OSHA Incident Rate Calculator
Enter the numbers from your OSHA 300 log and payroll. Nothing is sent anywhere.
The headcount box estimates hours at 2,000 per full-time worker. Use real hours from payroll when you report a rate. The sample numbers are an example only.
How Do You Calculate TRIR?
Multiply your recordable cases by 200,000 and divide by total hours worked by all employees in the year. Three cases in 150,000 hours gives a TRIR of 4.0. DART uses the same formula with only days-away, restricted or transfer cases. The 200,000 equals 100 full-time workers for a year.
Incident Rate Questions
What is a good TRIR?
It depends on your industry and size, so there is no single target. Compare with your industry rate from the U.S. Bureau of Labor Statistics at bls.gov/iif. Small companies should look at several years, because one case can move the rate a lot.
What hours do I use?
Use actual hours worked by all employees during the year, including overtime and hours of temporary workers you supervise day to day. Leave out vacation, sick leave and holidays, even when paid.
What is the difference between TRIR and DART?
TRIR counts all OSHA-recordable cases. DART counts only cases with days away from work, restricted duty or job transfer, so it is always equal to or lower than TRIR.
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