On Base Percentage (OBP)
Divide the total number of hits, bases on balls and times hit by pitch by the total of at-bats, bases on balls, times hit by pitch and sacrifice flies. For example, if Shawn Green has 619 at-bats, 184 hits, 72 bases on balls, 5 times hit by pitch and 5 sacrifice flies, his on-base percentage is .372 ((184+72+5)/(619+72+5+5)).