# Earned Run Average (ERA) Calculator

> Calculate baseball earned run average from earned runs and innings pitched.

Page: https://askcalculators.com/calculator/earned-run-average-calculator/
Definition: https://askcalculators.com/calculator/earned-run-average-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/earned-run-average-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/earned-run-average-calculator/?earnedRuns=4&wholeInnings=7&outs=2&gameInnings=9

## Inputs
- earnedRuns: Earned runs; type=number; required; default=4; min=0
- wholeInnings: Whole innings pitched; type=number; required; default=7; min=0
- outs: Additional outs; type=select; required; default=2; values=0|1|2
- gameInnings: Regulation innings per game; type=number; required; default=9; min=1

## Outputs
- era: Earned run average; format=number; primary
- innings: Decimal innings used; format=number

## Formula
ERA = earned runs × regulation innings ÷ innings pitched

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.