What is ERA?
Earned run average is the number of earned runs a pitcher allows per nine innings — the headline pitching stat since the dead-ball era. Unearned runs (reached via errors) are excluded, which is why official scorers matter to your fantasy team.
How the calculator works
ERA = 9 × earned runs ÷ innings. Baseball counts innings in thirds — 180.1 means 180 and one-third — and this tool converts that notation to decimal automatically. Enter 180.2 for 180⅔ and 180.0 for even innings.
Common use cases
- Fantasy pitching valuation and streaming decisions
- Rotational spot comparisons across parks and eras
- Youth and rec league scoring tables
Formula & context
Sub-3.00 is elite, 3.00–3.50 is very good, and the league average floats between 3.90 and 4.30 depending on the run environment. ERA is park- and defense-dependent — FIP is the defense-independent companion stat.
Frequently Asked Questions
How do I enter two-thirds of an inning?
Type .2 — the calculator treats 6.2 as six and two-thirds (6.667 decimal).
What is a good ERA?
Below 3.00 is elite; the modern league average is around 4.00.
Why exclude unearned runs?
Errors are the defense's fault, so ERA tries to isolate what the pitcher controls.
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