Is this an official rating?
No. It is a transparent per-36-minute index combining steals, blocks and defensive rebounds, with our own weights. Treat it as illustrative.
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Defensive Impact Rating Calculator (Basketball)
A transparent per-36-minute defensive index from steals, blocks and defensive rebounds. Illustrative composite, not an official defensive rating.
rating = (steals + blocks + 0.5×def rebounds) × 36 / minutes — illustrative
Frequently asked questions
What are 'stocks'?
A nickname for steals plus blocks, the two headline defensive box-score stats. They capture disruptive defence but miss a lot of quieter work.
Why per 36 minutes?
Because 36 minutes is close to a starter's workload, so per-36 stats let you compare a bench player fairly with a starter.
What does this miss?
Most of defence: positioning, contests that do not become blocks, communication and the shots deterred just by being there. Box-score defence is famously incomplete.
Why count defensive rebounds at half?
Because ending the opponent's possession matters, but a rebound is less purely defensive than a steal or block. The half-weight is a teaching choice you can disagree with.