DART Rate & TRIR Calculator
Enter your workforce numbers and get your incident rates instantly — then see how you compare to your industry.
Enter Your Workforce Data
Annual average headcount (full-time equivalents)
Total hours actually worked by all employees during the year
Total OSHA-recordable injuries and illnesses for the year
Cases involving days away, restricted duty, or job transfer
What Is TRIR?
The Total Recordable Incident Rate (TRIR) — also called the Total Case Incidence Rate (TCIR) — measures how many OSHA-recordable injuries and illnesses occur per 100 full-time equivalent workers over a one-year period. It’s the most commonly referenced safety metric in the United States and is used by OSHA, insurance underwriters, and clients during contractor pre-qualification.
The formula is: TRIR = (Number of Recordable Incidents × 200,000) ÷ Total Hours Worked. The 200,000 constant represents the approximate hours 100 full-time employees work in a year (100 workers × 40 hours/week × 50 weeks).
What Is the DART Rate?
The DART rate — Days Away, Restricted, or Transferred — tracks the subset of recordable incidents that result in lost workdays, restricted duty, or a job transfer. Because it focuses on the more severe cases, many organizations consider it a better indicator of serious safety issues than TRIR alone.
The formula is: DART = (Number of DART Cases × 200,000) ÷ Total Hours Worked. A DART case is any recordable incident where the employee had days away from work, was placed on restricted duty, or was transferred to a different job.
Why Your Rates Matter
Your TRIR and DART rates directly influence your Experience Modification Rate (EMR), which determines your workers’ compensation premiums. A TRIR above your industry average can increase premiums by 20–50% and may disqualify you from contracts that require pre-qualification, particularly in construction, oil & gas, and manufacturing.
OSHA also uses industry rate data to target enforcement inspections. Establishments with rates significantly above their sector’s national average are more likely to be selected for a programmed inspection.
How to Calculate Total Hours Worked
Total hours worked includes all hours actually worked by all employees during the year — including overtime but excluding vacation, sick leave, holidays, and other non-work time. If you don’t track exact hours, OSHA allows you to estimate using the formula: Number of Employees × Average Hours per Week × Weeks Worked. For a quick estimate, multiply your average headcount by 2,000 (the standard full-time equivalent of 40 hours × 50 weeks).