Sports statistics
Batting average, OBP, SLG and OPS, ERA and WHIP, Elo and FIDE rating changes, NFL passer rating and bowling scores, by each sport's own rules.
Batting Average Calculator
Work out a batting average, on-base percentage, slugging percentage and OPS from at bats, hits, walks and extra-base hits, by rule 9.21 of the Official Baseball Rules.
ERA Calculator
Work out a pitcher's earned run average and WHIP from earned runs, hits, walks and innings pitched, with innings typed the box-score way, 6.2 for 6⅔.
Elo Rating Calculator
Work out the expected score and the rating change after one game, by the Elo formula or by the FIDE rating regulations with their table and 400-point rule.
Passer Rating Calculator
Work out an NFL passer rating from attempts, completions, yards, touchdowns and interceptions, with each of the formula's four capped parts shown.
Bowling Score Calculator
Type a ten-pin game the way a score sheet marks it, X for a strike and / for a spare, and get the score frame by frame under the USBC rules.
Golf Handicap Calculator
Work out a World Handicap System handicap index from your scores or score differentials, and the course handicap an index gives on a set of tees.
Every statistic here is defined by the body that keeps it, and each page follows that definition rather than a simplified version. Batting and pitching rates come from rule 9.21 of the Official Baseball Rules, which is why sacrifice flies count against on-base percentage but not batting average, and why innings are counted in thirds. Passer rating is the NFL's own four-part formula from its Record & Fact Book, each part capped at 2.375. Chess ratings can be worked out two ways, the logistic Elo formula used by many federations and FIDE's own table with its 400-point rule, and the page lets you pick. Bowling follows the USBC rules for strikes, spares and the tenth frame. The results are exact arithmetic on the numbers you enter. None of the pages says what counts as a good figure.