Use this era calculator tool to quickly determine the precise number of years, months, and days between any two dates you choose.

## Era Calculator

**How to Use the ERA Calculator:**

- Enter the total number of
*Earned Runs*allowed by a pitcher. - Enter the total number of
*Innings Pitched*. - Click the “Calculate” button to compute the Earned Run Average (ERA).

**How the Calculator Works:**

The Earned Run Average (ERA) is calculated using the formula: *(Earned Runs / Innings Pitched) * 9*. The result gives the average number of earned runs a pitcher would allow over a 9 inning game.

**Limitations:**

This calculator assumes that all inputs are accurate and that partial innings are entered as decimals (for example, 1/3 of an inning should be input as 0.33). The calculator does not validate for negative numbers or non-numeric values which can result in incorrect calculations. Always verify your inputs for accuracy.