TRIR Calculator
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Maintaining a safe workplace is both a moral duty and a regulatory requirement. In the United States, the Occupational Safety and Health Administration (OSHA) and commercial insurance underwriters evaluate a company’s historical safety record using the Total Recordable Incident Rate (TRIR), also known as TCIR (Total Case Incident Rate).
Our free TRIR Calculator allows EHS (Environmental Health and Safety) managers, general contractors, and business owners to measure workplace safety performance. By standardizing injuries against total employee hours worked, you can monitor safety trends, bid on commercial contracts, and maintain OSHA compliance.
How to Calculate TRIR (OSHA Incident Rate)
TRIR calculates the number of OSHA-recordable injuries and illnesses occurring per 100 full-time workers over a one-year period.
The Official OSHA TRIR Formula:
TRIR = (Number of OSHA Recordable Incidents × 200,000) / Total Employee Hours Worked
- OSHA Recordable Incidents: Total work-related injuries or illnesses recorded on your OSHA Form 300 Log (requiring medical treatment beyond basic first aid, restricted work, lost days, or loss of consciousness).
- 200,000 Multiplier: The standard benchmark representing 100 full-time workers working 40 hours per week for 50 weeks (100 × 2,000 hours).
- Total Hours Worked: The actual cumulative hours logged by all full-time, part-time, temporary, and seasonal employees during the measurement year.
TRIR Safety Score Tiers & Industry Benchmarks
A lower TRIR score represents a safer workplace environment. Commercial general contractors often require subcontractors to hold a TRIR below specific threshold limits to bid on jobs:
| TRIR Score Range | Safety Performance Grading | Commercial Impact |
|---|---|---|
| Below 3.0 | Excellent / Top Tier | Beats national averages; qualifies for major enterprise & government contract bids. |
| 3.0 to 4.0 | Average National Benchmark | Matches general US industry baseline across manufacturing and warehousing. |
| Above 4.0+ | Poor / High Risk | Triggers higher workers’ comp insurance premiums and potential OSHA inspections. |
Step-by-Step EHS Calculation Example
Imagine a manufacturing plant with 75 full-time employees logging a total of 150,000 total hours worked over the past year.
- The plant logged 3 OSHA-recordable injuries (e.g., 2 lacerations requiring stitches and 1 repetitive strain injury).
Let’s calculate the TRIR score:
TRIR = (3 Incidents × 200,000) / 150,000 Hours
TRIR = 600,000 / 150,000 = 4.00
The manufacturing plant has a TRIR of 4.00, indicating that for every 100 full-time workers, exactly 4 recordable incidents occurred during the year.
Frequently Asked Questions (FAQ)
What is the difference between TRIR and DART Rate?
TRIR (Total Recordable Incident Rate) includes all recordable injuries and illnesses requiring medical treatment beyond first aid. DART Rate (Days Away, Restricted, or Transferred) only counts severe incidents that caused employees to miss work days, work with restrictions, or transfer job duties. DART is a subset of TRIR.
What injuries are NOT included in TRIR?
Minor injuries requiring only basic first aid (such as cleaning minor cuts, applying bandages, taking over-the-counter pain medications at non-prescription strength, or applying cold compresses) are strictly excluded from OSHA recordables and do not count toward TRIR.
Do contractor hours count toward TRIR?
If independent contractors are directly supervised on a day-to-day basis by your company management, their working hours and injuries must be included in your company’s OSHA 300 log and TRIR calculation.