Severity Rate

Severity Rate

IR-04
ASPCSPFoundational

Formula
SR = (Lost days × 200,000) ÷ EH
When to Use

Calculate the rate of workdays lost due to injuries per 100 FTE workers. Measures injury severity.

Symbol Legend
SymbolMeaningUnitNote
SRSeverity Rate
Lost daysTotal calendar days lost or chargeddays
200,000Base hours constanthours
EHTotal employee hours workedhours

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