OSHA Incident Rate (TRIR & DART) Calculator

TRIR measures the number of OSHA-recordable injuries and illnesses per 100 full-time workers (200,000 labor-hours) per year: TRIR = (Recordable Cases × 200,000) / Total Labor-Hours.

DART measures workplace injuries resulting in Days Away, Restricted work, or Job Transfer per 200,000 labor-hours: DART = (DART Cases × 200,000) / Total Labor-Hours.

The 200,000-hour factor represents the equivalent hours worked by 100 full-time employees working 40 hours per week for 50 weeks in a calendar year.

According to BLS national safety statistics, the average TRIR for non-residential construction is approximately 2.4 to 2.8. A TRIR below 2.0 is considered strong safety performance.

OSHA 29 CFR 1904 governs Recording and Reporting Occupational Injuries and Illnesses.

Owners and general contractors use TRIR thresholds (often requiring TRIR < 3.0 or < 2.0) during pre-qualification. High TRIR rates increase worker compensation Experience Modification Rates (EMR).

TRIR includes all recordable injuries (medical treatment beyond first aid), whereas DART isolates more severe cases involving missed workdays, job restrictions, or job transfers.

Subcontractor hours and injuries are recorded on the subcontractor's OSHA 300 log unless the general contractor day-to-day supervises subcontractor employees.

TRIR = (Total Number of OSHA Recordable Injuries & Illnesses × 200,000) / Total Employee Hours Worked.

The 200,000 constant represents the benchmark annual hours worked by 100 full-time equivalent (FTE) employees (100 workers × 40 hrs/wk × 50 wks/yr).

DART (Days Away, Restricted, or Transferred) Rate = [(Number of DART Cases) × 200,000] / Total Employee Hours Worked.

An injury is recordable if it results in death, days away from work, restricted work duty, medical treatment beyond first aid, or loss of consciousness.

First aid includes using non-prescription medication, tetanus immunizations, cleaning superficial wounds, band-aids, butterfly bandages, and temporary splints.

LWCR calculates cases involving days away from work only: LWCR = [(Cases with Days Away) × 200,000] / Total Hours Worked.

Contractors evaluate subcontractor safety performance using TRIR benchmarks; a TRIR below 3.0 (or below industry average) is typically required for project bidding qualification.

EMR is a worker's compensation insurance rating factor based on 3-year loss history (1.0 is average). High TRIR leads to high EMR and higher insurance premiums.

OSHA requires reporting any work-related fatality within 8 hours, and any in-patient hospitalization, amputation, or loss of an eye within 24 hours.

In small companies (< 20 workers), a single recordable incident can spike TRIR artificially high (e.g., 5.0 to 10.0), which is why 3-year rolling averages are preferred.