What evidence should be kept?

Enter applicant counts and pass counts for each comparison group at the same hiring stage. Calculate each group selection rate by dividing selected candidates by total candidates. Identify the highest selection rate and divide every other group rate by that benchmark.

4/5 rule calculator

4/5 Rule Calculator for Hiring Adverse Impact

A 4/5 rule calculator compares each group selection rate against the highest selection rate. When a group selection rate is less than 80 percent of the highest rate, the result is commonly treated as a potential adverse impact flag that needs review, context, and often counsel.

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Where this fits

A recruiter wants to test whether an AI screen produces different pass rates before sending candidates forward.

An HR analytics team needs a fast check before producing a more formal report.

A compliance team wants to explain why a flagged ratio should trigger review but not be treated as a final legal conclusion.

Operating steps

Enter applicant counts and pass counts for each comparison group at the same hiring stage.
Calculate each group selection rate by dividing selected candidates by total candidates.
Identify the highest selection rate and divide every other group rate by that benchmark.
Flag ratios below 0.80 for review, then inspect sample size, job grouping, stage, and business context.
Record remediation decisions such as threshold adjustment, data rebalancing, or human review.

Common risks

Mixing different roles, locations, or hiring stages into one calculation.
Ignoring small-sample limitations or treating the 4/5 rule as the only statistical test.
Failing to document what action was taken after a ratio fell below 0.80.

How HireBias Audit connects

HireBias Audit includes the 4/5 rule calculator inside a broader audit report generator with tool inventory, risk matrix, and remediation tracking.

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