TRIR / TRIFR Calculator
Formula Reference
TRIR = (Number of Recordable Incidents × Base Hours) ÷ Total Hours Worked| OSHA (US) | 200,000 hrs base (100 FTE / yr) |
| ISO / Global | 1,000,000 hrs base |
| UK / RIDDOR-style | 100,000 hrs base |
Methodology, interpretation & sources
Purpose. Calculate your Total Recordable Incident Rate (TRIR) — also referred to as Total Recordable Injury Frequency Rate (TRIFR) depending on the standard used — to benchmark your site's or organization's recordable injury/illness performance against a standardized exposure base.
How to use the result. Start with source data you can verify, enter values on a consistent unit and time basis, and record the assumptions used. The main inputs on this page include Reporting Standard / Base Hours Determines the standardization multiplier used in the formula., Number of Recordable Incidents Total OSHA/company-recordable injuries & illnesses in the period., Total Hours Worked Total exposure hours by all employees in the same period., Your Name, Email, Company Name. Re-run the calculation when those assumptions change rather than carrying an old result forward.
Decision use. Use this calculator to standardize a safety-performance indicator from your own verified incident and exposure data. Consistent definitions are essential when comparing sites or time periods.
Limitations. Confirm that the numerator event definition and denominator exposure-hours basis match the reporting framework used by your organization or regulator.
Primary references. Use the current edition/version that applies to your jurisdiction and organization:
Editorial note. Prepared and maintained by Impact Tech Solutions. Editorially updated 28 September 2026. No individual professional credential is claimed on this page; high-consequence, statutory, tax, engineering or health decisions should be independently verified against the current primary source and, where required, a qualified professional.