# On Base Percentage (OBP) Calculator

LAST UPDATE: September 24th, 2020

## Definition – What is On Base Percentage?

On Base Percentage (OBP) is the percentage of times a batter gets on base to the number of times they have been at the plate.

A higher OBP is a sign of a hitter that is more likely to advance bases.

It is an alternative to batting average. Compared with BA, OBP includes the number of times they have been walked or hit by a pitch, which are not normally  included in statistics that rely only on upon “at bats.”

## Formula – How to calculate OBP

On Base Percentage (OBP) = (hits + walks + hit by pitch) ÷ (at-bats + walks + hit by pitch + sacrifice flies)

It is the number of times the batter advances to the number of times they have a chance to advance.

### Example

If a batter has been at bat 127 times and in that time has made: 32 hits, 7 walks, been hit by a pitch 2 times, and 3 sacrifice flies, then:

32 hits + 7 walks + 2 hit by a pitch = 41

127 at-bats + 7 walks + 2 hit by a pitch + 3 sacrifice flies = 139

41 ÷ 139 = 0.295

Therefore, the batter’s on-base percentage is 0.295.