OSHA incident rate calculator
Every OSHA incident rate uses one formula: cases × 200,000 ÷ total hours worked. Enter your OSHA 300A numbers once and get all three rates a GC or prequal portal asks for, TRIR, DART, and LTIFR, with how each compares to the construction average. Nothing you type leaves your browser.
Enter recordable cases and hours to see your rates. Nothing you type leaves your browser.
Common questions
▸How do you calculate an OSHA incident rate?
Every OSHA incident rate uses the same formula: (number of cases × 200,000) ÷ total hours worked. The 200,000 is 100 full-time workers for a year, so the rate reads as cases per 100 workers. TRIR uses all recordable cases, DART uses days-away/restricted/transfer cases, and LTIFR uses lost-time cases only.
▸What is the difference between TRIR, DART, and LTIFR?
TRIR is the broadest: every OSHA-recordable case. DART is the more serious subset with days away, restricted duty, or job transfer. LTIFR (lost time injury frequency rate) counts only cases with days away from work. A contractor with a high TRIR but low DART has many minor recordables; a high DART means the injuries are serious.
▸What is a good OSHA incident rate in construction?
The construction TRIR averages around 2.4 to 3.0 and DART around 1.5. Below those averages stands out to general contractors and prequal reviewers, and a rate of 0 with real hours is the strongest result. Above the average tends to trigger prequalification questions.
▸Where do the numbers come from?
From your OSHA Form 300A annual summary and 300 log: total recordable cases, DART cases (columns H and I), lost-time cases, and total hours worked by all employees for the year.
Prequal portal asking for your safety program with your rates?
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See the safety programTRIR calculatorDART rate calculatorEMR impact calculatorOSHA 300 log explainedHow to get on ISNetworld