What counts as an official at bat?

Definition. An official at-bat comes when a batter reaches base via a fielder's choice, hit or an error (not including catcher's interference) or when a batter is put out on a non-sacrifice. (Whereas a plate appearance refers to each completed turn batting, regardless of the result.)

What is not an at bat?

Batters will not receive credit for an at bat if their plate appearances end under the following circumstances: They receive a base on balls (BB). They are hit by a pitch (HBP). They hit a sacrifice fly or a sacrifice bunt (also known as sacrifice hit).