What is the difference between LTIFR and TRIFR?

LTIFR counts only lost-time injuries per hours worked. TRIFR counts all recordable injuries: lost-time injuries, medical-treatment injuries, restricted-work injuries and fatalities. Both calculators support the Australian and UK base of one million hours and the OSHA base of 200,000 hours.

How do TRIFR, TRIR and DART differ?

TRIR is the OSHA total recordable incident rate, calculated per 200,000 hours worked, which is 100 full-time employees for a year. DART counts only cases with days away from work, restricted work or job transfer. TRIFR is the Australian and UK style of total recordable rate. The OSHA calculator reads OSHA Form 300A totals.

Which noise standard should I choose?

Choose the mode that matches the rules where the work happens. Australia and New Zealand (ISO 9612 and AS/NZS 1269) and the UK assess exposure with an equal-energy 3 dB rule. OSHA uses a different exchange rate, 5 dB, and different action levels, so the same day of noise gives different results under each.

Can I use the results for compliance reporting?

They are planning and educational aids, not certified compliance instruments. Injury rates can support internal reporting, but statutory reporting to a regulator, noise assessments and fall-protection plans should be checked by a qualified safety professional within your own management system.

Where do the formulas come from?

Each tool page cites its reference: the NIOSH Revised Lifting Equation, ISO 9612 and AS/NZS 1269 for noise, ACGIH threshold limits for heat stress, ISO 31000 for the risk matrix, OSHA's 4-to-1 rule for ladders and the Widmark formula for blood alcohol.

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Free Workplace Safety & WHS

Workplace health and safety calculators for the numbers that safety officers, supervisors and students are asked for: injury frequency rates (LTIFR, TRIFR, and the OSHA TRIR and DART rates), a risk matrix, daily noise exposure, the NIOSH recommended weight limit for manual lifting, fall clearance for a lanyard or a self-retracting lifeline, heat stress (WBGT), ladder set-up and blood alcohol estimates.

Each tool states the standard it follows and which jurisdiction's convention it uses, because the same quantity is defined differently in Australia, New Zealand, the United Kingdom and the United States: injury rates use a different hours base, and noise exposure uses a different exchange rate. They are planning and training aids, not certified instruments. Statutory reporting, exposure assessments and fall-protection plans need a competent person and your own management system.

10 tools available

Most Popular

LTIFR Calculator

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 →Daily Noise Exposure Calculator

Calculate 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.

Try it free →NIOSH Lifting Equation Calculator

Calculate Recommended Weight Limit (RWL) and Lifting Index using the NIOSH Revised Lifting Equation. Metric and imperial. All multipliers: HM, VM, DM, AM, FM, CM.

Try it free →

Which tool should I use?

Lost time injury frequency: LTIFR Calculator — injuries and hours worked, with the AU/UK per-million base and the OSHA per-200,000 base.
All recordable injuries: TRIFR Calculator — includes lost-time, medical-treatment and restricted-work injuries and fatalities.
US OSHA incident rates: OSHA TRIR & DART Calculator — TRIR and DART from Form 300A totals, with the BLS national rate for comparison.
Ranking a hazard: Risk Matrix Calculator — 3x3, 4x4 or 5x5 colour-coded matrix based on ISO 31000.
How loud a work day is: Daily Noise Exposure Calculator — daily exposure and noise dose across several tasks, in AU/NZ, UK and OSHA modes.
Manual handling limits: NIOSH Lifting Equation Calculator — recommended weight limit and lifting index from the NIOSH equation.
Working at height: Fall Clearance Distance Calculator — total clearance for shock-absorbing lanyards and self-retracting lifelines.
Setting a ladder: Ladder Angle & Height Calculator — OSHA 4-to-1 rule: foot distance, length for a height and a check of your set-up.
Working in the heat: WBGT Heat Stress Calculator — WBGT with ACGIH action limits and a work and rest schedule.
Estimating blood alcohol: Blood Alcohol (BAC) Calculator — Widmark formula against legal limits, for education only.

All Workplace Safety & WHS (10)

LTIFR Calculator

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 Calculator

Calculate Total Recordable Injury Frequency Rate (TRIFR). Covers LTI, MTI, RWI and fatalities. AU/UK and OSHA base rates supported.

Open tool →Risk Matrix Calculator

Calculate 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 Calculator

Calculate 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 Calculator

Calculate 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 Calculator

Calculate total fall clearance distance for shock-absorbing lanyards and self-retracting lifelines. Includes FFD, deceleration distance, body suspension and safety factor.

Open tool →OSHA TRIR & DART Calculator

Calculate TRIR, DART and days-away incident rates from OSHA Form 300A totals and hours worked, with the BLS national rate for comparison.

Open tool →Ladder Angle & Height Calculator

Set a ladder with the OSHA 4-to-1 rule: foot distance from the wall, ladder length for a given height, and a check of your own setup. Feet or metres.

Open tool →WBGT Heat Stress Calculator

Calculate 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) Calculator

Estimate 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

What is the difference between LTIFR and TRIFR?: LTIFR counts only lost-time injuries per hours worked. TRIFR counts all recordable injuries: lost-time injuries, medical-treatment injuries, restricted-work injuries and fatalities. Both calculators support the Australian and UK base of one million hours and the OSHA base of 200,000 hours.
How do TRIFR, TRIR and DART differ?: TRIR is the OSHA total recordable incident rate, calculated per 200,000 hours worked, which is 100 full-time employees for a year. DART counts only cases with days away from work, restricted work or job transfer. TRIFR is the Australian and UK style of total recordable rate. The OSHA calculator reads OSHA Form 300A totals.
Which noise standard should I choose?: Choose the mode that matches the rules where the work happens. Australia and New Zealand (ISO 9612 and AS/NZS 1269) and the UK assess exposure with an equal-energy 3 dB rule. OSHA uses a different exchange rate, 5 dB, and different action levels, so the same day of noise gives different results under each.
Can I use the results for compliance reporting?: They are planning and educational aids, not certified compliance instruments. Injury rates can support internal reporting, but statutory reporting to a regulator, noise assessments and fall-protection plans should be checked by a qualified safety professional within your own management system.
Where do the formulas come from?: Each tool page cites its reference: the NIOSH Revised Lifting Equation, ISO 9612 and AS/NZS 1269 for noise, ACGIH threshold limits for heat stress, ISO 31000 for the risk matrix, OSHA's 4-to-1 rule for ladders and the Widmark formula for blood alcohol.