Isolated power

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In baseball, isolated power or ISO is a sabermetric computation used to measure a batter's raw power. One formula is slugging percentage minus batting average.

The final result measures how many extra bases a player averages per at bat. A player who hits only singles would thus have an ISO of 0. The maximum ISO is 3.000, and can only be attained by hitting a home run in every at-bat.

The term "isolated power" was coined by Bill James, but the concept dates back to Branch Rickey and his statistician Allan Roth.[1]

See also[edit]


  1. ^ McCue, Andy. "Allan Roth". Society for American Baseball Research. Society for American Baseball Research. Retrieved 4 June 2016.