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Isolated Power

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Title: Isolated Power  
Author: World Heritage Encyclopedia
Language: English
Subject: Baseball statistics, Defensive Runs Saved, Ultimate zone rating, Stolen base percentage, Out of zone plays made
Collection: Batting Statistics
Publisher: World Heritage Encyclopedia

Isolated Power

Isolated Power or ISO is a sabermetrics baseball statistic which aims to measure a batter's raw power. The 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 could only be attained by hitting a home run in every at-bat. Power hitters ordinarily have an ISO between .240 and .300.

The term "Isolated Power" was coined by Bill James, but the concept dates back to Branch Rickey and his statistician Allan Roth. There are uncertain memories that it was called "power percentage" by Rickey/Roth, and while rare, that has led to that name being used in some circles over the past 35 years.

See also


  • Baseball Prospectus Glossary
  • Baseball Simple : Isolated Power (ISO) Calculator
  • FanGraphs Sabermetrics Library
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