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Safety Calculator Hub
OSHA-standard workplace safety metrics — recordable incident rates, DART rate, and related compliance calculations — built for EHS professionals, safety managers, and contractors.
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Safety
TRIR Calculator
Calculate your OSHA Total Recordable Incident Rate (TRIR) and DART rate from recordable incidents and total hours worked.
Formula:TRIR = (Number of Recordable Incidents × 200,000) ÷ Total Hours Worked
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OSHA-Standard Safety Metrics
Our safety calculators use the exact formulas OSHA and the Bureau of Labor Statistics use to compute recordable incident rates — the fixed 200,000-hour base rate (100 full-time employees × 40 hours/week × 50 weeks/year) and the standard recordable/DART incident definitions from 29 CFR 1904.
Read full methodology specificationsTRIR base rate200,000 hours
Base rate derivation100 workers × 40 hrs × 50 wks
Recordkeeping standard29 CFR 1904
Note: These calculators compute rates from figures you supply — they don't replace your OSHA 300 Log or 300A Summary of record.