Baseball Stats Calculator
Calculate batting average, on-base percentage, slugging, OPS, ERA and WHIP.
About the Baseball Stats Calculator
Batting average is hits per at-bat. On-base percentage counts walks and hit-by-pitches too; slugging weights extra-base hits by total bases. OPS adds the two and is a quick overall measure: about .750 is average for an MLB regular and .900+ is star level. For pitchers, ERA is earned runs per nine innings and WHIP is walks plus hits per inning. Innings are written with outs after the dot: 180.2 means 180⅔.
The formula
OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF); SLG = TB ÷ AB; ERA = 9 × ER ÷ IP; WHIP = (H + BB) ÷ IP
Worked example
Example: Batting line (AVG/OBP/SLG) = .309 / .387 / .533
- Inputs: Stats for: Batting; At bats: 550; Hits: 170; Doubles: 33; Triples: 3; Home runs: 28; Walks: 66; Hit by pitch: 6; Sacrifice flies: 4.
- Formula: OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF); SLG = TB ÷ AB; ERA = 9 × ER ÷ IP; WHIP = (H + BB) ÷ IP
- Result: Batting line (AVG/OBP/SLG) = .309 / .387 / .533
- AVG: .309
- OBP: .387
- SLG: .533
Questions people ask
Why isn't a walk an at-bat?
Walks, HBP and sacrifices don't count as at-bats.
What's a good ERA?
Under 3.00 is excellent in MLB; league average is around 4.