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
=
| TB-H | |
| AB |
=
| (1B)+(2 x 2B)+(3 x 3B)+(4 x HR) | |
| AB |
-
| H | |
| AB |
=
| (1B)+(2 x 2B)+(3 x 3B)+(4 x HR)-(1B+2B+3B+HR) | |
| AB |
=
| (2B)+(2 x 3B)+(3 x 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]