Isolated Power

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.

$ISO=SLG-AVG$

$={\frac {({\mathit {1B}})+(2\times {\mathit {2B}})+(3\times {\mathit {3B}})+(4\times {\mathit {HR}})}{AB}}-{\frac {H}{AB}}$

$={\frac {({\mathit {1B}})+(2\times {\mathit {2B}})+(3\times {\mathit {3B}})+(4\times {\mathit {HR}})-({\mathit {1B}}+{\mathit {2B}}+{\mathit {3B}}+{\mathit {HR}})}{AB}}$

$={\frac {({\mathit {2B}})+(2\times {\mathit {3B}})+(3\times {\mathit {HR}})}{AB}}$

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]

References

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

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

Baseball statistics
Batting	Batting average On-base percentage Slugging percentage Hit Single Double Triple Home run Extra-base hit Grand slam Total bases RBI Game-winning RBI Walk Bunt Sacrifice bunt Sacrifice fly On-base plus slugging Times on base Walk-to-strikeout ratio Walk percentage
Base running	Run Stolen base Stolen base percentage Caught stealing
Pitching	Win–loss record Innings pitched Pitchers of record Save Hold Run Earned ERA Strikeout Walk Perfect game No-hitter WHIP BB/9 K/9 Quality start Complete game Shutout Wild pitch Strikeout-to-walk ratio
Fielding	Fielding percentage Assist Putout Error Fielder's choice Defensive indifference Passed ball
Sabermetrics	Adjusted ERA+ Base runs Batting average on balls in play Batting park factor Catcher's ERA Defensive Runs Saved Extrapolated Runs Game score Isolated Power Range factor Runs created Runs produced Secondary average Speed Score NERD Out of zone plays made Ultimate zone rating Value over replacement player Weighted on-base average Wins Above Replacement Win probability added Win Shares

Isolated Power

See also

References