.
Evidence boundary
What the comparison cannot prove
This compares body length with standing human height, two different orientations. The visual scene is more informative than treating the 7.4 ratio as a height claim.