Free OSHA TRIR Calculator (With DART and LTIR)

TRIR stands for total recordable incident rate. It shows how many OSHA-recordable injuries and illnesses a company had for every 100 full-time workers in a year. The formula is recordable cases × 200,000 ÷ total hours worked. The 2024 private-industry average was 2.3.

Key takeaways

• TRIR = recordable cases × 200,000 ÷ hours worked. DART and LTIR use the same formula with fewer cases on top.
• There is no single good number. The 2024 private-industry average is 2.3, but it ranges from under 1 in office-based work to over 4 in warehousing.
• On a small payroll one case moves the rate a lot, so look at three years, not one.
• OSHA doesn't make you calculate TRIR. Your 300A summary does hold both inputs: the case totals and the hours worked.

All three rates work the same way. Only the number of cases on top changes.

• TRIR = (recordable cases × 200,000) ÷ hours worked
• DART rate = (days away, restricted or transferred cases × 200,000) ÷ hours worked
• LTIR = (cases with days away from work × 200,000) ÷ hours worked

TRIR calculation example

A contractor with 90 full-time employees logs 4 recordable cases in a year across 180,000 hours worked. Two of those cases involved days away or restricted duty, and one involved days away from work.

• TRIR: 4 × 200,000 ÷ 180,000 = 4.44
• DART rate: 2 × 200,000 ÷ 180,000 = 2.22
• LTIR: 1 × 200,000 ÷ 180,000 = 1.11

Where the numbers come from

Your case counts come from your OSHA 300 log and the 300A summary. Not sure what belongs on the log? Our guide to the OSHA 300 log and 300A forms explains what counts as recordable and what stays first aid. Take hours worked from payroll. Include overtime and leave out paid time off.

Don't judge the raw number on its own. A 3.1 is a fine year in warehousing and a bad one in an engineering office. Compare it with your industry first, then look at what is driving it.

• Below your industry average. Good, as long as every injury is actually making it onto the log. Under-reporting produces a lovely rate and a real problem.
• Close to the average. Normal. Some customers and insurers screen against the industry figure, so sitting right on it leaves little room.
• Above the average. Pull up your 300 log and sort the cases by task, body part and time of day. Two or three repeat causes usually explain most of the gap.

Compare TRIR with DART too. When DART is close to TRIR, most of your cases were serious enough to cost days away or restricted duty. When DART is far lower, most cases were treatment-only injuries, and simple fixes like better gloves, guarding or housekeeping can move the number quickly.

Why small teams see big swings

Each recordable case adds 200,000 ÷ hours worked to your TRIR. At 180,000 hours (about 90 full-time employees) that is 1.11 points per case. At 40,000 hours (about 20 employees) it is 5.0 points per case. One cut that needed stitches can turn a clean year into a rate that looks alarming. That is why three years of data tells you far more than one.

A good TRIR sits below the average for your industry and keeps dropping year over year. There isn't one number that works everywhere: in 2024, warehousing averaged 4.8 while heavy and civil construction averaged 1.8. Use the table below, or pick your industry in the calculator above.

Average TRIR by industry (2024 BLS data)

Rates per 100 full-time workers, private industry. Source: Bureau of Labor Statistics, Survey of Occupational Injuries and Illnesses, Table 1 (2024). "n/a" means BLS published no figure. Find your exact NAICS code there if it isn't listed.

Two things to watch. Small teams swing hard, because one extra case moves the rate far more at 20 employees than at 200. And a rate that looks too good can mean injuries aren't being reported. Many general contractors ask for your TRIR, DART rate and EMR on prequalification forms, so it pays to get the numbers right.

1. Using headcount instead of hours. The formula wants hours worked. If you only have headcount, multiply average full-time employees by 2,000 and call it an estimate.
2. Counting first-aid cases. Only cases that meet the general recording criteria belong in the numerator. OSHA lists first aid as a closed set of treatments.
3. Leaving out temp workers you supervise. If you direct their work day to day, their cases and their hours are yours (29 CFR 1904.31).
4. Counting paid time off as hours worked.Vacation and sick pay aren't hours on the job. Overtime is.
5. Mixing time periods. Six months of cases over twelve months of hours understates your rate. Use the same window for both.
6. Rounding too early. Calculate with the full numbers and round once at the end.
7. Using the wrong base.OSHA's formula uses 200,000 hours. Some other systems use 1,000,000, so check which one a form is asking for before you enter a number.

TRIR and EMR are different numbers

Your experience modification rate (EMR) is a workers' compensation figure. A rating bureau works it out from your claims history and payroll compared with similar businesses, not from your OSHA log. The same injuries feed both numbers, so they tend to be related, but you can't convert one into the other. This page calculates TRIR, DART and LTIR only. It doesn't estimate EMR.

Owners mix these up all the time, so here they are side by side. None of them is "calculate your TRIR". OSHA doesn't require that, but the records below hold everything you need to do it.

• Who has to keep a log. Employers with 10 or fewer employees at all times during the last calendar year are partially exempt from routine recordkeeping, as are some low-hazard industries (29 CFR 1904.1). Everyone must still report the serious events listed below.
• What gets recorded. Work-related cases involving death, days away, restricted work or transfer, medical treatment beyond first aid, loss of consciousness, or a significant diagnosed injury or illness (1904.7).
• Annual summary. At year end you review the log, total the columns, have a company executive certify the 300A, and post it from February 1 to April 30. The 300A also records your annual average number of employees and total hours worked (1904.32).
• How long you keep records. The 300 log, the 300A and the 301 incident reports are kept for five years after the year they cover (1904.33).
• Electronic submission. Establishments with 250 or more employees that must keep records, and those with 20 to 249 employees in designated industries, submit their 300A data to OSHA by March 2 each year. Establishments with 100 or more employees in a shorter list of industries also submit the 300 and 301 (1904.41).
• Serious-event reporting. Report a work-related death to OSHA within 8 hours. Report an in-patient hospitalization, amputation or loss of an eye within 24 hours (1904.39). This applies to every covered employer, even those exempt from keeping a log.

If you're setting up the paperwork from scratch, start with the full OSHA compliance checklist, then come back here for the math.

There is no trick that brings a rate down. It comes down when fewer people get hurt, which mostly means doing a few ordinary things consistently.

1. Read your own log first. Sort the last three years by task, body part and shift. Fix the repeat offenders before you buy anything.
2. Train on the tasks that actually hurt people. Short, regular sessions beat an annual classroom day. Our guide to employee safety training covers what to include, and the post on how often to run toolbox talks covers the rhythm.
3. Collect near misses and hazards.Every reported hazard is an injury that didn't make the log. See how digital hazard reporting works on a phone, and why it pays for itself.
4. Use restricted duty for the right reason.Suitable modified work helps people recover. It also changes how a case is classified: it counts toward DART but not toward days away, so it lowers LTIR without touching DART or TRIR. Do it because it's good for the employee, not to move a number.
5. Keep reporting honest. A rate that falls because injuries went unrecorded is a liability, not a result.

• Formula. (cases × 200,000) ÷ hours worked, for TRIR, DART and LTIR. This is the standard incident-rate formula based on 100 full-time workers.
• Estimate mode. If you enter employees instead of hours, the calculator multiplies full-time headcount by 2,000 hours. Part-time and seasonal staff make that figure less accurate.
• Industry averages. Taken from the BLS Survey of Occupational Injuries and Illnesses (2024), private industry, per 100 full-time workers. Rows were checked against the published table on October 4, 2026, and will be refreshed when BLS releases its next year of data.
• Regulations. Quoted from 29 CFR Part 1904 as published in the eCFR and checked on October 6, 2026.
• Limits. Industry averages cover establishments of every size, so they are a reference point, not a pass mark. This page is general information, not legal advice. For a specific recording decision, check the standard itself or ask your OSHA area office.

Also explore