TRIR & DART rate calculator

TRIR and DART rate formulas

TRIR (total recordable incident rate) uses all recordable cases. DART uses cases with days away from work, restricted work or job transfer. Multiply the case count by 200,000 and divide by the hours your employees actually worked. 200,000 is what 100 full-time employees work in a year (40 hours × 50 weeks), so the answer reads as cases per 100 full-time workers.

Where each number comes from

Every input is on the annual summary you already prepare under 29 CFR 1904.32. Column G counts deaths, H counts cases with days away from work, I counts cases with job transfer or restriction, and J counts other recordable cases. Each case sits in exactly one of those columns, chosen by its most serious outcome. Columns K and L total the days, and the establishment section gives total hours worked.

The day count rate comes from an archived OSHA rate worksheet and measures days rather than cases. BLS publishes no comparable figure, so the calculator shows it without a benchmark.

Need to reconcile the inputs first? Follow the TRIR / TCIR calculation guide for total recordable cases, or the DART calculation guide for columns H and I.

A worked example

A distribution center’s 300A shows no deaths, 2 days-away cases, 1 restricted-duty case, 3 other recordable cases, and 418,600 hours worked.

• TRIR: 6 × 200,000 ÷ 418,600 = 2.87
• DART: 3 × 200,000 ÷ 418,600 = 1.43
• Days-away rate: 2 × 200,000 ÷ 418,600 = 0.96

Against the 2024 private-industry averages of 2.3, 1.4 and 0.8, this site runs above average on TRIR and days away, and within 10% of the average on DART. Press “Try an example” in the calculator to load these numbers.

Common mistakes

• Using headcount × 2,080. Rates need hours actually worked. Overtime counts; paid vacation, sick leave and holidays don’t.
• Counting a case twice. A case with days away and then restricted duty goes only in column H. Adding it to column I as well inflates DART.
• Averaging rates across sites. Each 300A covers one establishment. For a company-wide rate, add up cases and hours across sites, then divide once.
• Comparing with the wrong benchmark. The private-industry average is a starting point. BLS also publishes rates by NAICS industry in Table 1 of its survey.
• Reporting a vague “lost time” figure. Prequalification forms sometimes ask for one, but it isn’t an OSHA or BLS statistic. The closest official figure is the days-away rate, so say which one you report.