Walks plus hits per inning pitched

In baseball statistics, walks plus hits per inning pitched (WHIP) is a sabermetric measurement of the number of baserunners a pitcher has allowed per inning pitched. WHIP is calculated by adding the number of walks and hits allowed and dividing this sum by the number of innings pitched.

${\displaystyle WHIP={\frac {BB+H}{IP}}}$

WHIP reflects a pitcher's propensity for allowing batters to reach base, therefore a lower WHIP indicates better performance.

While earned run average (ERA) measures the runs a pitcher gives up, WHIP more directly measures a pitcher's effectiveness against batters. Like ERA, WHIP accounts for pitcher performance regardless of errors and unearned runs.