View details for Def Eff

Def Eff, or Defensive Efficiency, is the rate at which balls put into play are converted into outs by a team's defense. Def Eff can be approximated with (1 - BABIP), if all you have is BABIP, but a team's actual Def Eff is computed with

1 - ((H + ROE - HR) / (PA - BB - SO - HBP - HR))

the Team Audit Standings use the latter formula.

Def Eff appears in the following BP Glossary Categories:

• Defense
• Sabermetric
• Team Audit