Compare dinosaurs

Pick two dinosaurs to see them side by side. Ranges are shown as published; missing values say Unknown.

First dinosaur

Second dinosaur

Drawn to one scale, overlapping on a shared ground line, with a 1.8 m human on the right. Allosaurus fragilis: 8.5 m long · 2.1 m hip height. Tyrannosaurus rex: 12.3 m long · 3.9 m hip height. Allosaurus fragilis is 0.7× the length of Tyrannosaurus rex.Silhouettes: Allosaurus fragilis · Tasman Dixon, CC0 1.0, via PhyloPic · CC0 1.0; Tyrannosaurus rex · Emily Willoughby, CC BY-SA 3.0, via PhyloPic · CC BY-SA 3.0; Human · Cagri CEVRIM · CC0 1.0

Fred Wierum, CC BY-SA 4.0, via Wikimedia Commons (unmodified except resizing) · CC BY-SA 4.0

Allosaurus fragilis

Period: Jurassic· Kimmeridgian
Age: 154.8–145 Ma
Diet: Carnivore
Length: 8.5 m
Height: 1.9–2.4 m
Mass: 1.5–1.7 t
Found in: Morrison Formation, Colorado, Utah, United States
Classification: Dinosauria › Saurischia › Theropoda › Tetanurae › Allosauroidea › Allosauridae › Allosaurus › Allosaurus fragilis
Year described: 1877

Connor Ashbridge, CC BY 4.0, via Wikimedia Commons · CC BY 4.0

Tyrannosaurus rex

Period: Cretaceous· Maastrichtian
Age: 68–66 Ma
Diet: Carnivore
Length: 12.3–13 m
Height: 3.6–4 m
Mass: 6–9.5 t
Found in: Hell Creek Formation, Lance Formation, Scollard Formation, Frenchman Formation, Montana, South Dakota, North Dakota, Wyoming, Alberta, Saskatchewan
Classification: Dinosauria › Saurischia › Theropoda › Coelurosauria › Tyrannosauroidea › Tyrannosauridae › Tyrannosaurinae › Tyrannosaurus › Tyrannosaurus rex
Year described: 1905