43 free HSE calculators and 12 practice exams, built by our team and made freely available to safety professionals, students, and anyone preparing for an HSE role or certification. Every tool opens in a new tab — no signup required.
Organized by discipline — each calculator cites its underlying standard or methodology (OSHA, NIOSH, NFPA, IEEE, ISO, ACGIH, and others) and shows its formula alongside the result.
Total Recordable Incident Rate, per OSHA/ISO conventions.
Lost Time Injury Frequency Rate across international/OSHA bases.
Days Away, Restricted, or Transferred case rate.
Accident Frequency Rate with built-in FAR and TRIR conversion.
Flexible BLS-style rate for any OSHA 300A case category.
Lost workdays per hours worked — how bad, not just how often.
The foundational denominator for every rate calculator.
API RP 754 process safety event rate calculation.
Determine Tier 1/2 classification for a loss of containment event.
Multi-segment noise dose and 8-hr TWA per OSHA/NIOSH.
TWA vs. STEL/excursion limit compliance checking.
Wet Bulb Globe Temperature and ACGIH work/rest guidance.
Room ACH and CDC airborne contaminant clearance time.
TWA, extended-shift adjustment, and mixture exposure index.
NFPA 10 travel distance and floor-area coverage.
OSHA 1910.106 cabinet and incidental storage limits.
Convert gas detector readings to actual concentration.
Fire load density per EN 1991-1-2 (Eurocode 1).
Likelihood x Severity with a live visual risk matrix.
Severity x Occurrence x Detection, ranked by priority.
Gross Disproportion Factor for risk reduction decisions.
UK HSE individual risk bands and F-N societal risk.
Recommended Weight Limit and Lifting Index.
Upper limb and whole-body postural risk assessment.
Required force to move a load, by surface and incline.
OSHA 4:1/6:1 safety factor and duty rating classification.
ASME B30.9 rigging sling tension and load angle factor.
OSHA Appendix B maximum allowable slope by soil type.
Required clearance for a personal fall arrest system.
IEEE 1584-2002 incident energy and arc flash boundary.
NEC Table 310.16 ampacity, derating, and voltage drop.
Scope 1 & 2 emissions using DEFRA/EPA factors.
Multi-stream diversion rate and disposal cost.
Water supply and sewerage cost via return-to-sewer method.
SFPE hydraulic flow method for egress time.
Planning-level first aider staffing estimate.
Initial and recurring PPE program cost planning.
Weighted compliance rate across multiple training courses.
Weighted audit scoring with critical-finding override.
16-section GHS/OSHA HazCom format completeness check.
Verified 16-section reference data for common chemicals.
Material quantity and cost from plot area and floors.
Solar panel/inverter/battery sizing and installed cost.
Real-time, one-question-at-a-time practice exams with a live progress gauge, timer, and full results breakdown at the end — including the correct answer and rationale for anything missed.
Root cause analysis, 5 Whys, FTA, FMEA — 6 modules.
ISO 31000, risk culture, human factors — 6 modules.
Safety culture, hazard recognition, site rules & rights.
Fire classification, extinguishers, evacuation duties.
Primary survey, CPR, wounds/burns/fractures, emergencies.
Body mechanics, safe lifting, TILE risk assessment.
Fall hazards, ladders, fall protection, scaffolding.
Atmospheric testing, permits, rescue & emergency response.
Selection, use, and maintenance of protective equipment.
Emergency planning, evacuation, incident command.
PTW systems, isolation, lockout-tagout procedures.
Hazard perception, following distance, fatigue & distraction.
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