How Big Was a T-Rex?

The Tyrannosaurus Rex, often abbreviated as T-Rex, is one of the most well-known dinosaurs. Its fame has been fueled by its frequent appearances in pop culture, notably in movies such as Jurassic Park. But how big was a T-Rex really? This article will delve into the size of the T-Rex, providing an in-depth look at this iconic creature.

The Size of T-Rex

The T-Rex was one of the largest meat-eating dinosaurs that ever lived. An adult T-Rex could reach up to 40 feet in length, which is about as long as a school bus. In terms of height, they stood approximately 12 to 20 feet tall at the hips.

But the T-Rex wasn’t just long and tall. It was also incredibly massive, with estimates of its weight ranging from 5 to 9 tons. That’s about the same weight as an African elephant, one of the heaviest land animals alive today. The size of a T-Rex made it an imposing predator in its time.

T-Rex Skull and Teeth Size

A significant part of the T-Rex’s size was its head. The skull of a T-Rex was massive and powerfully built. A typical T-Rex skull measured up to 5 feet long. Inside this large skull, the T-Rex had quite a set of teeth. They had between 50 to 60 thick, conical teeth that were up to 9 inches long. These teeth were designed for crushing and ripping meat, making the T-Rex an efficient hunter.

T-Rex Footprint and Leg Size

The size of a T-Rex’s footprint was equally impressive. Based on fossil evidence, the footprints of a T-Rex were up to 1.7 feet long. This is roughly the same length as a human forearm. The large foot size indicates that the T-Rex had robust and strong legs, which were crucial for supporting its massive body weight.

Notable T-Rex Specimens

Several T-Rex specimens have been found that provide insight into their size. One of the largest and most complete T-Rex fossils ever discovered is “Sue,” a specimen housed at the Field Museum in Chicago. Sue measures 40 feet long and stands 13 feet tall at the hips, making her one of the largest T-Rexes ever discovered.

T-Rex Compared to Other Dinosaurs

While the T-Rex was undoubtedly large, it wasn’t the biggest dinosaur. Some herbivorous dinosaurs like Argentinosaurus and Patagotitan were significantly larger. However, when it comes to carnivorous dinosaurs, the T-Rex was one of the largest, surpassed only by Spinosaurus in terms of overall size.

T-Rex: A Real-Life Giant

So, how big was a T-Rex? In summary, this iconic dinosaur was one of the largest carnivores to ever walk the Earth. With a length of up to 40 feet, a height of 20 feet, and a weight of up to 9 tons, the T-Rex was a true giant. Its size, combined with its powerful jaws and sharp teeth, made it an apex predator in its time.

Despite its extinction millions of years ago, the T-Rex continues to captivate us with its size and power. Through ongoing research and fossil discoveries, we continue to learn more about this incredible dinosaur and its place in Earth’s history.


1. “Tyrannosaurus Rex.” National Geographic.
2. “T-Rex: The Ultimate Predator.” American Museum of Natural History.
3. “Sue the T. Rex.” Field Museum.
4. “How Big Was T-Rex?” Smithsonian National Museum of Natural History.

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