1. A computer implemented method for determining dimensions of an unknown item, the method comprising: receiving a first image of the item captured by a first camera; identifying a first top corner of the item in the first image; determining a first point on a first reference plane that correlates to the identified first top corner; receiving a second image of the item captured by a second camera; identifying the first top corner of the item in the second image; determining a second point on a second reference plane that correlates to the identified first top corner in the second image; and determining a first dimension of the item using the first and second points and the location of the first and second cameras.