Batting average on balls in play

[2] It can be expressed as, "when you hit the ball and it’s not a home run, what’s your batting average?

BABIP is computed per the following equation, where H is hits, HR is home runs, AB is at bats, K is strikeouts, and SF is sacrifice flies.

In Major League Baseball (MLB), .300 is considered an average BABIP.

[2] Various factors can impact BABIP, such as a player's home ballpark;[3] for batters, being speedy enough to reach base on infield hits;[3] or, for pitchers, the quality of their team's defense.

As with other statistical measures, those pitchers whose BABIPs are extremely high (bad) can often be expected to improve in the following season, and those pitchers whose BABIPs are extremely low (good) can often be expected to worsen in the following season.