Batting Park Factor, also simply called Park Factor or BPF, is a baseball statistic that indicates the difference between runs scored in a team's home and road games.
Most commonly used as a metric in the sabermetric community, it has found more general usage in recent years.
It is helpful in assessing how much a specific ballpark contributes to the offensive production of a team or player.
While some variation can be attributable to fluctuations in offensive[2] and defensive performance, PF accounts for the production of both teams in each park and, correspondingly, is very useful in trying to determine which ballparks are "hitter friendly" and which are "pitcher friendly".
In place of Runs scored and allowed, the formula can easily use home runs, hits or any other statistic to further analyze the park factor of an individual park.