Tyrannosaurus Rex vs Spinosaurus Size Comparison

A spinosaurus is 5 ft 7 in (170 cm) longer than a T. rex: 46 ft (14 m) against 40 ft (12.3 m).

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Which is bigger, a T. rex or a spinosaurus?

A spinosaurus is bigger. A spinosaurus is 5 ft 7 in (170 cm) longer than a T. rex. That makes a spinosaurus 1.1× the size of a T. rex.

That makes a spinosaurus 1.1× the size of a T. rex. Volume grows with the cube of length, which is why the volume number is so much bigger.

Sizes are typical adult or reported values, rounded for readability. Read how we measure and compare sizes.

Silhouettes from PhyloPic: Tyrannosaurus rex by JFstudios; Spinosaurus by Rhiannon Dixon. See credits.