ERA and WHIP calculator
Enter a pitcher’s innings pitched, earned runs, hits and walks and the calculator works out ERA and WHIP, for baseball or softball. Nothing is saved or sent.
Innings are written in outs: 5.2 is five innings and two outs.
- ERA over 9
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- WHIP
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Earned run average (ERA)
ERA is the number of earned runs a pitcher would allow over a full game: earned runs times 9, divided by innings pitched. A pitcher who allows 6 earned runs in 27 innings has a 2.00 ERA.
A regulation softball game is 7 innings, so softball ERA is worked out over 7, not 9. The same 6 earned runs in 27 innings make a 1.56 ERA in softball. The calculator changes the base when you pick the sport.
Only earned runs count: the ones that would have scored without fielding errors or passed balls. A run that scores because of an error is unearned and does not raise the pitcher’s ERA.
How innings are written
Innings pitched are counted in outs. Each out is a third of an inning, and the sheet writes .1 for one out and .2 for two: 5.2 is five innings and two outs, or 17 outs.
That is why 5.3 does not exist: the third out completes the sixth inning and is written 6.0. The calculator refuses any other fraction, just like the RosterMetrix scoresheet.
WHIP
WHIP counts how many base runners a pitcher allows per inning: walks plus hits, divided by innings pitched. A 1.00 WHIP is one runner an inning, which is excellent in professional baseball.
Unlike ERA, WHIP does not depend on the defense or on luck with runners on base: it measures what the pitcher controls directly. That is why the two are read together.
In your league, without a calculator
On RosterMetrix each game’s pitching is loaded once and, when the commissioner approves it, every pitcher’s ERA, WHIP, strikeouts per game and record update on their own, over the 9 or 7 innings the league’s rules set.
On RosterMetrix each manager loads their team’s sheet, the commissioner approves the game, and averages, ERA, the leaders and every player’s page update on their own.