Learning how to calculating on base percentage (OBP) is a very simple task which requires basic mathematics. It should take no longer than two minutes, but first let's explain what on base percentage is. On base percentage is how often a player reaches base, whether it is from a hit, walk, or if you are hit by a pitch. Usually a hitter's on base percentage will be around 50 points higher than their batting average depending on the aggressiveness of the hitter. Usually hitters with a higher OBP will hit lead off a team's lineup because of his ability to reach base and score runs.

1. To calculate on base percentage you must first add. You need to add the amount of hits a player gets, the amount of walks a player gets, and the amount of hit-by-pitch a hitter gets together.
2. After you do this you must add again to find the on base percentage. You now must take the amount of at bats, walks, hit by pitch, and sacrifice flies and add those numbers together.
3. After you get these numbers you will take your first number and divide it by your second number  to find the on base percentage. If your number exceeds four numbers to the right of the decimal, then you round to the nearest thousandth. For example if you get .3456 then you round it up to .346

Usually a good OBP to have is around a .380 or higher. The highest OBP in the history of the MLB was a staggering .609 set by Barry Bonds in his incredible 2004 MVP season.