What Is ERA
ERA stands for Earned Run Average. It is a key pitching stat in baseball that measures how many earned runs a pitcher allows per standard game length, usually 9 innings. A lower ERA means the pitcher is more effective at preventing scoring.
The formula is simple: ERA = (Earned Runs × Game Innings) ÷ Innings Pitched. For example, if a pitcher gives up 3 earned runs over 6 innings in a 9-inning game, their ERA would be 4.50.
ERA helps coaches, analysts, and fans evaluate a pitcher's performance over time, independent of team defense or scoring support.
What Is an ERA Calculator
An ERA calculator is a quick tool for determining a pitcher's earned run average based on their stats in a game or season. Rather than doing the math yourself, you simply enter earned runs, innings pitched, and the number of innings in a standard game—usually 9 for professional baseball.
This tool is perfect for:
- Tracking ERA during a season
- Comparing pitching performance between players
- Evaluating game-by-game effectiveness
Whether you're a coach, player, or fan, this tool makes ERA tracking fast and accurate.
How To Use the Infinity Calculator ERA Calculator
Step 1: Enter Pitching Stats
- Earned Runs: The number of earned runs the pitcher gave up
- Innings Pitched: Total number of innings pitched (can include decimals like 6.2)
- Game Innings: Usually 9 for pro games, but can be changed for youth or recreational leagues
Step 2: Press “Calculate”
- The calculator multiplies earned runs by game innings, then divides by innings pitched
- This outputs the ERA rounded to two decimal places
Step 3: View Your ERA
- Your Earned Run Average will be shown instantly below
- Use the “Reset” button to clear all fields and try new inputs
This ERA calculator works for single games, full seasons, or custom pitching scenarios. It’s a fast way to understand pitcher efficiency and performance at every level of baseball.