Interactive Tools
Baseball Stat Calculators
A suite of interactive sabermetric calculators — type in the numbers and get an instant result, the exact formula used, and a one-line read on what it means. Everything runs in your browser; no data is fetched or fabricated. Where a weight or constant changes by season, you can edit it.
wOBA Calculator
Weighted On-Base Average from a hitter's events, using a representative recent-season weight set.
PitchingFIP Calculator
Fielding Independent Pitching from HR, BB, HBP, K and IP — with an editable, league-dependent FIP constant.
HittingBABIP Calculator
Batting Average on Balls In Play, to separate luck from skill and flag regression candidates.
HittingOPS & OPS+ Calculator
On-base plus slugging, and the park/league-relative OPS+ from your league OBP and SLG.
TeamPythagorean Win Expectation
Expected winning percentage and a projected W–L record from runs scored and runs allowed.
FlagshipPower Ranking Builder
Enter several teams' runs scored and allowed; get a live ranked table by Pythagorean wins and run differential, with a bar chart.
Interactive tool
wOBA Calculator
Weighted On-Base Average from a hitter's events, using a representative recent-season weight set. This interactive calculator needs JavaScript; the formula and explanation above work without it.
Interactive tool
FIP Calculator
Fielding Independent Pitching from HR, BB, HBP, K and IP — with an editable, league-dependent FIP constant. This interactive calculator needs JavaScript; the formula and explanation above work without it.
Interactive tool
BABIP Calculator
Batting Average on Balls In Play, to separate luck from skill and flag regression candidates. This interactive calculator needs JavaScript; the formula and explanation above work without it.
Interactive tool
OPS & OPS+ Calculator
On-base plus slugging, and the park/league-relative OPS+ from your league OBP and SLG. This interactive calculator needs JavaScript; the formula and explanation above work without it.
Interactive tool
Pythagorean Win Expectation
Expected winning percentage and a projected W–L record from runs scored and runs allowed. This interactive calculator needs JavaScript; the formula and explanation above work without it.
Interactive tool
Power Ranking Builder
Enter several teams' runs scored and allowed; get a live ranked table by Pythagorean wins and run differential, with a bar chart. This interactive calculator needs JavaScript; the formula and explanation above work without it.
Linear weights and the FIP constant are season-dependent; the defaults shown are representative recent-season values, labeled on each tool. For the published weights of a specific year, see the FanGraphs Library.