The wall of Capella is low but relatively thick and irregular, with a large promontory intruding on the south-eastern side.

The crater is crossed by a deep rift, the Vallis Capella, which passes directly through Capella from the north rim through the southeast side of the wall, and extends out both sides for a combined distance of 110 kilometers.

In the middle of the crater is a wide, round peak with a craterlet at the top.

The western side of the crater is dotted with impact debris, forming clusters of small hills.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Capella.