Total Recordable Case Rate (TRC): Calculation, Interpretation, and Benchmarking

Total Recordable Case Rate (TRC) (often called TRIR – Total Recordable Incident Rate) is a standardized OSHA metric quantifying workplace injury/illness frequency.

Formula

TRC = (Number of OSHA Recordable Cases × 200,000) ÷ Total Employee Hours Worked

• 200,000 = 100 full-time employees × 40 hrs/week × 50 weeks (standardized exposure base).
• Recordable Cases: Death, days away, restricted work/job transfer, medical treatment beyond first aid, loss of consciousness, significant diagnosed injury/illness (per 29 CFR 1904).
• Hours Worked: All hours (regular, overtime) for all employees during the period—exclude leave, non-work time.

Example

10 recordable cases ÷ 1,200,000 hours × 200,000 = 1.67 per 100 FTE/year.

Interpretation & Use

• Trend Tracking: Monthly/quarterly/annual trends reveal program effectiveness.
• Benchmarking: Compare to BLS industry NAICS rates (e.g., Construction 2021: 3.1; Manufacturing: 3.3; Healthcare: 4.0).
• Leading vs. Lagging: TRC is lagging; pair with leading indicators (near-miss reports, safety observations, training completion, hazard abatement rates).
• Limitations: Underreporting, varying case definitions, doesn’t capture severity. Supplement with DART rate (Days Away/Restricted/Transfer) and severity rate.

Regulatory Context

• OSHA 300 Log posting (Feb 1 – Apr 30).
• Severe injury reporting: fatality ≤8 hrs; inpatient hospitalization, amputation, eye loss ≤24 hrs.
• High-rate employers may trigger programmed inspections.

TRC is a vital dashboard metric—but safety culture is built on daily conversations, not just annual numbers.