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Spinosaurus size comparison
The longest predatory dinosaur, drawn to scale. Add or remove animals and objects to see how the 15-metre sail-back really measures up.
Quick answer
At up to 15 metres (49 ft), Spinosaurus was the longest predatory dinosaur ever found, longer than T. rex (~12 m), Giganotosaurus (~13 m) and a school bus, more than eight times the length of a person, and beaten only by fully aquatic giants like the blue whale.
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Drawn to scale. Lengths are best-estimate midpoints; many are known from partial fossils.
How does Spinosaurus compare in size?
Spinosaurus reached about 15 metres long, the longest predatory dinosaur known. That is longer than Tyrannosaurus rex (~12 m), Giganotosaurus (~13 m) and Carcharodontosaurus (~12.5 m). It is dwarfed only by fully aquatic giants like the blue whale (~25 m).
Is Spinosaurus bigger than a blue whale?
No. A blue whale reaches around 25 to 30 metres, far longer and vastly heavier than Spinosaurus at about 15 metres. Spinosaurus was the largest predatory dinosaur, but not the largest animal.
How big is Spinosaurus compared to a human?
Enormous. A person stands about 1.8 metres tall, while Spinosaurus stretched to roughly 15 metres, more than eight times longer, and weighed around 7 tonnes.