How Big Was Allosaurus?

The world of dinosaurs has always been a subject of fascination and intrigue, with the Allosaurus standing as one of its most intriguing figures. The size of Allosaurus, its height, weight, and length have all been topics of great interest among paleontologists and dinosaur enthusiasts alike. So, how big was Allosaurus? Let’s delve into the depths of prehistoric times to find out.

A Glimpse at Allosaurus

Allosaurus, meaning “different lizard,” was a carnivorous dinosaur that lived during the late Jurassic period, approximately 150 to 155 million years ago. This allosauras was one of the most common predators of its time, roaming what is now North America and possibly Europe.

The Size of Allosaurus

The size of Allosaurus has been a subject of many studies. Most estimates suggest that adult Allosaurus were typically around 8.5 to 12 meters (28 to 39 feet) in length. However, some exceptional individuals may have grown up to 13 meters (43 feet) long. As for the allosaurus height, it stood about 4.5 to 5 meters (14.7 to 16.4 feet) tall at the hips.

Allosaurus Weight

Estimating the weight of a dinosaur like Allosaurus is a challenging task due to the lack of complete fossils. Nonetheless, most paleontologists agree that a fully grown Allosaurus could weigh between 2 to 3 tons. Some larger specimens might have reached weights of up to 4 tons.

Allosaurus Size Comparison

To help visualize the size of Allosaurus, it’s helpful to compare it to something more familiar. An adult Allosaurus was roughly equivalent in length to a school bus and stood as tall as an elephant at the hips. This dinosaur was indeed a formidable creature.

Allosaurus Speed

Despite its massive size, Allosaurus was likely quite agile. Its long, powerful hind limbs suggest that it could reach speeds of up to 20 miles per hour when chasing prey.

Allosaurus Diet: Carnivore or Herbivore?

Allosaurus was undoubtedly a carnivore. It had a large skull filled with sharp, serrated teeth perfect for tearing into flesh. Its strong arms ended in three-fingered hands with large, curved claws, which it likely used to grasp prey.

Allosaurus Predators

As one of the top predators of its time, Allosaurus didn’t have many threats. However, larger theropods like Torvosaurus could have posed a danger, especially to younger or injured individuals.

Discovery of Allosaurus

The first Allosaurus fossil was discovered in the late 19th century. In 1877, Othniel Charles Marsh, a prominent paleontologist, described and named the dinosaur. Since then, numerous other Allosaurus fossils have been found, providing us with a wealth of information about this fascinating creature.


In conclusion, the Allosaurus was a truly impressive dinosaur. Its size, height, weight, and speed all contribute to its reputation as one of the most fearsome predators of the Jurassic period. The next time you find yourself wondering, “How big was the Allosaurus?” or “What is an Allosaurus?”, remember this carnivorous giant that once roamed our planet.

Whether you’re a seasoned paleontologist or a curious enthusiast, there’s always more to discover about these fascinating creatures. So keep exploring, keep asking questions, and keep delving into the captivating world of dinosaurs like the Allosaurus.

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