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Baseball ERA Calculator

Calculate ERA, WHIP, FIP, and advanced pitching metrics

ERA

3.60

WHIP

1.25

FIP

3.68

Use .1 and .2 for outs (e.g., 6.2 = 6 innings + 2 outs)

ERA

3.60

MLB avg: 4.23 (Above Avg)

WHIP

1.25

FIP

3.68

K/9

9.8

BB/9

3.0

K/BB Ratio

3.25

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Frequently Asked Questions

Q

How is ERA calculated in baseball?

Earned Run Average (ERA) equals earned runs divided by innings pitched, multiplied by 9. The formula is ERA = (ER / IP) × 9. This normalizes earned runs to a standard 9-inning game. Only earned runs count; runs resulting from errors are excluded from ERA calculation.

  • Formula: ERA = (ER / IP) * 9
  • MLB average ERA: ~4.23 (2023 season)
  • Sub-3.00 ERA: elite starting pitcher territory
  • Sub-2.00 ERA: historically dominant (Cy Young caliber)
  • Innings pitched .1 and .2 mean 1 and 2 outs, not decimals
ERA RangeRatingExample PitchersPercentile
Under 2.50ElitedeGrom, Scherzer peakTop 5%
2.50-3.50ExcellentAce-caliber starterTop 20%
3.50-4.25Above AvgSolid starter20-50th
4.25-5.00AverageBack-of-rotation50-75th
5.00+Below AvgReplacement levelBottom 25%
Q

What is WHIP and what is a good WHIP?

WHIP (Walks + Hits per Innings Pitched) measures baserunners allowed per inning. Formula: WHIP = (H + BB) / IP. A WHIP under 1.00 is elite. The MLB average is about 1.28. WHIP is more stable than ERA because it removes the luck element of whether baserunners score.

  • Formula: WHIP = (Hits + Walks) / Innings Pitched
  • MLB average WHIP: ~1.28 (2023 season)
  • Elite: under 1.00 (less than one baserunner per inning)
  • Good: 1.00-1.20 (All-Star caliber)
  • Average: 1.20-1.35 (solid major league pitcher)
WHIP RangeRatingBaserunners/9 IPERA Correlation
Under 1.00Elite<9Usually sub-3.00
1.00-1.15Excellent9-10.43.00-3.50
1.15-1.30Above Avg10.4-11.73.50-4.25
1.30-1.45Average11.7-13.14.25-5.00
1.45+Poor13+5.00+
Q

What is FIP and why is it different from ERA?

Fielding Independent Pitching (FIP) estimates ERA based only on outcomes a pitcher controls: strikeouts, walks, hit-by-pitches, and home runs. Formula: FIP = ((13×HR + 3×(BB+HBP) - 2×K) / IP) + constant. ERA-FIP gap reveals luck or defense quality effects.

  • Formula: FIP = ((13*HR + 3*(BB+HBP) - 2*K) / IP) + cFIP
  • cFIP constant: ~3.10 (adjusts to match league ERA)
  • FIP < ERA: pitcher is better than ERA shows (bad defense/luck)
  • FIP > ERA: pitcher is worse than ERA shows (good defense/luck)
  • FIP is better for predicting future ERA than current ERA
MetricIncludes Defense?Includes BABIP?Best For
ERAYesYesOverall results
FIPNoNoTrue ability estimate
WHIPPartialPartialBaserunner control
xFIPNoNoHR-normalized ability
Q

What is a good K/9 and BB/9 rate for a pitcher?

K/9 measures strikeouts per 9 innings. The MLB average is about 8.6 K/9. Elite power pitchers exceed 10.0 K/9. BB/9 measures walks per 9 innings, with the MLB average at 3.3 BB/9. Elite control pitchers keep BB/9 under 2.0. The K/BB ratio combines both into one metric.

  • MLB average K/9: 8.58 (2023 season)
  • Elite K/9: 10.0+ (dominant strikeout pitcher)
  • MLB average BB/9: 3.28 (2023 season)
  • Elite BB/9: under 2.0 (exceptional control)
  • K/BB ratio of 3.0+ is excellent (elite command)
K/9 RateBB/9 RateK/BB RatioRating
11.0+1.5-2.05.5+Dominant
9.0-10.92.0-2.53.6-5.0Excellent
7.5-8.92.5-3.52.5-3.5Average
6.0-7.43.5-4.51.5-2.5Below Avg
<6.04.5+<1.5Poor
Q

How do I read innings pitched with decimal notation?

In baseball, innings pitched decimals represent outs, not fractions. IP of 6.1 means 6 full innings plus 1 out (6 and 1/3 innings). IP of 6.2 means 6 innings plus 2 outs (6 and 2/3 innings). There is no 6.3 because 3 outs completes the inning (becomes 7.0).

  • 6.0 IP = 6 full innings = 18 outs
  • 6.1 IP = 6 innings + 1 out = 19 outs = 6.333... true innings
  • 6.2 IP = 6 innings + 2 outs = 20 outs = 6.667... true innings
  • 7.0 IP = next full inning (not 6.3)
  • For ERA: convert .1 to 1/3 and .2 to 2/3 before dividing

Example Calculations

1Ace Starter Season Line

Inputs

Innings Pitched200.0
Earned Runs55
Hits / BB / K / HR / HBP155 / 45 / 220 / 18 / 8

Result

ERA2.48
WHIP1.00
FIP3.05
K/99.9

ERA = (55/200)*9 = 2.475, rounded 2.48. WHIP = (155+45)/200 = 1.00. K/9 = (220/200)*9 = 9.9. BB/9 = (45/200)*9 = 2.0. FIP = ((13*18 + 3*(45+8) - 2*220)/200) + 3.10 = ((234+159-440)/200)+3.10 = (-47/200)+3.10 = -0.235+3.10 = 2.87. Note: FIP lower than ERA indicates elite strikeout ability.

2Average MLB Starter

Inputs

Innings Pitched120.0
Earned Runs48
Hits / BB / K / HR / HBP110 / 40 / 130 / 15 / 5

Result

ERA3.60
WHIP1.25
FIP3.68
K/99.8

ERA = (48/120)*9 = 3.60. WHIP = (110+40)/120 = 1.25. K/9 = (130/120)*9 = 9.75, rounded 9.8. FIP = ((13*15 + 3*(40+5) - 2*130)/120) + 3.10 = ((195+135-260)/120)+3.10 = (70/120)+3.10 = 0.583+3.10 = 3.68.

3Struggling Pitcher with Lucky ERA

Inputs

Innings Pitched80.0
Earned Runs30
Hits / BB / K / HR / HBP75 / 35 / 55 / 12 / 4

Result

ERA3.38
WHIP1.38
FIP5.14
K/96.2

ERA = (30/80)*9 = 3.375, rounded 3.38. WHIP = (75+35)/80 = 1.375, rounded 1.38. K/9 = (55/80)*9 = 6.19, rounded 6.2. FIP = ((13*12 + 3*(35+4) - 2*55)/80)+3.10 = ((156+117-110)/80)+3.10 = (163/80)+3.10 = 2.0375+3.10 = 5.14. ERA-FIP gap of -1.76 suggests ERA will regress upward due to low K rate and high walk rate.

Formulas Used

Earned Run Average (ERA)

ERA = (Earned Runs / Innings Pitched) × 9

Standard measure of runs allowed per 9 innings, excluding unearned runs from errors.

Where:

Earned Runs= Runs scored without benefit of errors or passed balls
Innings Pitched= Total innings pitched (convert .1/.2 to thirds)
9= Standard game length for normalization

WHIP

WHIP = (Hits + Walks) / Innings Pitched

Measures baserunners allowed per inning. Lower is better.

Where:

Hits= Total hits allowed
Walks= Bases on balls (BB) issued
Innings Pitched= Total innings pitched

Fielding Independent Pitching (FIP)

FIP = ((13 × HR + 3 × (BB + HBP) - 2 × K) / IP) + cFIP

Estimates ERA from only pitcher-controlled outcomes. The constant (~3.10) scales to match league ERA.

Where:

HR= Home runs allowed
BB= Walks issued
HBP= Hit-by-pitches
K= Strikeouts
IP= Innings pitched
cFIP= League constant (~3.10, adjusts annually)

Understanding Advanced Pitching Metrics

ERA has been the standard pitching metric since the early 1900s, but modern analytics has revealed its limitations. ERA is heavily influenced by defense quality, ballpark factors, and sequencing luck (whether hits happen with runners on base). Two pitchers with identical stuff can have very different ERAs based on factors beyond their control.

FIP (Fielding Independent Pitching) isolates the three outcomes a pitcher fully controls: strikeouts, walks/HBP, and home runs. By weighting these outcomes (13×HR + 3×(BB+HBP) - 2×K divided by IP, plus a league constant), FIP estimates what a pitcher's ERA should be with league-average defense and luck. When FIP is significantly lower than ERA, expect ERA to improve; when FIP is higher, regression is likely.

This calculator computes ERA, WHIP, FIP, K/9, BB/9, K/BB ratio, and H/9 from your raw pitching statistics. It handles the baseball-specific innings pitched notation (6.2 = 6 innings + 2 outs) and compares every metric against MLB averages. Use the ERA-FIP comparison to identify whether results are sustainable or luck-driven.

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Last Updated: Mar 25, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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