What is the ERA calculation?

The ERA calculation is earned runs multiplied by game length, divided by IP.

Does ERA calculation use earned runs only?

Yes. ERA calculation uses earned runs, not total runs.

Main keyword

ERA calculation turns a pitching line into a normalized Earned Run Average for one regulation game.

ERA = earned runs x game length / IP. Use 9 for most baseball games and 7 for many softball games.

A pitcher gives up 3 earned runs over 7 full frames in a 9-frame baseball game. The calculation is 3 x 9 / 7 = 3.86.

Scorebook notation uses .1 for one out and .2 for two outs. Convert those outs to thirds before completing the calculation.

Use the baseball ERA calculator for 9-frame games, the softball ERA calculator for softball, or the ERA calculator 7 innings page for any 7-frame format.