Free LL144 tool
Calculate an LL144 impact ratio.
Enter the category rate and the appropriate comparator rate. The tool shows the arithmetic only — it does not determine discrimination or legal compliance.
Use consistent units: for example, 0.47 ÷ 0.52 or 47 ÷ 52 produce the same ratio.
What this tool does — and does not do
For selection outputs, the rule defines impact ratio using the category selection rate and the most selected category. For scoring outputs, it uses the category scoring rate and the highest scoring category. See the full impact-ratio guide.
Primary sources
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