Free Workplace Safety & WHS
Free WHS calculators: LTIFR, TRIFR, noise exposure, NIOSH lifting, fall clearance, WBGT and risk matrix — all browser-based. No data uploaded, no sign-up. Calculations follow NIOSH, ISO, ACGIH, AS/NZS, and ANSI/ASSP standards, covering Australian, New Zealand, UK, and US workplaces. Always supplement online calculations with on-site measurement by a competent person.
8 tools available
Most Popular
Calculate Lost Time Injury Frequency Rate (LTIFR). Enter injuries and hours worked. Supports AU/UK ×1M and OSHA ×200K bases with severity rate.
Try it free →TRIFR CalculatorCalculate Total Recordable Injury Frequency Rate (TRIFR). Covers LTI, MTI, RWI and fatalities. AU/UK and OSHA base rates supported.
Try it free →Risk Matrix CalculatorCalculate risk scores with a colour-coded 3×3, 4×4 or 5×5 risk matrix. Based on ISO 31000. Enter likelihood and consequence for risk band and recommended action.
Try it free →All Workplace Safety & WHS (8)
Calculate Lost Time Injury Frequency Rate (LTIFR). Enter injuries and hours worked. Supports AU/UK ×1M and OSHA ×200K bases with severity rate.
Open tool →TRIFR CalculatorCalculate Total Recordable Injury Frequency Rate (TRIFR). Covers LTI, MTI, RWI and fatalities. AU/UK and OSHA base rates supported.
Open tool →Risk Matrix CalculatorCalculate risk scores with a colour-coded 3×3, 4×4 or 5×5 risk matrix. Based on ISO 31000. Enter likelihood and consequence for risk band and recommended action.
Open tool →Daily Noise Exposure CalculatorCalculate daily noise exposure (LEX,8h) and noise dose for multiple tasks. Supports ISO 9612/AS/NZS 1269 (3 dB) and OSHA (5 dB) exchange rates.
Open tool →NIOSH Lifting Equation CalculatorCalculate Recommended Weight Limit (RWL) and Lifting Index using the NIOSH Revised Lifting Equation. Metric and imperial. All multipliers: HM, VM, DM, AM, FM, CM.
Open tool →Fall Clearance Distance CalculatorCalculate total fall clearance distance for shock-absorbing lanyards and self-retracting lifelines. Includes FFD, deceleration distance, body suspension and safety factor.
Open tool →WBGT Heat Stress CalculatorCalculate Wet Bulb Globe Temperature (WBGT) and heat stress risk. ACGIH TLV action limits with work/rest schedule. Acclimatized and clothing adjustments.
Open tool →Blood Alcohol (BAC) CalculatorEstimate Blood Alcohol Content using the Widmark formula. Enter drinks, weight and time. Shows BAC vs AU/US/UK legal limits. For WHS training purposes only.
Open tool →Frequently Asked Questions
- Are these WHS calculators free?
- Yes. All workplace safety and WHS calculators on Stax are completely free with no sign-up, no usage limits, and no premium tier.
- Are my inputs sent to a server?
- No. All calculations run entirely in your browser. Injury counts, noise levels, personal measurements, and all other inputs never leave your device.
- Which safety standards do these calculators follow?
- Calculators follow published standards: NIOSH Revised Lifting Equation (1994), ISO 9612 and AS/NZS 1269 for noise, ACGIH TLV for heat stress (ISO 7243), ANSI/ASSP Z359 and AS/NZS 1891 for fall clearance, Widmark formula for BAC, and ISO 31000 for risk matrix. Each tool cites its reference standard.
- Can I use these results for legal or compliance reporting?
- These tools are planning aids and educational calculators — not certified compliance instruments. LTIFR and TRIFR results can support internal reporting, but statutory reporting to regulators should be verified with your WHS management system and a qualified safety professional.
- Which safety calculators are available?
- Phase 1 includes LTIFR, TRIFR, Risk Matrix (3×3/4×4/5×5), Daily Noise Exposure (LEX,8h / ISO and OSHA), NIOSH Lifting Equation (RWL and Lifting Index), Fall Clearance Distance (lanyard and SRL), WBGT Heat Stress (instrument and simplified modes), and Blood Alcohol Content (Widmark formula).