How do you calculate ERA?

Earned runs divided by innings pitched, times the selected regulation length. For example, 12 earned runs in 32.0 innings is 96 outs: 12 divided by 32 is 0.375 earned runs an inning, and times nine that is 3.375, shown as 3.38. The result uses two decimals and shows more digits when the value needs rounding.

What does 6.1 innings mean?

Six innings and one out, which is 19 outs. The digit after the point counts outs rather than tenths, so .1 is one out and .2 is two, and there is no .3 because three outs end the inning. The difference is not cosmetic: three earned runs in 6.1 innings is 4.26, while treating 6.1 as a decimal gives 4.43. That is why this page shows the out count next to the average.

How do you calculate ERA for softball or a seven-inning game?

Select 7 innings under Regulation length to calculate earned runs per seven innings. With 12 earned runs in 32.0 innings, the seven-inning ERA is 2.63, compared with 3.38 on the nine-inning scale. Innings pitched is the pitcher's actual innings, separate from the scale. Use the scale specified for the statistic you are calculating; the length of a single outing does not set it.

Can I calculate an MLB pitcher's ERA?

Yes. Enter the pitcher's earned runs and innings pitched from a box score, then select 9 innings. You can use totals for an outing or a season. This page calculates from your entries; it does not look up players, teams or current statistics.

Can I enter outs instead of innings?

Yes. Set Entered as to Outs and give the out count, so 19 rather than 6.1, which suits a partial outing you counted in outs. The page converts it back and shows 6.1 in the Innings cell, so both readings are on screen together, and switching between the two carries the figure across instead of clearing it. Thirds written as fractions read too, so 6 1/3 is the same as 6.1.

What happens if I type 6.5 innings?

It is refused, and the message says what to write instead. Innings notation only uses .0, .1 and .2, for no outs, one out and two outs, so 6.5 is not a figure this page will guess at: reading it as six and a half innings would be a different convention, and nothing is rounded or cut behind your back. Decimal thirds are caught the same way, so 6.33 and 6.67 are pointed back at 6.1 and 6.2.

What counts as an earned run?

Use the earned runs charged to the pitcher in the official box score. The scorer determines that total; this calculator cannot reconstruct it from a run total or a play-by-play. Enter earned runs rather than every run allowed, along with the innings pitched or outs credited to that pitcher.

This page does not grade the number, because what counts as good depends on the level, the park and the season, none of which a calculator knows. What the figure means is fixed: it is the earned runs given up per regulation game, so a lower ERA is fewer earned runs over the same innings. A 3.38 says the 12 earned runs and 96 outs entered work out at 3.38 earned runs per nine innings.

Is anything uploaded?

No. The arithmetic runs in your browser, nothing is sent anywhere and no figure you type reaches a server. The line you last worked on is remembered in your own browser storage so the page opens where you left it, and clearing your browsing data clears it. Copy puts the ERA and the line it came from on the clipboard as plain text, ready for a message or a scorebook note.

ERA Calculator

Calculate a pitcher's earned run average from earned runs and innings pitched or outs. Innings notation counts outs: 6.1 is six innings and one out, or 19 outs. Choose nine innings for baseball or seven for softball, and see the converted out count beside the result. The default example is 12 earned runs in 32 innings; your browser can restore your last entry.

ERA3.3812 earned runs · 32.0 innings (96 outs) · 9 inning scaleNine innings is baseball's regulation length.

ERA

3.38

Earned runs

Innings

Outs

Entered as

Regulation length

12 ER, 32.0 innings9 inning scale
3.38
32.0 inningsnotation read
96 outs, ERA 3.38
7 inning scalesame line
2.63

12 earned runs divided by 32.000 innings pitched, times 9 innings of regulation, is 3.375, shown as 3.38. Innings pitched is 96 outs divided by 3.

The exact figure is 3.375; the page shows two decimals, the way a box score does.

Earned runs per inning pitched: 0.375, before the 9 inning scale.

Accuracy. Exact arithmetic: earned runs divided by innings pitched, times the regulation length you choose. Baseball notation is read the way it is written, so 32.2 means 32 innings and 2 outs, which is 98 outs, and the page shows the converted outs so you can check it.

How to write the innings

Innings go in the notation a box score prints: 6 or 6.0 for six full innings, 6.1 for six and one out, 6.2 for six and two outs. Thirds written as fractions read the same way, so 6 1/3 is 6.1. A figure past .2, such as 6.3 or 6.75, is refused rather than guessed at, because it is a different convention: switch Entered as to Outs and give the out count instead. The Outs cell always shows what the innings came to, and the regulation length switches between nine innings for baseball and seven for softball.

Common questions

How do you calculate ERA?: Earned runs divided by innings pitched, times the selected regulation length. For example, 12 earned runs in 32.0 innings is 96 outs: 12 divided by 32 is 0.375 earned runs an inning, and times nine that is 3.375, shown as 3.38. The result uses two decimals and shows more digits when the value needs rounding.
What does 6.1 innings mean?: Six innings and one out, which is 19 outs. The digit after the point counts outs rather than tenths, so .1 is one out and .2 is two, and there is no .3 because three outs end the inning. The difference is not cosmetic: three earned runs in 6.1 innings is 4.26, while treating 6.1 as a decimal gives 4.43. That is why this page shows the out count next to the average.
How do you calculate ERA for softball or a seven-inning game?: Select 7 innings under Regulation length to calculate earned runs per seven innings. With 12 earned runs in 32.0 innings, the seven-inning ERA is 2.63, compared with 3.38 on the nine-inning scale. Innings pitched is the pitcher's actual innings, separate from the scale. Use the scale specified for the statistic you are calculating; the length of a single outing does not set it.
Can I calculate an MLB pitcher's ERA?: Yes. Enter the pitcher's earned runs and innings pitched from a box score, then select 9 innings. You can use totals for an outing or a season. This page calculates from your entries; it does not look up players, teams or current statistics.
Can I enter outs instead of innings?: Yes. Set Entered as to Outs and give the out count, so 19 rather than 6.1, which suits a partial outing you counted in outs. The page converts it back and shows 6.1 in the Innings cell, so both readings are on screen together, and switching between the two carries the figure across instead of clearing it. Thirds written as fractions read too, so 6 1/3 is the same as 6.1.
What happens if I type 6.5 innings?: It is refused, and the message says what to write instead. Innings notation only uses .0, .1 and .2, for no outs, one out and two outs, so 6.5 is not a figure this page will guess at: reading it as six and a half innings would be a different convention, and nothing is rounded or cut behind your back. Decimal thirds are caught the same way, so 6.33 and 6.67 are pointed back at 6.1 and 6.2.
What counts as an earned run?: Use the earned runs charged to the pitcher in the official box score. The scorer determines that total; this calculator cannot reconstruct it from a run total or a play-by-play. Enter earned runs rather than every run allowed, along with the innings pitched or outs credited to that pitcher.
What is a good ERA?: This page does not grade the number, because what counts as good depends on the level, the park and the season, none of which a calculator knows. What the figure means is fixed: it is the earned runs given up per regulation game, so a lower ERA is fewer earned runs over the same innings. A 3.38 says the 12 earned runs and 96 outs entered work out at 3.38 earned runs per nine innings.
Is anything uploaded?: No. The arithmetic runs in your browser, nothing is sent anywhere and no figure you type reaches a server. The line you last worked on is remembered in your own browser storage so the page opens where you left it, and clearing your browsing data clears it. Copy puts the ERA and the line it came from on the clipboard as plain text, ready for a message or a scorebook note.

Exact arithmetic: earned runs divided by innings pitched, times the regulation length you choose. Baseball notation is read the way it is written, so 32.2 means 32 innings and 2 outs, which is 98 outs, and the page shows the converted outs so you can check it.