Total Recordable Incident RateTRIR

TRIR = (recordable cases × 200,000) / hours worked. OSHA uses 200,000 as the normalising constant (100 full-time-equivalent workers × 2,000 hours per year). It is the single most-cited safety metric in the industry and the one a customer or a regulator asks for first, but it is a lagging indicator — it measures what already happened, not what is about to. A TRIR of 0 is not a safe site; it is a site with no recordable cases in the window, which can mean excellent control or under-reporting.

A recordable case under OSHA 29 CFR 1904.7 is a work-related injury or illness that results in death, days away from work, restricted duty or job transfer, medical treatment beyond first aid, or loss of consciousness. The first-aid list in 1904.7(b)(5)(ii) is what separates a treatable case from a recordable one. TRIR is comparable across employers because the numerator and the denominator are defined, but it flattens severity — a cut finger and a fatality each count as one recordable case, which is why DART and LTIR exist alongside it. For the related rates, see LTIR and DART; for the leading measures that move it, see leading indicator.