Baseball Stat Calculators
12 tools · 12 live
Free calculators for every common baseball stat — batting average, OBP, slugging, OPS, ERA, WHIP and more. Type your numbers and the result updates instantly, with the formula and a worked example on every page.
ERA Calculator
Calculate earned run average from earned runs and innings pitched.
Batting Average Calculator
Find a batting average from hits and at-bats.
On-Base Percentage Calculator
Calculate OBP from hits, walks, hit-by-pitch and plate appearances.
Slugging Percentage Calculator
Work out slugging percentage from total bases and at-bats.
OPS Calculator
Add on-base and slugging to get OPS, the all-in-one hitting number.
WHIP Calculator
Calculate walks plus hits per inning pitched.
FIP Calculator
Estimate a pitcher’s ERA from the outcomes they control.
Fielding Percentage Calculator
Calculate fielding percentage from putouts, assists and errors.
BABIP Calculator
Find batting average on balls in play to spot luck and regression.
Magic Number Calculator
See how close a team is to clinching a division or playoff spot.
Slash Line Calculator
Build a full AVG/OBP/SLG/OPS slash line from one set of inputs.
K/9 Calculator
Calculate strikeouts per nine innings, plus BB/9 and K/BB from innings pitched.