Baseball ERA Calculator (Earned Run Average)
Enter earned runs allowed and innings pitched to calculate ERA.
Baseball ERA Calculator (Earned Run Average)
Calculate a pitcher’s Earned Run Average (ERA).
This is a straightforward statistical calculation; innings pitched should be entered using baseball’s standard notation (e.g. 120.1 innings means 120 innings and 1 out, not 120.1 full innings) for full accuracy.
ERA is one of baseball’s most widely used pitching statistics, standardizing earned runs allowed to a per-nine-innings basis so pitchers with different amounts of playing time can be fairly compared.
Example
- With the default values shown above, this calculator returns: Earned Run Average ≈ 3.00.
Frequently Asked Questions
What is a good ERA?
In modern professional baseball, an ERA below 3.00 is generally considered excellent, below 4.00 is solid, and above 5.00 is considered below average, though standards shift over different eras of the sport.
Why “earned” runs specifically?
Earned runs exclude runs that scored because of fielding errors or passed balls, aiming to isolate the runs a pitcher is directly responsible for allowing.