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Walks per 9 Innings (BB/9) Calculator

LAST UPDATE: September 23rd, 2020

BB/9 Calculator

Definition – What is Walks per 9 Innings (BB/9)?

BB/9 shows how frequently a pitcher walks batters.

A lower BB/9 is considered better, as it means that the pitcher walks fewer batters in each inning pitched.

Formula – How to calculate BB/9

BB/9 = 9 x (Walks ÷ (Innings Pitched + (Outs (Partial Innings) Pitched / 3))

Example

If a pitcher has allowed 43 walks over 202 innings and 1 out, then:
BB/9 = 9 x (43 ÷ (202 + (1 / 3))
BB/9 = 9 x (43 ÷ 202.333333)
BB/9 = 9 x 0.2152
BB/9 = 1.913
Over an average of 9 innings, this pitcher will have walked 1.913 batters.

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