Calculate OSHA total recordable incident rate (TRIR), DART rate and lost-time rate, and compare with the industry average.
How the osha incident rate calculator (trir & dart) works
Incident rates normalize injuries to 200,000 hours worked — roughly 100 full-time employees for a year — so employers of any size can be compared. Underwriters use them alongside the experience mod.
Formula
Rate = Number of cases × 200,000 ÷ Total hours worked.
How to use it
Enter recordable, DART and lost-time case counts.
Enter total hours worked.
Optionally enter the BLS industry average.
Worked example
7 recordables over 410,000 hours is a TRIR of 3.41 — 42% above a 2.4 industry average.
Frequently asked questions
Where do I find industry averages?
In the Bureau of Labor Statistics Survey of Occupational Injuries and Illnesses, by NAICS code.
What is the difference between TRIR and DART?
TRIR counts all recordable cases; DART counts only those with days away, restricted work or job transfer.
Experience Mod Calculator (NCCI) — Estimate a workers compensation experience modification factor with the NCCI formula: primary/excess split, weighting, ballast and the medical-only reduction.
Workers Comp Premium Calculator — Calculate workers compensation premium by class code: payroll × rate per $100, experience mod, schedule credit, premium discount and expense constant.