1. What is TRIR?
TRIR — Total Recordable Incident Rate — is an occupational safety metric that quantifies the frequency of recordable incidents within an organisation, normalized against hours worked. In practical terms: it allows meaningful comparison of safety performance between organisations of different sizes, removing the distortion of scale.
The metric was developed by OSHA (Occupational Safety and Health Administration), the United States federal agency responsible for workplace safety regulation, under 29 CFR Part 1904. Its original purpose was to build a national dataset enabling government bodies to monitor trends in occupational injuries and illnesses by industry sector.
Over time, TRIR extended well beyond its US regulatory origins and became the de facto benchmark for EHS teams worldwide — including organizations operating under ISO 45001, the EU Framework Directive on Safety and Health (89/391/EEC), the UK's Health and Safety at Work Act 1974, and RIDDOR 2013. Today, it is used in supplier audits, pre-qualification processes, public procurement, and ESG sustainability reporting across Europe, the Middle East, Asia-Pacific, and beyond.
2. Why does TRIR matter?
For the EHS Manager
TRIR is the common language of safety. It enables external benchmarking — comparing the organization's performance against sector averages — and internal benchmarking — identifying trends over time or differences between operational sites. It is also the primary indicator required in safety management system audits conducted under ISO 45001, and in pre-qualification processes for industrial clients in sectors such as Oil & Gas, utilities, and construction.
For the C-Suite and CFO
TRIR has direct financial consequences. Organizations with persistently high TRIR face higher employers' liability insurance premiums, increased exposure to regulatory enforcement, and reputational risk in procurement and investor relations. The indicator is increasingly incorporated into ESG reports and scrutinised by institutional investors and sustainability rating agencies. A TRIR materially above the sector average may be interpreted as a systemic governance risk.
For HR and Operations
Organizations with lower TRIR tend to report lower workforce turnover and greater attractiveness to skilled workers — particularly in industrial sectors where safety record is a significant retention factor. For operations, TRIR functions as a proxy for the effectiveness of safe working procedures: a sudden increase in the indicator is frequently the earliest signal of operational deterioration.
3. Formula and how to calculate it
The TRIR formula is:
TRIR = (Number of recordable incidents x 200,000) / Total hours worked
.webp)
What does 200,000 represent?
The 200,000 constant represents the number of hours 100 full-time employees would work in one year, assuming 40 hours per week and 50 working weeks (100 x 40 x 50 = 200,000). It serves as the normalization factor: regardless of the size of the organization, TRIR always expresses the number of incidents per equivalent of 100 full-time workers per year.
Step-by-step example
A manufacturing company with 450 employees recorded 9 recordable incidents during the year. Total hours worked over the period were 900,000.
TRIR = (9 x 200,000) / 900,000 = 1,800,000 / 900,000 = 2.0
What to include in total hours worked
All hours actually worked by directly employed staff should be counted: standard hours, overtime, night shifts, and weekend work. Agency workers and contractors under direct supervision should also be included, provided the organization controls their working conditions.
What NOT to include
Annual leave, sick leave, training conducted off-site, maternity and paternity leave, and hours worked by contractors operating autonomously under their own employer's responsibility should not be counted.
Common calculation errors
The most frequent mistake is understating the denominator — incorrectly excluding hours worked by agency workers or supervised contractors. The practical effect is artificially inflating TRIR. The second most common error is misclassifying incidents: treating as first aid situations that should be recorded as requiring medical treatment beyond first aid.
4. Interactive Calculator
5. What is a good TRIR? Industry benchmarks
There is no universally 'good' TRIR value — what matters is comparison against the sector average. The benchmarks below are drawn from two complementary sources: the US Bureau of Labor Statistics (BLS), the most widely referenced source for global TRIR benchmarking, and the UK Health and Safety Executive (HSE).
A note on methodology: BLS and HSE data are not directly interchangeable. BLS reports TRIR per 100 FTE workers using OSHA's recordability criteria. HSE reports non-fatal injury rates per 100,000 workers under RIDDOR 2013, which applies more restrictive thresholds. Direct numerical comparison across these frameworks should be approached with caution.
BLS benchmarks — global reference (TRIR format):