Handy Dinosaur Stats
You may find that other sources, such as the books listed in the bibliography, disagree with the measurements in the following lists and charts. For example, some authorities give the length of a Tyrannosaurus as fifty feet (15.2 meters) which we believe is possible, while others give a figure fifteen feet (4.5 meters) shorter. There are at least two reasons:

1. Dinosaur specimens within the same species varied significantly in height, length, and weight; therefore, how “big” a dinosaur was depends on which individual or group you are talking about.

2. Height and weight are especially subjective, because they are educated guesses. In addition, many sources give height as “at the shoulder,” rather than to the top of head. Our measurements are from the ground to the top of the head -- the greatest height the dinosaur could reach while fighting or eating.

Comparing the height of sauropods with other species is somewhat deceptive, because the sauropods walked on all fours. Their amazing sizes show in their length and weight. (Exceptions to this were Seismosaurus and Argentinasaurus, which were long, heavy and tall!)