What it is

Completion percentage is the share of a quarterback’s passes that are caught by a teammate. You get it by dividing completions by attempts.

In a game

A quarterback who completes 20 of 30 passes has a completion percentage of 67 percent. The higher it is, the more accurate or the safer his passing.

More detail

Short throws raise it, while deep ones lower it, so it is not the whole story. A quarterback who throws many checkdowns can have a good percentage with few yards.