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How to Calculate TRIR: Formula & Industry Averages
Learn how to calculate your Total Recordable Incident Rate (TRIR), what the OSHA formula is, and what a good TRIR score means for contractors.
Safety Evolution
Jan 23, 2023
Last updated: April 2026
⚡ Quick Answer
- TRIR formula: (Recordable incidents × 200,000) ÷ total hours worked.
- The 200,000 constant represents 100 full-time workers at 40 hours per week for 50 weeks.
- TRIR is useful only when incident classification and hours data are accurate and consistent.
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TRIR is one of the most cited safety performance metrics in construction, industrial, and energy contracting. It is also one of the most misused. Teams often compare numbers without validating recordability logic, contractor hours inclusion, or classification consistency.
What TRIR Measures
Total Recordable Incident Rate estimates the number of OSHA-recordable incidents per 100 full-time workers over one year. It standardizes incident experience across companies of different sizes.
TRIR is a lagging indicator. It shows outcome history, not future risk by itself. Use it with leading indicators such as inspection completion, action closure speed, and high-risk competency checks.
TRIR Formula and Calculation Steps
Formula: (Number of recordable incidents × 200,000) ÷ total hours worked
- Count recordable incidents for the selected period.
- Calculate total hours worked in the same period.
- Multiply recordables by 200,000.
- Divide by total hours worked.
Example: 6 recordables and 420,000 hours worked gives TRIR = (6 × 200,000) ÷ 420,000 = 2.86.
Recordable Incident Classification Rules
TRIR quality depends on consistent incident classification. Overstating or understating recordables breaks trend integrity and weakens leadership decisions.
- Use one documented decision framework for recordability.
- Train supervisors and safety staff on classification criteria.
- Run monthly case review for borderline events.
- Keep incident logs and supporting records audit-ready.
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Start Your 30-Day Free Trial →Industry Averages and Benchmark Caution
Benchmarking can help, but only when scope and data rules match. Compare by industry segment, work type, and workforce profile. A pipeline contractor and a light-commercial interior contractor should not expect identical baseline rates.
When sharing TRIR externally, state period, hours basis, and recordability framework used.
How to Use TRIR in Monthly Leadership Reviews
- Trend TRIR over rolling 12-month windows.
- Pair TRIR with severity indicators and lost-time metrics.
- Map repeat incident categories to control failures.
- Track closure cycle time for corrective actions tied to recordables.
Canada vs US Reporting Context
US-based organizations commonly anchor TRIR to OSHA recordable criteria. Canadian contractors may still use TRIR internally for consistency across North American reporting, but should clearly document the classification standard used in each report.
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Start Your 30-Day Free Trial →Frequently Asked Questions
What is a good TRIR for construction?
There is no universal good number. Benchmark by work type, region, and reporting method, then target sustained improvement and lower severity over time.
Why does TRIR use 200,000?
The 200,000 constant standardizes incident rates to 100 full-time workers over one year for comparable reporting.
Should contractor hours be included?
Include hours consistently according to your reporting scope. Inconsistent inclusion makes trend and benchmark comparisons unreliable.
Is TRIR enough to assess performance?
No. TRIR is lagging. Pair it with leading indicators such as inspection completion, corrective action closure time, and competency validation rates.
How often should we calculate TRIR?
Monthly trend reviews are common, with rolling 12-month tracking to smooth volatility and support leadership decisions.