Pachycephalosaurus Size

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Pachycephalosaurus Size

It can be difficult to estimate the size and weight of any extinct animal such as Pachycephalosaurus, particularly when relatively few fossils specimens have been found (as is the case with Pachycephalosaurus).

The reasons why this may be the case include:
  1. If we only have a few fossils, we don't know whether they fairly represent typical animals.

  2. Fossil specimens are often incomplete.

  3. There can be some doubt about how to reassemble fossil skeletions

  4. Fossils usually preserve only bones, horns, and teeth - at most - so estimates of muscle and other soft-flesh are often speculative.
With these caveats, we can offer these estimates for an adult Pachycephalosaurus:
  • An adult Pachycephalosaurus would have been upto 15 feet (4.5 meters) long.

  • The bony dome on the animal's skull was about 10 inches (25 centimeters) thick.

  • An adult Pachycephalosaurus would weighed upto 950 pounds (430 kilograms).
Size comparison between the dinosaurs which lived in North America in the late Cretaceous
Scale in meters
(Pachycephalosaurus is middle-row center):
Dinosaur size comparison

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