True shooting percentage calculator, with eFG%, FG%, 3P% and FT%
True shooting, effective field-goal and the plain shooting percentages from one box-score line.
Open the calculatorTools · 21 calculators
Sports calculators
Calculators for the statistics our sports guides explain most often. Each one shows its formula, cites the rulebook or reference it comes from, and works through an example calculated by the same code as the calculator itself.
They are free, they run in your browser, and nothing you type into them is sent anywhere.
Basketball
Basketball hub →Per-36 calculator, with usage rate, Game Score and assist-to-turnover ratio
Per-36 rates, usage percentage, Game Score and assist-to-turnover ratio from one player’s box-score line.
Open the calculatorFour factors calculator, with possessions, pace and offensive, defensive and net rating
Dean Oliver’s four factors for a team and its opponent, plus estimated possessions, pace and offensive, defensive and net rating.
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Baseball
Baseball hub →Batting stats calculator: AVG, OBP, SLG, OPS, ISO and BABIP
The full slash line, isolated power and BABIP from one hitter’s counting stats.
Open the calculatorERA calculator: ERA, WHIP, K/9, BB/9, K/BB and FIP
ERA (for nine-inning or shorter games), WHIP, rate stats and FIP from a pitcher’s line.
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American football
American football hub →Passer rating calculator: NFL rating and NCAA passing efficiency
NFL passer rating with its four components, and NCAA passing efficiency, from one stat line.
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Ice hockey
Ice hockey hub →Save percentage and GAA calculator for goalies
Save percentage, goals-against average and shots faced per game from a goalie’s line.
Open the calculatorHockey points percentage calculator, with points pace and magic numbers
Standings points, points percentage, pace over 84 or 82 games, and points-based clinch and elimination numbers against another team.
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Rugby union
Rugby union hub →World Rugby rankings calculator: the points exchange for any result
The rating points two teams exchange for each possible result under World Rugby’s rankings method, as it stands since 1 July 2026.
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MMA and boxing
MMA and boxing hub →What weight class am I? Boxing and MMA weight class finder
The boxing and MMA weight class for any weight, in pounds and kilograms, from four published weight tables.
Open the calculatorFight scorecard: score a boxing or MMA bout round by round
Score three judges’ cards round by round under the 10-point must system, add point deductions, and see the decision.
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Tennis
Tennis hub →Tennis win probability calculator: from points on serve to games, sets and matches
The chance of holding serve and of winning a tie-break, a set and the match, from each player’s share of points won on serve.
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Golf
Golf hub →Golf handicap calculator: estimate your Handicap Index
Score differentials and an estimated Handicap Index under the World Handicap System.
Open the calculatorCourse handicap calculator, with playing handicap by format
The strokes a Handicap Index gives you on a set of tees, and the playing handicap for a format.
Open the calculatorStableford calculator: points per hole from your strokes and Playing Handicap
Stableford points hole by hole and in total, with Playing Handicap strokes allocated by stroke index.
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Any sport
All sport hubs →Pythagorean expectation calculator: expected wins from points, runs or goals
The winning percentage and record a team’s points scored and allowed imply, with sourced exponents.
Open the calculatorDraft order generator: random, snake and third-round-reversal boards
A fair random draft order, and every team’s pick numbers in a snake, 3RR or straight draft.
Open the calculatorPerfect season calculator: how likely is 20–0, 40–0 or an unbeaten season?
The chance of a perfect or unbeaten season from one game’s chance of a win (and of a draw), with the assumptions stated.
Open the calculatorElo rating calculator: expected score, K-factor and rating change for any sport
The expected score and rating change for one result, by Elo’s formula, FIDE’s chess regulations or FIFA’s world ranking method.
Open the calculatorDraft lottery simulator: every team’s chance of every pick, with seeded draws
Exact pick-by-pick chances for a weighted draft lottery — MLB’s 2026 odds or your own league’s — plus repeatable simulated draws.
Open the calculatorMagic number calculator, with elimination number, games behind and winning percentage
The magic number to clinch, the trailing team’s elimination number, games behind and winning percentages for a two-team race.
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How these calculators are built
- Formulas come from the body that defines the statistic — MLB’s Official Baseball Rules, the NFL’s Record & Fact Book, the NCAA’s statisticians’ manual, the USGA’s Rules of Handicapping — or from a standard reference that publishes it, such as Basketball-Reference, Hockey-Reference or MLB.com’s glossary. Every page lists its sources and the date they were checked.
- The worked examples on each page are calculated by the same code as the calculator, and that code is tested against the sources’ own published examples — the NFL’s 122.5 passer rating, the NCAA manual’s 161.71 and the rulebook’s 2.89 ERA among them.
- Results describe performance that has already happened. They are not predictions, and they are not betting guidance.
- The explanations were drafted with AI assistance and have not been reviewed by a person.
Mistakes can be reported through the support page; how corrections are handled is set out in the editorial policy.