Calculateur de moyenne de points mérités (ERA)

The Calculateur de moyenne de points mérités (ERA) turns earned runs and innings pitched into earned run average, the standard rate stat for pitchers in baseball and softball. Enter earned runs, full innings, and extra outs from 0 to 2, or switch to decimal innings for season totals from a league database. Each result lists outs pitched, decimal IP, and the substituted formula so the figure can be checked against a box score or stat sheet.

Calculate earned run average from runs and innings

Earned run average states how many earned runs a pitcher would allow over a full regulation game if that rate held for every inning pitched. Major League Baseball scales the stat to nine innings; seven-inning softball and six-inning youth leagues use the same math with a different innings-per-game factor.

The Calculateur de moyenne de points mérités (ERA) multiplies earned runs by that factor, then divides by innings pitched, and prints the rate to two decimal places.

Pitching lines mix whole innings with partial frames. A broadcast note of 6.2 means six innings plus two outs, not 6.2 on a decimal keypad. The tool keeps full innings and partial outs in separate fields so box-score notation maps cleanly. Decimal IP mode skips the outs step when a season total such as 200.0 innings already comes from an official source.

Enter partial innings as outs

Partial frames are counted in outs because that is how the official scorer records them. One out after a full inning adds one third of an inning; two outs add two thirds. Six full innings plus two outs equals 20 outs, and 20 divided by 3 equals 6.667 innings pitched.

Typing 6.2 as a decimal would mean 6.2 innings, which is wrong for almost every North American box score.

The Calculateur de moyenne de points mérités (ERA) computes outs as full innings times 3 plus partial outs, then converts to IP by dividing outs by 3. That sequence matches how MLB.com and Retrosheet publish fractional innings. When only a decimal IP total is trusted, decimal mode accepts that number directly and still shows the ERA substitution with the IP you entered.

Apply the ERA formula

The definition used across MLB, NCAA, and most amateur leagues is a simple ratio scaled to game length:

ERA = (Earned runs × Innings per game) ÷ Innings pitched

Innings per game defaults to 9 for standard baseball. Select 7 for many fastpitch softball formats or 6 for common Little League lengths so the rate normalizes to the regulation game for that level. Earned runs must be non-negative; innings pitched must be greater than zero or the Calculateur de moyenne de points mérités (ERA) returns a validation message instead of a number.

The breakdown panel mirrors hand calculation: outs pitched, IP, an exact rational check when outs are known, and the final division. Keeping IP as thirds until the last step avoids rounding drift that appears when decimal IP is rounded too early in a spreadsheet.

Calculate ERA for 3 earned runs over 6⅔ innings

Suppose a starter allows 3 earned runs while recording 6 full innings and 2 outs, with nine innings per game selected.

1. Outs pitched: 6 × 3 + 2 = 20 outs
2. Innings pitched: 20 ÷ 3 = 6.667 IP
3. ERA: (3 × 9) ÷ 6.667 = 27 ÷ 6.667 = 4.05

The same answer follows the integer form that keeps everything in outs: (3 × 9 × 3) ÷ 20 = 81 ÷ 20 = 4.05. Both paths are the engine fixture for this calculator; either can be used to audit the on-screen result.

Three earned runs over six and two thirds innings is a common single-game line for spot checks. The rate is above four in a nine-inning scale, which is useful context when comparing a rough outing to a season mark without treating one start as predictive.

Calculate ERA over a full season

Season tables usually publish decimal innings pitched already. For 65 earned runs over 200.0 innings with nine innings per game: ERA = (65 × 9) ÷ 200 = 585 ÷ 200 = 2.93 No outs conversion is required when IP is entered in decimal mode.

The Calculateur de moyenne de points mérités (ERA) still shows the substituted expression (65 × 9) ÷ 200 beside the 2.93 figure. That season-style example is the second engine fixture and matches how end-of-year leaderboards report qualified starters.

Long samples dilute one bad outing. Allow eight earned runs in a single start and a 200-inning season ERA moves by roughly 0.36 points; the same eight over 20 innings adds four full runs to the rate. The calculator does not weight by opponent or park; it only applies the definition to the totals you supply.

Distinguish earned runs from unearned runs

Only earned runs enter the ERA numerator. An unearned run scores because of a fielding error, a passed ball that should have ended the inning, or another ruling where the official scorer reconstructs the frame without the mistake. Those runs affect the score and the pitcher's runs allowed line but not earned run average.

The Calculateur de moyenne de points mérités (ERA) does not watch play-by-play or assign earned versus unearned status. Enter earned runs from a box score, Statcast feed, or league stat provider. If a run's status is disputed, resolve it with the scorer's decision before typing the number. Mixing total runs allowed into the earned runs field will understate ERA.

Wild pitches and balks can affect whether a run is earned without being errors. Passed balls that extend an inning often create unearned runs even when the pitcher threw the pitch. The tool assumes the earned run total you provide already reflects those rulings.

Set innings per game for softball and Little League

Innings per game is the scaling factor in the numerator, not a separate count of frames the pitcher actually threw. The same 3 earned runs over 6.667 IP produce different ERA figures when the regulation game length changes:

Level	Innings per game	Same line (3 ER, 6.667 IP)
MLB and most adult baseball	9	4.05
Many fastpitch softball leagues	7	3.15
Common Little League lengths	6	2.70

Changing the selector recalculates instantly while earned runs and IP stay fixed. Compare pitchers only when they share the same innings-per-game setting and, ideally, the same level of play. A 3.15 ERA in seven-inning softball is not directly interchangeable with a 3.15 ERA in nine-inning baseball without converting the scale.

Understand what a good ERA is

ERA depends on run environment, ballpark factors, and the era of play. A 4.00 mark in a high-scoring season might sit near league average; a 3.50 mark in a low-run year might be ordinary for a starter. The Calculateur de moyenne de points mérités (ERA) reports the math from your inputs and does not fetch live league averages.

Rough MLB benchmarks, labeled as illustrative rather than tied to a single season: under 3.00 often marks strong rotation performance; around 4.00 has been near league average in many recent years; above 5.00 usually signals trouble for a starter who qualifies for the title. Relief pitchers face shorter samples, so their season ERAs swing more from one bad week.

Compare ERA alongside WHIP, strikeout rate, and context stats when evaluating a pitcher. ERA answers runs charged to the pitcher on an earned basis over a scaled game; it does not capture defense, sequencing, or bullpen support on its own.

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Résumé

The Calculateur de moyenne de points mérités (ERA) converts earned runs and innings pitched into earned run average with outs-based partial innings, optional decimal IP for season lines, and selectable innings per game for baseball, softball, and youth lengths. Every result includes outs, IP, and the substituted formula so the rate can be verified by hand.

Pair the figure with earned-run rulings from the official scorer and with context stats when comparing pitchers across parks or seasons.