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H&S & Occupational Hygiene Calculator
OHSA 85/1993 & ISO 45001 aligned — results to 2 decimal places
Safety Performance Indicators
LTIFR – Lost Time Injury Frequency Rate
LTIFR = (LTIs × 1,000,000) ÷ Total Hours Worked
Injuries resulting in ≥1 full lost workday per million hours worked.
Result: —
TRIR – Total Recordable Incident Rate
TRIR = (Total Recordable Incidents × 1,000,000) ÷ Total Hours Worked
All recordable injuries and illnesses per million hours worked.
Result: —
Severity Rate
Severity Rate = (Total Days Lost × 1,000,000) ÷ Total Hours Worked
Days lost due to injuries per million hours worked.
Result: —
Days Away Rate (DAR)
DAR = (Days Away × 200,000) ÷ Total Hours Worked
Standardised for 100 full-time employees (200,000 hours/year).
Result: —
Near Miss Rate
Near Miss Rate = (Near Misses × 1,000,000) ÷ Total Hours Worked
Result: —
Note: Use consistent units. Values and OELs may differ by client or regulator. This is a practical reference tool — not legal advice. Always consult a competent Occupational Hygienist for compliance decisions.
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