Sports statistics by the official formulas: batting and pitching lines, passer rating, shooting, save percentage, standings, golf handicaps and bowling scores.
The numbers fans, coaches and league secretaries work out by hand, done the way the leagues define them: a batting line from the box score, ERA and WHIP from innings in baseball notation, NFL and college passer rating, true shooting, a goalie’s save percentage, winning percentage and the magic number, cricket net run rate, Elo ratings, a round-robin fixture list, a World Handicap System estimate from your score history, course handicaps and a frame-by-frame bowling score. Each page states its formula and its source, and every league-specific choice — a tie rule, a handicap basis, a season constant — is yours to enter.
Batting average, on-base percentage, slugging, OPS, isolated power and BABIP from a box-score line, using the MLB definitions.
You get: The slash line (AVG / OBP / SLG), OPS and isolated power, BABIP, total bases and singles — from at-bats, hits, extra-base hits, walks, hit-by-pitches, sacrifice flies and strikeouts.
Open Batting Average, OBP, SLG & OPSEarned run average, WHIP, FIP and the per-nine rates from a pitching line, with innings entered the box-score way (6.2 = 6⅔).
You get: ERA over nine innings (or the seven of softball), WHIP, strikeout-to-walk ratio, K/9, BB/9, H/9 and HR/9, and FIP once you add the season constant — with the innings converted from box-score notation.
Open ERA, WHIP & FIP CalculatorNFL passer rating and NCAA passing efficiency from attempts, completions, yards, touchdowns and interceptions, with each part of the NFL formula.
You get: The NFL passer rating (0 to 158.3) with its four capped parts, the NCAA passing-efficiency rating, completion percentage, yards per attempt and touchdown and interception rates.
Open Passer Rating Calculator (NFL & NCAA)A goalie’s save percentage, goals-against average and goals saved above average from shots, goals and minutes, for any game length.
You get: Save percentage written the hockey way (.917), goals-against average over the game length you set, games played, shots faced per game and — with a league save percentage — goals saved above average.
Open Save Percentage & GAATrue shooting percentage, effective field-goal percentage and FG, 3P, 2P and FT percentages from makes and attempts, with the free-throw factor adjustable.
You get: True shooting and effective field-goal percentage, points and points per shooting attempt, field-goal, two-point, three-point and free-throw percentages, and the three-point and free-throw rates.
Open True Shooting & Effective FG%Expected score and new Elo ratings for two players or teams after a win, draw or loss, with the K-factor your federation or league uses.
You get: Each side’s expected score from the rating difference, both new ratings and the change after the result, and the change for every possible result.
Open Elo Rating CalculatorThe magic number to clinch, games behind and games left for a leader and a chasing team, with or without the tiebreaker.
You get: The leader’s magic number (its elimination number for the chaser), whether it has clinched, games behind, games left for both, the most the chaser can win, and whether the leader can clinch on its own.
Open Magic Number & Games BehindCricket net run rate from runs and overs both ways, with overs in scorecard notation and a bowled-out side charged its full quota.
You get: Net run rate to three places, the run rate scored and conceded, and the overs each side is charged — the full quota when bowled out — for one match or tournament totals.
Open Net Run Rate Calculator (Cricket)A round-robin fixture list by the circle method: every team plays every other once or home and away, with byes for an odd number of teams.
You get: Round-by-round fixtures with home and away, the team with the bye each round, the number of rounds and matches, and each team’s games and home games — from team names or just a count.
Open Round Robin Schedule GeneratorWinning percentage from a record with ties counted your league’s way, the Pythagorean expectation from points, and the wins needed to reach a target.
You get: The winning percentage (.618), games over or under .500, the Pythagorean expected winning percentage and wins from points scored and allowed, and how many of the games left must be won to finish at a target.
Open Winning Percentage CalculatorBowling average from pins and games and league handicap from your basis and percentage, fractions dropped, with the handicap score for a game.
You get: The average with and without its fraction, the handicap per game and per series under your league’s basis and percentage, and a scratch game with the handicap added.
Open Bowling Handicap & AverageScore a ten-pin bowling game frame by frame from scorecard marks (X, /, -) or pin counts, including the tenth frame and games in progress.
You get: The running total in every frame, the final score or the score so far with the most the game can still reach, and the count of strikes, spares, open frames and pins knocked down.
Open Bowling Score CalculatorCourse handicap and playing handicap from a handicap index, slope, course rating and par, for 18 or 9 holes, with the competition’s allowance.
You get: The course handicap and playing handicap (plus handicaps shown with a plus sign), the unrounded figures, the strokes received or given and on which stroke-index holes, and the score the player plays to.
Open Course & Playing HandicapAn estimate of your handicap index by the World Handicap System method, from 18-hole scores with course and slope ratings: every score differential shown.
You get: The score differential of each round, which of the most recent 20 count, the average of the lowest and the adjustment for short records, and the resulting handicap index estimate (to 0.1, at most 54.0).
Open Golf Handicap Calculator (WHS Method)