ERA Calculator
Type the earned runs and innings pitched, written the way box scores write them, and get the earned run average with every step of the sum shown.
Your rounds
One row per 18-hole round: the adjusted gross score, and the Course Rating and Slope Rating of the tees you played. PCC is the playing conditions adjustment shown by your golf association (0 on most days).
| # | Date | Score | Rating | Slope | PCC | Differential | Delete |
|---|
Course Handicap for the tees you play
Wins needed for a target
Games behind
Chart: score differentials
How to use the ERA calculator
Enter Earned runs and Innings pitched. Innings use baseball notation: 6.1 means six innings and one out, 6.2 means six innings and two outs, and 7 means seven full innings. A third out completes the inning, so 6.3 is not accepted. This earned run average calculator answers at once, with the conversion from innings to outs and the multiplication written out under it.
Add Hits allowed and Walks allowed to turn it into a WHIP calculator as well. Choose 9-inning games or 7-inning games: softball and many youth games are seven innings long, and some leagues scale ERA to that length, so pick the one your league reports. Copy result puts the numbers and the working on the clipboard, and Share link sends the same line to a teammate. Your figures are kept in this browser and nothing is uploaded.
Counting pitches during the game? The pitch counter tracks balls, strikes and innings pitched per pitcher, and the baseball scoreboard or softball scoreboard keeps the line score. For hitters, use the batting average calculator.
How the earned run average is worked out
The Official Baseball Rules (Rule 9.21(e)) say to multiply the earned runs by 9 and divide by the innings pitched, including fractions of an inning. Each out is one third of an inning (Rule 9.02(c)(1) comment), so the calculator turns 6.1 into 19 outs and 19 / 3 = 6.333 innings before dividing.
Worked example: 3 earned runs in 6.1 innings gives 9 x 3 / 6.333 = 4.26. With 5 hits and 2 walks allowed, WHIP = (2 + 5) / 6.333 = 1.11, the walks plus hits per inning pitched. Set to 7-inning games, the same line is 7 x 3 / 6.333 = 3.32. The rulebook's own example, 3 earned runs in 9 1/3 innings (type 9.1), gives 2.89, and so does this page.
Only earned runs belong in the first box. Runs that scored because of an error or a passed ball are unearned and stay out. When nobody has been retired yet (0 innings) the ERA has no value, because you cannot divide by zero; with runs on the board it is, mathematically, infinite.
Keyboard shortcuts
- 9: 9-inning games
- 7: 7-inning games
- U or Ctrl+Z: undo the last change
- R: clear every box (Undo brings it back)
- C: copy the result
- Esc leaves a box so the keys above work
- F: full screen
Questions
How do I enter one third of an inning?
Write .1 after the full innings, for example 5.1 for five and one third. Two thirds is .2. This is the usual way innings pitched are written; the calculator converts it to outs before dividing.
What is a good ERA?
It depends on the level and the season, so this page does not set a benchmark. Lower is better: an ERA of 3.00 means three earned runs allowed per nine innings.
Why choose 7-inning games?
ERA is normally scaled to the length of a game. For games that are seven innings long, such as softball and many youth leagues, multiplying by 7 shows runs per game. Use whichever your league reports.
What does WHIP count?
Walks plus hits, divided by innings pitched. Hit batters, errors and fielder's choices are not part of it, so leave them out of both boxes.
More in Stats calculators
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