Use our ERA calculator to compute a pitcher’s Earned Run Average (ERA) instantly. Enter earned runs and innings pitched below.
ERA Calculator
Your ERA
What is ERA in Baseball?
ERA (Earned Run Average) measures how many earned runs a pitcher allows per 9 innings pitched. It is one of the most important statistics used to evaluate pitching performance.
A lower ERA indicates stronger pitching performance.
ERA Formula
The official formula for calculating ERA is:
ERA = (Earned Runs × 9) ÷ Innings Pitched
Because baseball tracks partial innings as outs:
- .1 = 1 out (1/3 inning)
- .2 = 2 outs (2/3 inning)
Our calculator automatically converts these correctly to avoid calculation errors.
Example ERA Calculation
If a pitcher allows:
- 3 earned runs
- 7.2 innings pitched
Step 1: Convert 7.2 innings
7 innings + 2 outs = 7 + (2/3) = 7.67 innings
Step 2: Apply formula
ERA = (3 × 9) ÷ 7.67
ERA = 27 ÷ 7.67
ERA = 3.52
The pitcher’s ERA is 3.52.
What is a Good ERA?
ERA performance varies by league and competition level, but generally:
- Below 2.50 → Elite
- 2.50 – 3.50 → Very Good
- 3.50 – 4.50 → Average
- Above 4.50 → Needs Improvement
In professional baseball, maintaining an ERA under 4.00 is considered solid.
Why Use an Online ERA Calculator?
Manual ERA calculations often lead to mistakes due to fractional innings. This tool:
- Converts .1 and .2 correctly
- Prevents math errors
- Delivers instant results
- Works on mobile and desktop
- Requires no signup or download
It is ideal for game tracking, performance analysis, and fantasy baseball management.
Final Thoughts
Our ERA Calculator helps you quickly compute a pitcher’s Earned Run Average using the official baseball formula. Whether you’re a player, coach, fantasy manager, or student, this tool gives precise results — including correct handling of fractional innings like 7.1 and 7.2.