Lost Time Incident Rate (LTIR)

Lost Time Incident Rate (LTIR)

IR-03
ASPCSPFoundational

Formula
LTIR = (N_lt × 200,000) ÷ EH
When to Use

Calculate rate of injuries resulting in days away from work per 100 FTE workers.

Symbol Legend
SymbolMeaningUnitNote
LTIRLost Time Incident Rate
N_ltNumber of lost time casesCases where worker missed work days
200,000Base hours constanthours
EHTotal employee hours workedhours

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