Your mod goes on the same form
Most prequalification forms ask for your experience mod alongside these rates. Check it against your worksheet, see which claims are raising it, and see what next year's will be.
TRIR and DART calculator for contractors
Enter the totals from your OSHA 300A summary for each year. You'll get your TRIR, DART and lost-time rates, the three-year averages that prequalification forms ask for, and how many more cases this year would put you over a customer's limit. It's free, and nothing you type leaves your browser.
Your OSHA 300A totals
The 300A is the yearly summary of your OSHA 300 log. Only the most recent year is required. Where each number is on the form
Your rates
| Year | Hours | Recordable cases | TRIR | DART | Lost-time rate |
|---|
How the rates are calculated
Each rate is the number of cases for every 100 full-time workers in a year. That's 200,000 hours: 100 workers, 40 hours a week, 50 weeks a year. It lets a 12-person company and a 500-person company be compared fairly.
- TRIR (total recordable incident rate) counts every recordable case: columns G, H, I and J. It's (G + H + I + J) × 200,000 ÷ hours worked.
- DART (days away, restricted or transferred) counts the more serious cases: columns H and I. It's (H + I) × 200,000 ÷ hours worked.
- Lost-time rate counts only cases with days away from work: column H. It's H × 200,000 ÷ hours worked.
The three-year figure adds up all the cases and all the hours first, then works out the rate. That's how most prequalification platforms do it. Averaging three yearly rates instead gives a slightly different number when your hours change from year to year.
Where to find these numbers
Your OSHA Form 300A, the yearly summary you post at work each February, has them all:
- Number of cases: the totals for columns G (deaths), H (days away from work), I (job transfer or restriction) and J (other recordable cases).
- Total hours worked by all employees last year: in the employment information section.
Questions
Which cases count as recordable?
Generally, a work-related injury or illness that needs medical treatment beyond first aid, days away, restricted work or a job transfer, or that causes loss of consciousness. If it's on your OSHA 300 log, it counts. If you're not sure about a case, OSHA's recordkeeping rules decide it, not this page.
We have 10 or fewer employees and don't keep OSHA logs. Does this still apply?
Many small companies don't have to keep OSHA logs, but customers can still ask for your rates. Count your work-related injuries the same way and use your payroll hours.
What's a good TRIR?
It depends on your trade and your customer. Many general contractors set a limit, often around their industry's average, and some want lower for high-risk work. The Bureau of Labor Statistics publishes the average rates for each industry every November.
Do you see my numbers?
No. The math runs in your browser, and this page doesn't send what you type anywhere. There are no cookies or tracking scripts. We count how many times the rates are worked out, without any of the numbers.