ERA Calculator (Earned Run Average)

Calculate a pitcher's Earned Run Average (ERA) by entering Earned Runs, Innings Pitched, and selecting your Innings per Game format (MLB 9-inning, Softball 7-inning, or Youth 6-inning). You get back the pitcher's ERA value along with a quality rating — from Elite to Poor — so you can benchmark performance at a glance. The calculator handles fractional innings automatically: .1 means one out (1/3 inning), .2 means two outs (2/3 inning).

Total earned runs allowed by the pitcher (excludes runs from errors).

Use .1 for 1 out (1/3 inning) and .2 for 2 outs (2/3 inning).

Select the regulation game length for your league.

Results

Earned Run Average (ERA)

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ERA Rating

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Innings Pitched (Decimal)

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Regulation Innings

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ERA vs League Benchmarks

Frequently Asked Questions

What is ERA in baseball?

ERA stands for Earned Run Average. It measures a pitcher's effectiveness by calculating how many earned runs they would allow over a full regulation game at their current rate. An earned run is any run that scores without the aid of a fielding error or passed ball. It has been the standard pitching metric since the National League began tracking it in 1912.

How do I calculate earned run average?

The formula is: ERA = (Earned Runs / Innings Pitched) × Game Innings. For MLB, game innings = 9, so you multiply the ratio of earned runs to innings pitched by 9. For example, if a pitcher allowed 15 earned runs over 65.67 innings, their ERA = (15 / 65.67) × 9 = 2.06.

What does ERA of 0.5 mean?

An ERA of 0.5 means the pitcher allows only 0.5 earned runs per 9 innings on average — an exceptional performance rarely sustained over a full season. It indicates the pitcher is nearly unhittable over the sample of innings recorded.

What is considered a good earned run average?

In MLB, an ERA below 2.00 is considered elite, 2.00–3.00 is excellent, 3.00–4.00 is good, 4.00–5.00 is average, and above 5.00 is below average. Standards shift slightly for softball (7-inning) and youth (6-inning) leagues, so always compare ERA within the same league format.

How do fractional innings work in ERA calculation?

In baseball scoring, '.1' after innings pitched means one out recorded (1/3 of an inning), and '.2' means two outs recorded (2/3 of an inning). So 65.1 innings pitched = 65.333 decimal innings, and 65.2 = 65.667. This calculator automatically converts those fractional notations to their true decimal equivalents before computing ERA.

How is ERA calculated differently for softball or youth leagues?

Softball and high school games typically use 7 innings as the regulation game length, while youth and Little League games often use 6 innings. The ERA formula is the same — (Earned Runs / Innings Pitched) × Game Innings — but you substitute 7 or 6 for the game innings value instead of 9.

What is the ERA if a pitcher allowed 5 earned runs over 9 innings?

Using the formula ERA = (5 / 9) × 9 = 5.00. An ERA of 5.00 falls in the below-average range for MLB starters, though it could be acceptable in certain relief or youth contexts.

What is the difference between ERA and WHIP?

ERA measures how many earned runs a pitcher allows per regulation game, while WHIP (Walks plus Hits per Inning Pitched) measures baserunners allowed per inning. Both are standard pitching metrics — ERA focuses on run prevention, WHIP focuses on traffic control. A pitcher with a low ERA and low WHIP is generally considered elite.

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