Instantly calculate baseball Earned Run Average (ERA) based on earned runs and innings pitched.
Earned Run Average (ERA) is the most common statistic used to evaluate a baseball pitcher. The formula is incredibly simple: (Earned Runs * 9) / Innings Pitched. Just input your values above for an instant calculation.
In modern Major League Baseball (MLB), an ERA under 4.00 is generally considered average to good. An ERA below 3.00 is excellent and typically indicates a Cy Young Award contender. Anything above 5.00 is considered poor.
In baseball, an inning is divided into 3 outs. If a pitcher gets 1 out before being relieved, they pitched 1/3 of an inning. If they get 2 outs, it's 2/3. Our calculator lets you easily select partial innings instead of forcing you to use messy decimals like 0.333 or 0.667.