How Big is a T-Rex Tooth
The size of a T Rex tooth differs. Some of them are quite small, but others can reach lengths of 9 inches (23 cm). One T Rex specimen found had 13 inch teeth. All its teeth are thick and have a conical shape. Each T Rex had between 50 to 60 teeth.
More Information about T Rex Teeth and Jaws
The teeth shape and thickness suggests that they were used for ripping meat and crushing bones. The adult T Rex had teeth of varying sizes. It is also clear that the broken ones were replaced.
Its jaws had been 4 feet long. The size of a T Rex tooth and jaws meant it was capable of eating over 500 lbs (230 kg) of bones and meat with a single bite.
It is also worth noting that T Rex possessed a wrap around overbite. When the creature closed its mouth, the lower jaw’s upper parts were covered by the inner upper teeth.
Other Physical Characteristics
T Rex walked on two hind legs. An important point to remember is that T Rex did not walk upright all the time as shown in many movies. This would not have been possible owing to its large head.
In contrast to the oversized head and jaws, its arms were very small, with two fingers. Its feet resembled those of birds, and had three toes. 
The tail was long and stiff. It was probably used to counterbalance the enormous weight of its head. The tail also made it possible for the creature to turn around quickly. Its bones number more or less 200. They were however, hollow. Its neck was long and muscular.
Size
The average adult T Rex was 15 to 20 feet (4.6 to 6 m) tall and 40 feet (12.4 m) long. Its arms were 3 feet (1 m) long. Again it is in sharp contrast to the rest of the body. Its weight ranged from 5 to 7 tons.
The eye sockets in the skull are 4 inches (10.2 cm) long. The whole skull is nearly 5 feet long. Its eyeballs probably had a diameter of 3 inches (7.6 cm). Its footprints were 1.55 feet (46 cm) long. T Rex walked on its toes, so its feet were in fact a meter (3.3 ft) long.
The size of a T Rex tooth suggests it consumed a lot of meat and bones. But whether it hunted or scavenged for food is still being debated. What is known is that a significant portion of its brain was dedicated to tracking odors.
