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Prehistoric Life

How long was Apatosaurus louisae?

An adult Apatosaurus louisae had a body length of about 22 m (72 ft).

What is measured: adult body length

Apatosaurus louisae (22 m) drawn to scale beside a city bus (12 m) and the Statue of Liberty (93 m)
Drawn to scale, from left to right: City bus (12 m), Apatosaurus louisae (22 m) and Statue of Liberty (93 m).

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How big is that, really?

  • About the same length as a tennis court
  • About 1.8× as long as a city bus
  • About 2 would fit end to end along an Olympic swimming pool
  • As long as about 4 20-foot shipping containers end to end
  • About 4 would fit end to end along a football (soccer) pitch

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Facts about Apatosaurus louisae

Apatosaurus had unusually robust neck vertebrae and a deep, heavy body compared with many other long-necked dinosaurs.

Source: Carnegie Museum of Natural History, Apatosaurus louisae; American Museum of Natural History, Apatosaurus

Prehistoric Life

NameSizeCompared with Apatosaurus louisae
Brachiosaurus altithorax13 m (43 ft)0.59×
Titanoboa cerrejonensis13 m (43 ft)0.59×
Livyatan melvillei13.5 m (44 ft)0.61×
Giraffatitan brancai13.5 m (44 ft)0.61×
Basilosaurus cetoides18 m (59 ft)0.82×
Sauroposeidon proteles18 m (59 ft)0.82×
Mamenchisaurus hochuanensis22 m (72 ft)same size
Apatosaurus louisae22 m (72 ft)this page
Dreadnoughtus schrani26 m (85 ft)1.2×
Lepidodendron30 m (98 ft)1.4×

Test your sense of scale

Which is bigger: Apatosaurus louisae or Basilosaurus cetoides?

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