What Is RIR?
Definition and formula for the recordable incident rate. Confirm the requested name and hours base.
Quick definition
RIR stands for Recordable Incident Rate. RIR is commonly used for a total-recordable incidence rate calculated with the 200,000-hour base. TRIR and TCIR are often used for the same calculation. RTIR appears in some searches as an inconsistent spelling or transposition of those abbreviations. Confirm the requested definition and hours base before you report a number.
RIR formula
RIR = (Number of recordable cases × 200,000) ÷ Total hours worked
As with TRIR, 200,000 represents 100 full-time workers for a year (40 hours × 50 weeks × 100 employees).
Why the different names
OSHA uses the phrase "incidence rate" in its instructions. Industry, insurers, and owners adopted their own labels, and abbreviations get shortened or transposed in searches and conversation. If a form asks for RIR, TRIR, TCIR, or "recordable rate", ask which formula and hours base they want. Some forms use a 1,000,000-hour base instead of 200,000.
Calculate yours
Use our free TRIR and DART calculator or compare against a benchmark with the TRIR industry average calculator. If you are managing several sites, read how to roll up TRIR across projects so you combine hours and cases correctly.