ERA Calculator — Earned Run Average & WHIP

Calculate ERA from innings pitched and earned runs, with correct baseball innings notation (outs, not decimals). Includes bonus WHIP calculation.

July 2, 2026

Innings Pitched

Baseball notation "6.1" means 6 innings + 1 out (6⅓), not a decimal — select outs separately to avoid this common error.

Earned Runs

Game Length

Bonus: WHIP (walks + hits, optional)

Very Good

ERA = 2.84

6.333 actual innings pitched

ERA = (Earned Runs ÷ Actual Innings Pitched) × Game Length. WHIP = (Walks + Hits) ÷ Actual Innings Pitched. "Actual innings" converts partial-inning outs correctly (1 out = ⅓ inning, 2 outs = ⅔ inning) rather than treating the ".1"/".2" notation as a decimal, which is a common calculation error.

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Reference Values

Last verified: Jul 2, 2026

Category	Range	What It Means	Status
Elite ★	Below 2.50 ERA	Cy Young Award caliber performance — places a pitcher among the league leaders.	★ Best
Very Good	2.50 – 3.25 ERA	Strong, above-average performance typical of a top-of-rotation starter or elite reliever.	Good
Solid / Average	3.25 – 4.00 ERA	Below the MLB league average (typically 4.00–4.50) — a dependable rotation or bullpen contributor.	Okay
Below Average	Above 4.50 ERA	Struggles to hold a rotation spot on a competitive team at the MLB level — context (league level, ballpark) matters more at amateur levels.	Poor

Source: MLB pitching performance benchmarking (Baseball-Reference league averages, current-era ERA/WHIP tiering commonly used in baseball analysis)

Worked Examples

6.1 IP (6 innings, 1 out), 2 Earned Runs

Innings Pitched: 6.1 (6 innings + 1 out)
Earned Runs: 2
Game Length: 9 innings

ERA = 2.84

6.1 IP means 6 full innings plus 1 out — 6⅓ innings (6.333), not 6.1 as a decimal. ERA = 2 ÷ 6.333 × 9 = 2.84.

7.0 IP, 4 Earned Runs

Innings Pitched: 7.0
Earned Runs: 4
Game Length: 9 innings

ERA = 5.14

4 ÷ 7 × 9 = 5.14. Above the MLB-average range, reflecting a rougher outing.

5.2 IP (5 innings, 2 outs), 1 Earned Run

Innings Pitched: 5.2 (5 innings + 2 outs)
Earned Runs: 1
Game Length: 9 innings

ERA = 1.59

5.2 IP means 5⅔ innings (5.667). ERA = 1 ÷ 5.667 × 9 = 1.59 — an elite single-game rate.

Bonus: WHIP for the Same 6.1 IP Outing (2 Walks, 5 Hits)

Innings Pitched: 6.1
Walks: 2
Hits: 5

WHIP = 1.11

(2 + 5) ÷ 6.333 = 1.11 — in the 'great' WHIP tier (1.10–1.25), just above the elite threshold.

How to Use This Calculator

1

Enter innings pitched (whole innings)

Enter only the whole-inning portion — outs are entered separately below.
2

Select the partial-inning outs

Choose +0, +1, or +2 outs to correctly represent notation like '6.1' (6 innings + 1 out) as an actual fraction, not a decimal.
3

Enter earned runs allowed

Only runs charged as earned (not resulting from errors or passed balls) count toward ERA.
4

Select game length and optionally add walks/hits for WHIP

Choose 9-inning (standard) or 7-inning (Little League/softball) games. Add walks and hits to also see WHIP for the same outing.

What Each Value Means

ERA (Earned Run Average) (runs per game): The average number of earned runs a pitcher allows per standard game (9 innings in most leagues), calculated as (Earned Runs ÷ Innings Pitched) × Game Length. Lower ERA indicates better run prevention.
Innings Pitched (Actual) (innings): The true fractional value of innings pitched, correctly converting outs-based notation (.1 = ⅓ inning, .2 = ⅔ inning) rather than treating it as a literal decimal — essential for an accurate ERA calculation.
WHIP (baserunners per inning): Walks plus Hits per Inning Pitched — a companion pitching stat measuring baserunners allowed per inning, calculated as (Walks + Hits) ÷ Innings Pitched.

Frequently Asked Questions

How do you calculate ERA (Earned Run Average)?

ERA = (Earned Runs ÷ Innings Pitched) × 9 for a standard 9-inning game (use × 7 for 7-inning Little League or softball games). For example, allowing 2 earned runs over 6⅓ innings: 2 ÷ 6.333 × 9 = 2.84 ERA. The lower the ERA, the better the pitcher's run prevention.

What does '6.1' or '6.2' mean in innings pitched?

Baseball innings-pitched notation is NOT decimal — it's outs-based. '.1' means 1 out recorded in the partial inning (⅓ of an inning), and '.2' means 2 outs recorded (⅔ of an inning). So '6.1 IP' means 6 full innings plus 1 out = 6⅓ innings (6.333 as an actual fraction), not 6.1 as a literal decimal. Using the wrong conversion is one of the most common ERA calculation mistakes — this calculator asks for innings and outs separately to avoid it.

What is a good ERA in baseball?

At the MLB level: below 2.50 is considered elite (Cy Young caliber), 2.50–3.25 is very good, 3.25–4.00 is solid and above the modern league average (which typically runs 4.00–4.50), and above 4.50 is considered below average for a competitive rotation spot. At youth, high school, and college levels, typical ERA ranges run considerably higher due to different competition levels, so compare within your own league rather than against MLB benchmarks directly.

What is WHIP and how does it relate to ERA?

WHIP (Walks plus Hits per Inning Pitched) measures how many baserunners a pitcher allows per inning, calculated as (Walks + Hits) ÷ Innings Pitched. It's a companion stat to ERA — a pitcher can have a good ERA with a mediocre WHIP if they strand runners well, or vice versa. MLB benchmarks: below 1.00 is elite, 1.00–1.10 is excellent, 1.10–1.25 is great, and the league average typically runs 1.30–1.40.

Does game length (9 innings vs 7 innings) affect ERA calculation?

Yes — ERA is scaled to a standard game length, which is 9 innings in MLB, most high school, and college baseball, but 7 innings in Little League and most fastpitch softball. The multiplier in the formula changes accordingly (× 9 or × 7), so make sure to select the correct game length for your league before comparing ERA figures across different levels of play.