Six free baseball statistics calculators covering batting average, on-base percentage, slugging, OPS, ERA, and WHIP. All use standard MLB/NFHS statistical definitions.
Baseball statistics basics
Baseball is the most statistically rich of all major team sports. The key offensive metrics: Batting Average (BA) = hits ÷ at-bats — the simplest measure of hitting success. On-Base Percentage (OBP) = (hits + walks + HBP) ÷ plate appearances — more complete than BA as it includes all ways of reaching base. Slugging Percentage (SLG) = total bases ÷ at-bats — weights extra-base hits. OPS = OBP + SLG — the most widely used single offensive metric.
Key pitching metrics: ERA = (earned runs × 9) ÷ innings pitched — measures run prevention per 9 innings. WHIP = (walks + hits) ÷ innings pitched — measures baserunner prevention.
All baseball tools
6Batting Average Calculator
Calculate a batter's batting average from hits and at-bats.
Open toolOn-Base Percentage (OBP) Calculator
Calculate a batter's on-base percentage including hits, walks and hit-by-pitches.
Open toolSlugging Percentage Calculator
Calculate slugging percentage from singles, doubles, triples and home runs.
Open toolOPS Calculator
Calculate OPS (On-base Plus Slugging) — the essential combined batting metric.
Open toolERA (Earned Run Average) Calculator
Calculate ERA (Earned Run Average) and ERA+ from innings pitched and earned runs.
Open toolWHIP Calculator
Calculate WHIP (Walks + Hits per Inning Pitched) — the key pitching control metric.
Open toolFrequently asked questions
What is a good batting average in baseball?
In Major League Baseball, a .300 batting average is considered excellent — only a small percentage of hitters maintain it across a full season. The MLB average BA typically sits around .245–.255. A .270–.290 average is above average; .250–.270 is around league average; below .230 is poor for a starting player. Note that batting average has declined as a metric in modern baseball analysis, with OPS and wRC+ (weighted runs created plus) considered more complete measures of offensive value.
What does OPS stand for in baseball?
OPS stands for On-Base Plus Slugging — the sum of a batter's on-base percentage (OBP) and slugging percentage (SLG). It is the most widely used single-number offensive summary in modern baseball. An OPS above .900 is excellent; .800–.900 is above average; .700–.800 is average; below .700 is below average. OPS+ adjusts OPS for ballpark factors and the season's offensive environment, with 100 representing league average.
How is ERA calculated in baseball?
ERA (Earned Run Average) = (Earned Runs × 9) ÷ Innings Pitched. Only earned runs count — runs that score due to errors or passed balls are unearned and excluded. An ERA below 3.00 is excellent for a starting pitcher in the modern MLB era; 3.00–4.00 is above average; 4.00–5.00 is around league average; above 5.00 is poor for a starter. Relief pitchers often post lower ERAs because they pitch shorter stints in more controlled situations.