The center of gravity of an object is a theoretical point which identifies its effective location. It is roughly the three-dimensional average of the positions of all protons and neutrons in the object.

An easier way to identify the location of the center of gravity is by suspending a non-central part of the object in place, while allowing it to spin sufficiently on any axis. Once it comes to rest, the center of gravity lies along the line containing the suspended point and with the direction of the gravitational force vector. By performing this process from two or more points of suspension, the center of gravity can be isolated as a point.

In many physical calculations, the center of gravity can be used to represent the position of the entire object, so long as the object's spin, etc. are not concerned.

If the object has a simple geometric shape, with its mass evenly distributed (unweighted dice, a baseball), the center of gravity will lie at the geometric center of the object.