SmartQHSE · Open Source · MIT
Free HSE Calculators
30+ health, safety and environment (HSE / EHS / QHSE) calculators. Every formula cites the source regulation — OSHA, HSE UK, ISO 45001, ILO, NIOSH, ACGIH, NFPA. Zero signup, zero ads, zero runtime dependencies. Used by construction, oil & gas, manufacturing, and industrial safety teams worldwide.
Incident rate calculators
TRIR Calculator
OSHA Total Recordable Incident Rate
TRIR = (Recordable Incidents × 200,000) ÷ Hours Worked
LTIR Calculator
OSHA Lost Time Incident Rate
LTIR = (Lost Time Incidents × 200,000) ÷ Hours Worked
LTIFR Calculator
ISO/ILO Lost Time Injury Frequency Rate
LTIFR = (Lost Time Injuries × 1,000,000) ÷ Hours Worked
DART Rate Calculator
OSHA Days Away, Restricted, Transferred rate
DART Rate = (DART Cases × 200,000) ÷ Hours Worked
Severity Rate Calculator
Days lost per exposure base
Severity Rate = (Days Lost × Base) ÷ Hours Worked
Frequency Rate Calculator
International accident frequency rate
AFR = (Reportable Accidents × 1,000,000) ÷ Hours Worked