Dinosaurs / Compare
Compare dinosaur sizes
Add up to six dinosaurs, then anything familiar for scale. Everything is drawn on one scale.
Tyrannosaurus Stegosaurus Adult human London double-decker bus
Drawn to one scale
1 m = 27.8 px
| Name | Length | Mass | Length vs Tyrannosaurus | Mass vs Tyrannosaurus |
|---|---|---|---|---|
| Tyrannosaurus | 12 m | 8.2 t | 1× | 1 |
| Stegosaurus | 8 m | 5.3 t | 0.65× | 0.6× |
| Adult human | 1.7 m | 70 kg | 0.14× | 0× |
| London double-decker bus | 11 m | 11 t | 0.9× | 1.3× |
How the comparison works
Length mode draws each outline at its estimated length on a shared metre scale, so a 12 m predator really is about as long as a double-decker bus. Mass mode swaps the outlines for blocks whose area is proportional to weight, which shows how much heavier the giants were than their length suggests. Ratios in the table are measured against the first item. Sizes are estimates; see about the sizes, or browse the explorer and records.