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Prehistoric Life

How long was Allosaurus fragilis?

An adult Allosaurus fragilis had a body length of about 9.7 m (32 ft).

What is measured: adult body length

Allosaurus fragilis (9.7 m) drawn to scale beside a 20-foot shipping container (6.06 m) and a city bus (12 m)
Drawn to scale, from left to right: Shipping container (20 ft) (6.06 m), Allosaurus fragilis (9.7 m) and City bus (12 m).

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How big is that, really?

  • A little shorter than a city bus
  • About 1.6× as long as a 20-foot shipping container
  • About 2 would fit end to end along a tennis court
  • About 5 would fit end to end along an Olympic swimming pool
  • About 4.9× the height of a doorway

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Facts about Allosaurus fragilis

Allosaurus had paired horn-like projections above its eyes and relatively short, three-fingered forelimbs.

Source: Utah Geological Survey, Allosaurus; Smithsonian National Museum of Natural History, Allosaurus

Prehistoric Life

NameSizeCompared with Allosaurus fragilis
Nigersaurus taqueti9 m (30 ft)0.93×
Albertosaurus sarcophagus9 m (30 ft)0.93×
Parasaurolophus walkeri9.5 m (31 ft)0.98×
Allosaurus fragilis9.7 m (32 ft)this page
Therizinosaurus cheloniformis10 m (33 ft)1×
Hatzegopteryx thambema10 m (33 ft)1×
Amargasaurus cazaui10 m (33 ft)1×
Tarbosaurus bataar10 m (33 ft)1×
Elasmosaurus platyurus10.3 m (34 ft)1.1×
Kronosaurus queenslandicus10.5 m (34 ft)1.1×

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