# Angular momentum of a set of particles

Given a set of point masses of known mass with known positions and velocity, what is the best way to calculate the angular momentum of the entire system?

The angular momentum of a single point mass is the cross product of the position vector $\vec r$ and the momentum of the point mass, however the position vector $\vec r$ can be chosen arbitrarily for a single point mass. When concerned with a set of point masses, should I select the center of mass as the origin for the position vector?

• – sammy gerbil Oct 29 '16 at 16:29