Baseball Fielding Percentage Calculator Other Calculators:SelectBatting AverageOn-Base PercentageSlugging PercentageOPSwOBABABIPIsolated PowerRuns CreatedSecondary AverageTotal BasesAB per HRFielding PercentageRF/GPRF/9ERAWHIPH9HR9SO9BB9SO/BB Ratio About Fielding Percentage Fielding percentage is a stat used to show just how good a fielder is, it takes their number of assists and putouts and divides those by the total number of opportunities which includes errors. Calculation (put outs + assists) / (put outs + assists + errors)