See your TRIR and DART rates without rebuilding the math.
Enter the hours and cases from the period you are reviewing. The calculator uses OSHA's 200,000-hour rate base and shows TRIR/TCR and DART to two decimal places.
Runs in your browser. Nothing is stored or sent to FORM 300 LOGBOOK.
Calculate the rates for one review period.
Total hours worked, recordable cases, and DART cases drive the formulas. If you know the average employee count, add it as context; leaving it blank does not change the calculation.
Your result will appear here.
Enter total hours and the two case counts, then calculate. Average employees are optional. Zero cases are valid and will return a zero rate.
One consistent base makes rates comparable.
OSHA uses 200,000 hours as the equivalent of 100 full-time employees working 40 hours per week for 50 weeks. The base turns your period's case count and hours into a rate per 100 full-time employees.
TRIR / TCR = recordable cases × 200,000 ÷ total hours worked.
DART = Form 300A columns H + I cases × 200,000 ÷ total hours worked. Count each case once, not days.
Average employees are optional context. They are not used in either calculation.
Check the calculation against OSHA guidance.
These links open official federal resources. Use them to confirm terminology, the rate base, and the DART case categories for your situation.
Independent-software boundary. This calculator performs the formulas shown above. It does not decide whether a case is recordable, certify a Form 300A, submit data to OSHA, or replace your review of current requirements.