TRIR stands for Total Recordable Incident Rate, and it’s the most widely used metric for measuring workplace safety performance in the United States. It captures how many work-related injuries and illnesses a company experiences per 100 full-time employees over the course of a year. A lower number means fewer incidents; a higher number signals more frequent safety problems. Companies, contractors, and regulators all use TRIR to compare safety records across worksites, industries, and time periods.
How TRIR Is Calculated
The formula is straightforward:
(Number of recordable incidents × 200,000) ÷ Total hours worked by all employees = TRIR
The 200,000 in the formula isn’t arbitrary. It represents the total hours 100 employees would work in a year if each worked 40 hours a week for 50 weeks. This standardized base lets you make fair comparisons between a 50-person company and a 5,000-person company, because the rate is always expressed per 100 workers.
For example, if a company with 250 employees logs 500,000 total work hours in a year and records 3 incidents, the calculation is (3 × 200,000) ÷ 500,000 = 1.2. That means roughly 1.2 recordable incidents occurred for every 100 full-time workers.
What Counts as a Recordable Incident
Not every workplace injury makes it into the TRIR count. OSHA draws a clear line between incidents that require recording and those classified as first aid. An incident is recordable if it results in any of the following: death, days away from work, restricted duties or a job transfer, medical treatment beyond first aid, or loss of consciousness. Certain diagnoses are always recordable regardless of treatment, including fractures, punctured eardrums, cancer, and chronic irreversible diseases.
The definition of “first aid” is specific. Treatments that stay on the first-aid side of the line include using over-the-counter medications at standard strength, administering tetanus shots, applying eye patches, removing splinters with tweezers, draining a blister, using finger guards, and drinking fluids for heat stress. The moment treatment crosses into prescription-strength medication, physical therapy, chiropractic care, or stitches, it becomes recordable.
One detail that trips up many employers: a visit to a doctor for observation or diagnostic tests like X-rays doesn’t automatically make an incident recordable. It only becomes recordable when the provider prescribes medical treatment beyond first aid or when the injury itself qualifies (like a confirmed fracture found on that X-ray).
Industry Benchmarks for 2024
TRIR varies significantly by industry because some types of work carry inherently higher physical risk. Bureau of Labor Statistics data for 2024 shows these total recordable case rates per 100 full-time workers:
- Manufacturing: 2.7
- Construction: 2.2
- Mining, quarrying, and oil and gas extraction: 1.2
These numbers serve as the baseline when evaluating whether a specific company’s rate is above or below the norm for its sector. A construction firm with a TRIR of 1.0 is performing well relative to its peers, while a TRIR of 4.0 would raise red flags. Companies bidding on contracts, especially in oil and gas or large-scale construction, are routinely asked to provide their TRIR, and a rate above the industry average can disqualify them.
TRIR vs. DART Rate
TRIR is often discussed alongside another metric called the DART rate (Days Away, Restricted, or Transferred). While TRIR captures every recordable incident, DART narrows the focus to only those incidents serious enough to keep someone from doing their normal job. If a worker needs stitches but returns to full duty the next day, it counts toward TRIR but not DART. If they miss three days of work or get moved to lighter tasks, it counts toward both.
Think of TRIR as the wide-angle lens showing overall incident volume, and DART as the zoom lens revealing how many of those incidents actually disrupted operations. Tracking both gives a more complete picture. A company with a low TRIR but a DART rate that’s nearly as high has fewer incidents overall, but the ones that do happen tend to be serious.
Why TRIR Matters Beyond Compliance
OSHA requires most employers to keep injury and illness records, and recent rule changes have expanded electronic reporting obligations. Establishments with 100 or more employees in designated high-hazard industries must now submit detailed information from their injury logs and incident reports to OSHA electronically by March 2nd each year. Smaller establishments (20 to 249 employees) in certain industries submit an annual summary. This data becomes part of a company’s public safety profile.
TRIR also carries real financial weight. While it doesn’t directly set your workers’ compensation premiums the way an Experience Modifier Rate (EMR) does, insurance underwriters look at TRIR when making qualitative assessments. A company with a consistently high incident rate may face higher costs or more scrutiny at renewal. More immediately, clients and general contractors use TRIR as a gatekeeper. In industries like energy, petrochemical, and heavy construction, you often can’t get on a job site if your TRIR exceeds a certain threshold.
Limitations of Relying on TRIR Alone
TRIR is a lagging indicator, meaning it only tells you what already went wrong. It can’t predict where the next incident will come from. OSHA itself cautions that relying on a single metric can lead to wrong conclusions and recommends pairing lagging indicators like TRIR with leading indicators, such as safety training completion rates, near-miss reports, and hazard inspections.
There’s also a well-known incentive problem. Because a lower TRIR looks better on paper, some workplaces develop a culture of discouraging injury reporting or steering treatment toward first-aid classifications to keep incidents off the books. This doesn’t make the workplace safer; it just makes the number look better while masking real hazards. A genuinely useful safety program tracks TRIR honestly while also measuring the proactive steps being taken to prevent incidents in the first place.