HHSRS score calculator

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Training aid only. A formal assessment must be made by a competent assessor using the HHSRS Operating Guidance for England (revised system in force from 23 June 2026), including its standard likelihood and harm scale points and national averages.

Score = (extreme % × 10,000 + severe % × 1,000 + serious % × 300 + moderate % × 10) ÷ likelihood. Category 1 hazards score 1,000 or more.

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