Incident Rate Calculator
Work out your safety performance rates — TRIR, DART, LTIFR/LTIR and severity rate — from cases and hours worked, on the OSHA (200,000) or ILO (1,000,000) base. Live and fully offline.
Open Incident Rate Calculator →What is the incident rate calculator?
A free safety-performance calculator that works out your TRIR, DART rate, LTIFR, LTIR and severity rate from case counts and hours worked. Choose the OSHA (200,000) or ILO (1,000,000) base, and the rates update live. It runs entirely in your browser, offline, and is meant as an educational aid rather than official reporting.
How to use Incident Rate Calculator
- Enter total hours worked — Type the combined employee hours for the period — this is the denominator for every rate.
- Add your case counts — Fill in recordable cases, DART cases (days away, restricted or transferred) and lost-time cases, plus the total days lost for the severity rate.
- Pick the calculation base — Select OSHA (200,000 hours, roughly 100 workers for a year) or ILO (1,000,000 hours) to match your reporting convention.
- Read the rates — TRIR, DART rate, LTIFR, LTIR and severity rate update live in the result cards as you change any input.
Frequently asked questions
What does TRIR mean?
The Total Recordable Incident Rate is recordable cases multiplied by the base (200,000 or 1,000,000) and divided by total hours worked — a standard measure of how many recordable injuries and illnesses occur per a fixed block of work hours.
What is the difference between the OSHA and ILO base?
OSHA rates use a base of 200,000 hours (about 100 full-time workers over a year), while many ILO-style frequency rates use 1,000,000 hours. Pick whichever your organisation reports against.
What is the DART rate?
DART stands for Days Away, Restricted or Transferred. It counts cases that led to time off work, restricted duties or a job transfer, expressed on the same base as TRIR.
Is my data sent anywhere?
No. Every figure is calculated and saved entirely in your browser on your device, and the tool works offline.
Can I use these numbers for official reporting?
The tool is educational. Always confirm definitions, recordability and figures against the official OSHA or ILO guidance your reporting requires.
Tips
- Include hours for everyone who worked in the period, including overtime, for an accurate denominator.
- Use the same base consistently so you can compare rates fairly across periods or sites.
- Fill in days lost as well as case counts to get the severity rate, not just the frequency rates.