The Formulas
- TRIR = recordable cases × 200,000 ÷ hours worked.
- DART = cases with days away, restricted duty or job transfer × 200,000 ÷ hours worked.
Worked Example
A company has 75 full-time workers at 2,000 hours each, or 150,000 hours. It logged 3 recordable cases, 2 of them with days away. TRIR is 3 × 200,000 ÷ 150,000 = 4.0. DART is 2 × 200,000 ÷ 150,000 = 2.67. Try your numbers in the incident rate calculator.
What to Count
Use the cases on your OSHA 300 log and actual hours worked, including overtime, and excluding paid leave. Include temporary workers you supervise day to day. First-aid-only cases are not recordable. See the recordkeeping guide.
Is My Rate Good?
Compare with your industry, not a single number: the U.S. Bureau of Labor Statistics publishes rates by industry each year at bls.gov/iif. Small companies see big swings, since one case can move the rate a lot. Many customers also ask for three years of data and your workers’ compensation modifier.
General information, not legal advice. Rules change and State Plan states may differ, so confirm with the current standard or your state agency.