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TRIR Calculator (Total Recordable Incident Rate)

TRIR is the number of OSHA recordable cases per 100 full-time workers in a year. Enter the case counts from your OSHA 300A summary and the hours your employees actually worked, and this calculator runs the formula OSHA itself uses: cases multiplied by 200,000, divided by hours worked. It also shows what one more case would cost you.

Work-related fatalities recorded for the year. Rarely anything but zero — but a fatality is a recordable case and belongs in the total.
Cases where the employee missed at least one full calendar day after the day of the injury (1904.7(b)(3)).
Restricted work or transfer, but no days away. A restriction only on the day of the injury is not recordable as restricted work (1904.7(b)(4)(iii)).
Medical treatment beyond first aid, loss of consciousness, a significant diagnosis — with no days away and no restriction.
hours
Actual hours worked, including overtime. Vacation, sick leave and holidays do not count, even if they were paid.
Your NAICS rate from the BLS tables, or your corporate target. Pre-filled with 2.4, the all-industry figure OSHA publishes for 2023. Enter 0 to skip the comparison.

Rates and totals are calculated only from the numbers you type, so they are only as good as your OSHA 300 Log. This page is not an OSHA form, is not submitted to anyone, and does not decide whether a case is recordable — that follows 29 CFR Part 1904 and, in a State Plan state, your state's own rule. Nothing you type is sent to our servers.

Where each number comes from

Everything this calculator needs is already on the OSHA 300A summary you post every February. The four case boxes are the ones that add up to your total recordable cases — every case appears in exactly one of them, chosen on its most serious outcome.

The four case columns of OSHA Form 300A
BoxWhat it countsIn TRIR?
GTotal number of deathsYes
HCases with days away from workYes — and these are also DART cases
ICases with job transfer or restrictionYes — also DART cases
JOther recordable cases (medical treatment beyond first aid, loss of consciousness, a significant diagnosis)Yes — and this is the box people forget
K and LTotal days away and days of transfer or restrictionNo — days never enter a case-based rate

Hours worked are hours your employees actually worked, overtime included, taken from payroll. Vacation, sick leave and holidays are excluded even when they were paid — OSHA publishes an optional worksheet for estimating the figure when you only keep hours paid.

A worked example

A specialty contractor with about 125 people on the payroll works 250,000 hours in a calendar year. Its 300A shows no fatalities, 2 cases with days away, 1 case with restricted duty and 4 other recordable cases: 7 recordable cases.

TRIR = (7 × 200,000) ÷ 250,000 = 5.6 recordable cases per 100 full-time workers. The same summary gives a DART rate of (3 × 200,000) ÷ 250,000 = 2.4, because only columns H and I count there. And each additional case in that year would have added 200,000 ÷ 250,000 = 0.8 to the TRIR — which is why a contractor of this size can move a full point on two slips in a wet December.

Comparing your rate with anything

  • Compare within your industry and your size. OSHA's 2016 letter of interpretation makes the point directly: BLS publishes rates in five establishment-size categories because a single case has a much greater effect on a small establishment's rate than on a large one's. Take the rate for your NAICS code at the most precise level available.
  • The only broad national figure OSHA publishes is 2.4 incidents per 100 workers in 2023, down from 10.9 in 1972. It is a useful order of magnitude and nothing more — a roofing crew and an insurance office are both in it.
  • Small numbers, several years. For a small employer, OSHA suggests aggregating several years of cases and hours together, keeping the 200,000 constant unchanged. A three-year rate on 90,000 hours says something; a one-year rate on 30,000 hours mostly says whether anyone got hurt.
  • Say what you counted. A rate without its case count and hours is not verifiable. Prequalification questionnaires that ask for TRIR usually ask for both, and for three years of them.

What TRIR does not tell you

TRIR counts cases, not consequences. A fatality and a stitched finger both add one case. An establishment that sends people back on restricted duty the same afternoon and one that sends them home for three months can post the same number. Read it next to your DART rate, which counts the cases that took someone off the job, and your day counts, which say how long.

It also says nothing about exposure. A low TRIR in a year where nothing happened to go wrong is a lagging indicator with a small sample behind it. The things that move it are upstream: the hazards found on a job hazard analysis, the ones caught at the morning huddle, and the ones nobody wrote down.

How it's calculated

Total recordable cases
cases = column G + column H + column I + column J
Every recordable case is counted once, in exactly one of the four case columns of the OSHA 300A summary.
TRIR (total recordable incident rate)
TRIR = (cases x 200,000) / hours worked
OSHA's own wording: (Number of injuries and illnesses X 200,000) / Employee hours worked = Incidence rate.
What 200,000 is
200,000 = 100 employees x 40 hours/week x 50 weeks/year
The base for 100 full-time-equivalent workers, so that a 12-person crew and a 4,000-person plant can be compared on the same scale.
Full-time equivalents behind your hours
FTE = hours worked / 2,000
2,000 hours is the full-time work year the 200,000 base assumes (40 x 50). It is what makes a TRIR readable as cases per 100 workers.
What one more case would cost
rate per case = 200,000 / hours worked
Below roughly 200,000 hours worked, a single recordable case moves the rate by more than a full point — the reason OSHA warns that one case has a much greater effect on a small establishment's rate.
Percent above or below an industry average
percent = ((your rate - industry rate) / industry rate) x 100
The comparison OSHA asks VPP applicants to make against the BLS rate for their NAICS code.

Frequently asked questions

Add up every OSHA recordable case for the year, multiply by 200,000, and divide by the total hours your employees actually worked. OSHA states the formula in its 2016 letter of interpretation as (Number of injuries and illnesses X 200,000) / Employee hours worked = Incidence rate. Example: 7 recordable cases and 250,000 hours worked gives (7 x 200,000) / 250,000 = 5.6.

It is the number of hours 100 employees working 40 hours a week, 50 weeks a year would work. Using it as the base turns the answer into cases per 100 full-time workers, so a 15-person contractor and a 3,000-person plant can be compared on the same scale. Nothing about the number changes if your people work 45 hours a week or 48 weeks a year — the base stays 200,000.

Every case recorded on the OSHA 300 Log: fatalities, cases with days away from work, cases with job transfer or restriction, and other recordable cases. On the 300A summary those are columns G, H, I and J, and each case appears in exactly one of them. A case is recordable when it is work-related and results in death, days away from work, restricted work or transfer, medical treatment beyond first aid, loss of consciousness, or a significant injury or illness diagnosed by a physician or other licensed health care professional (29 CFR 1904.7).

Hours your employees actually worked, including overtime, and including hours worked by part-time, temporary and seasonal workers. Vacation, sick leave and holidays are excluded even when they were paid. If you only keep hours paid, OSHA's recordkeeping package includes an optional worksheet that estimates hours worked from the number of full-time employees times the annual work hours, plus overtime and other workers' hours.

There is no OSHA threshold that makes a rate good or bad — a rate is only meaningful against the average for your industry and establishment size. The one national figure OSHA publishes is broad: 2.4 incidents per 100 workers in 2023, down from 10.9 in 1972. For a real comparison, use the BLS incidence rate tables for your NAICS code, at the most precise level available, and compare like sizes with like.

No. TRIR counts every recordable case. The DART rate counts only the more serious subset — cases with days away from work, restricted work or job transfer, which are columns H and I of the 300A. Both use the same 200,000-hour base, so DART is always lower than or equal to TRIR for the same period. OSHA's site-specific targeting program selects establishments for inspection on their DART rate, not on TRIR.

Because the rate divides by your hours. Each recordable case is worth 200,000 divided by your hours worked: at 250,000 hours a case adds 0.8 points, at 40,000 hours it adds 5.0 points. OSHA makes exactly this point in its 2016 letter of interpretation, and suggests that small employers aggregate several years of cases and hours — keeping the 200,000 constant unchanged — to get a rate that is stable enough to compare.

No. Part 1904 requires you to keep the log, total the columns, certify the summary and post it from February 1 to April 30 — it does not require you to compute a rate. Rates are calculated by OSHA from the 300A data you submit, and by you when a client, an insurer, a prequalification questionnaire or a VPP application asks. Employers with 10 or fewer employees company-wide, and establishments in partially exempt industries, do not keep the log in the first place — although every employer still reports a fatality, in-patient hospitalization, amputation or loss of an eye under 1904.39.

Sources & references

Content checked against these sources — last reviewed August 28, 2026.

By — Editorial team of SteelToeTools.com (published by LSEA SAS) Updated v1