Total Recordable Incident Rate (TRIR) Calculator

The TRIR formula

TRIR = recordable cases × 200,000 ÷ total hours worked. The 200,000 stands for 100 employees working 40 hours a week for 50 weeks, so the rate reads as cases per 100 full-time workers a year, whatever the size of the company. DART rate and the days away rate use the same base with fewer cases.

Worked example: a contractor with an average of 85 employees, 40 hours a week for 50 weeks, worked 170,000 hours. It logged 3 recordable cases: one with days away, one with restricted duty and one treated with stitches and back to work. TRIR = 3 × 200,000 ÷ 170,000 = 3.53. DART = 2 × 200,000 ÷ 170,000 = 2.35. Days away rate = 1 × 200,000 ÷ 170,000 = 1.18.

If the days away case kept the worker off for 12 days, the severity rate is 12 × 200,000 ÷ 170,000 = 14.12 days per 200,000 hours. Use real hours from payroll when you have them; the headcount estimate is for when you do not.

What counts as recordable, in plain words

Under 29 CFR 1904.7 a work-related case goes on the OSHA 300 log if it results in death, days away from work, restricted work or transfer to another job, medical treatment beyond first aid, or loss of consciousness. A significant injury or illness diagnosed by a physician or other licensed health care professional is recordable even without those; the rule names cancer, chronic irreversible disease, a fractured or cracked bone and a punctured eardrum.

First aid is a closed list in 1904.7(b)(5)(ii). It includes a non-prescription medicine at non-prescription strength, a tetanus shot, cleaning a wound, bandages and butterfly strips, hot or cold packs, elastic wraps and other non-rigid supports, eye patches, removing a splinter, a massage and fluids for heat stress. Stitches, staples, rigid splints, prescription medicine and physical therapy are medical treatment, so the case is recordable.

Days away and restricted days are counted from the day after the injury, in calendar days, whether or not the person was scheduled to work, and you may stop counting at 180. This page does not decide whether a case is recordable; the rule and your own records do. It is arithmetic, not legal or medical advice.

Where the numbers come from

Cases come from your OSHA 300 log, summed on Form 300A: column G deaths, H cases with days away, I cases with job transfer or restriction, J other recordable cases, then K and L for the day counts. Total recordable cases are G + H + I + J, DART cases are H + I. Switch to the OSHA 300A columns mode to type them in as they appear.

The 300A also carries the annual average number of employees and the total hours worked by all employees. Under 1904.32 it is posted from February 1 to April 30 of the year after the one it covers. BLS says the hours should be hours actually worked: leave out paid vacation, sick leave and holidays, and estimate from scheduled hours or 8 hours a day for people paid by salary or commission when you have no time records.

Comparing with BLS industry rates

Each year BLS publishes rates from its Survey of Occupational Injuries and Illnesses. Table 1 gives TRIR and DART by industry code; Table 2 gives the same by company size, with quartiles. For 2024 (read on 2026-11-08), Table 1 shows TRIR 2.3 and DART 1.4 for all private industry, 2.2 and 1.3 for construction (NAICS 23) and 2.7 and 1.7 for manufacturing (NAICS 31-33). Look up your own NAICS code there: a sector rate averages many trades, so the rate for your own code is the closer comparison.

Compare the same year, the same case definitions and, where you can, the same size class. With few hours a single case moves the rate a lot: at 48,000 hours, one recordable case alone is a TRIR of 4.17. For a small crew, watch the trend over three years and the number of cases, not one year's rate.

Rates, reports and prevention

The rate is a summary of what already happened. Each event starts with a written record: the incident report template captures what happened, the witnesses and the actions. The job hazard analysis template works before the work starts, step by step with the hazards and controls, and the safety meeting topics generator gives the crew a toolbox talk on what the cases show.

For construction and plant safety teams

Contractors meet TRIR in bids and prequalification forms, sometimes next to DART and the experience modification rate; plants track it in their safety reports. Keep the hours and the case counts on the same dates, recalculate when a case changes category (a restricted case that turns into days away moves from column I to H), and show the trend with the cases behind it, so the number is read as a record and not as a score.

Sources, each read on 2026-11-08. Results are arithmetic on your own numbers, not legal or medical advice:

• BLS, How to compute a firm's incidence rate: cases × 200,000 ÷ hours, what the hours include, the 7-case example
• BLS, SOII Table 1, incidence rates by industry and case type, 2024
• BLS, all nonfatal injury and illness tables (Table 2 by size class, other years)
• 29 CFR 1904.4, recording criteria: work-related, new case, general criteria
• 29 CFR 1904.7, general recording criteria, the first aid list and day counting
• 29 CFR 1904.32, the annual summary (Form 300A): hours, employees, posting dates

Related: the incident report template for each event, the job hazard analysis template before the work, and the safety meeting topics generator for the next toolbox talk.

Related tools

• Incident Report TemplateFill in an incident report for an injury, near miss, damage, vehicle or security incident, with witnesses, root cause and actions, then print or save a PDF.Open the tool
• Job Hazard Analysis TemplateBuild a job hazard analysis: break a task into steps, list the hazards and controls for each, rate the risk, and print or save it as a PDF for the crew.Open the tool
• Safety Meeting Topics GeneratorPick a safety meeting or toolbox talk topic by trade and season, with talking points, crew questions, a sign-in sheet and a 52-week plan.Open the tool