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Park Factor (BPF) Calculator

LAST UPDATE: September 24th, 2020

Calculator

Definition – What is Batting Park Factor?

Batting Park Factor measures the impact of a specific baseball park.

A batting park factor over 1 favors the hitter, while a BPF under 1 favors the pitcher. The further the number is from one, the more heavily it favors either the hitter or the pitcher.

The metric can also be interpreted a a team’s style of play at home compared to on the road, or as evaluating different baseball parks for their offensive or defensive friendliness.

Formula – How to Calculate BPF

A = (Runs Scored at Home + Runs Against at Home) ÷ Home Games

B = (Runs Scored while Away + Runs Against while Away) ÷ Road Games

BPF = A ÷ B

Example

If team has the following statistics:
Home: Games – 158 | Runs Scored – 790 | Runs Against – 780
Away: Games – 139 | Runs Scored – 841 | Runs Against – 891
then:

BPF = ((790 + 780) ÷ 158) ÷ ((841 + 891) ÷ 139)

BPF = (1570 ÷ 158) ÷ (1732 ÷ 139)

BPF = 9.937 ÷ 12.460

BPF = 0.798

Therefore, the team’s Batting Park Factor is 0.798, or 79.8%.

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