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How Big Is an Allosaurus?

An allosaurus is about 31 ft (9.5 m) long. That is about 5.6 times as long as the average man is tall. The top predator of the Late Jurassic.

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How big is an allosaurus compared to the average man?

An allosaurus is about 5.6 times as long as the average man is tall. An allosaurus is 5.6× the size of the average man: about 5.6 average men lined up would match it. By volume, about 36 average men would fit inside an allosaurus.

Allosaurus length in feet, inches, centimeters and meters

An allosaurus measures:

Unit	Value
Feet and inches	31 ft 2 in
Inches	374 in
Centimeters	950 cm
Meters	9.5 m

Allosaurus size facts

Allosaurus was about 8.5 to 9.7 meters long.
It lived about 150 million years ago.

How does an allosaurus compare to other things?

An allosaurus next to 24 things of similar size, plus some everyday references:

Thing	Size	Compared to Allosaurus
Sun	865,000 miles (1,393,000 km) across	147 million× bigger
Earth	7,920 miles (12,740 km) across	1.34 million× bigger
Mount Everest	5.5 miles (8.849 km)	931× bigger
Eiffel Tower	1,083 ft (330 m)	34.7× bigger
Giganotosaurus	41 ft (12.5 m) long	9 ft 10 in (3 m) bigger
Tyrannosaurus rex	40 ft (12.3 m) long	9 ft 2 in (280 cm) bigger
School bus	40 ft (12.2 m) long	8 ft 10 in (270 cm) bigger
Whale shark	39 ft (12 m) long	8 ft 2 in (250 cm) bigger
Giant squid	39 ft (12 m) long	8 ft 2 in (250 cm) bigger
Fire truck	39 ft (12 m) long	8 ft 2 in (250 cm) bigger
Iguanodon	33 ft (10 m) long	1 ft 7.5 in (50 cm) bigger
Therizinosaurus	33 ft (10 m) long	1 ft 7.5 in (50 cm) bigger
Parasaurolophus	31 ft (9.5 m) long	0 pm smaller
Stegosaurus	30 ft (9 m) long	1 ft 7.5 in (50 cm) smaller
Triceratops	28 ft (8.5 m) long	3 ft 3 in (100 cm) smaller
Basking shark	26 ft (8 m) long	4 ft 11 in (150 cm) smaller
Carnotaurus	26 ft (8 m) long	4 ft 11 in (150 cm) smaller
Two-story house	26 ft (8 m)	4 ft 11 in (150 cm) smaller
Orca	25 ft (7.5 m) long	6 ft 7 in (200 cm) smaller
Stonehenge	24 ft (7.3 m)	7 ft 3 in (220 cm) smaller
Ankylosaurus	23 ft (7 m) long	8 ft 2 in (250 cm) smaller
Dilophosaurus	23 ft (7 m) long	8 ft 2 in (250 cm) smaller
Average man (world)	5 ft 7 in (171 cm)	5.6× smaller
Average woman (world)	5 ft 3 in (159 cm)	6× smaller

Where do these numbers come from?

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

Silhouettes from PhyloPic: Allosaurus by Rhiannon Dixon. See credits.