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DART and TRIR rate calculator
Both rates are the same piece of arithmetic: take the number of cases, multiply by 200,000, and divide by the hours your employees actually worked. DART counts only the cases that cost days away from work, restricted duty, or a job transfer. TRIR, the total recordable incident rate, counts every recordable case on the OSHA 300 log. Dividing by the 200,000 hour base is what turns both into a rate per 100 full-time employees, so a 10-person site and a 900-person site can be read on the same scale.
Every case on the log for the period.
OSHA 300 columns H + I + J
The subset with days away from work, restricted duty, or a job transfer.
OSHA 300 columns H + I
Hours actually worked over the same period. Not scheduled hours, and not vacation or sick leave.
Fill in all three numbers to see a rate.
How it is calculated
OSHA states the formula as: (Number of injuries and illnesses x 200,000) / Employee hours worked = Incidence rate. The same formula produces both rates; only the case count changes.
- DART counts columns H and I only: days away from work, and restricted work or job transfer.
- TRIR, which OSHA's own data pages call the Total Case Rate, counts every case on the OSHA 300 log: columns H, I, and J together.
- 200,000 is the number of hours 100 employees working 40 hours a week, 50 weeks a year would work. That is why a rate reads as cases per 100 full-time employees per year.
Hours worked means hours actually worked. Vacation, sick leave, and holidays are not hours worked, and including them understates the rate.
Source: OSHA, Establishment Specific Injury and Illness Data, Rate Calculation. Read 15 September 2026. If OSHA changes the page, this one changes with it.
Source: OSHA letter of interpretation, 23 August 2016, on the 200,000 hour base. Read 15 September 2026. If OSHA changes the page, this one changes with it.
Source: OSHA recordkeeping forms package, Form 300A worksheet on total hours worked. Read 15 September 2026. If OSHA changes the page, this one changes with it.
The industry rates on this page are BLS figures for 2024, the latest year published when they were copied. BLS publishes a new year of data annually, so check the BLS injury and illness incidence rate comparison tool for the current figures for your own NAICS code. This calculator is informational and does not replace your recordkeeping obligations under 29 CFR Part 1904.
How to calculate a DART rate
Take one establishment's year. Its OSHA 300 log has 1 case in column H (days away from work), 2 cases in column I (job transfer or restriction), and 2 cases in column J (other recordable cases). Its employees, plus the temporary workers it supervises day to day, actually worked 180,000 hours.
- Count the DART cases. Column H plus column I: 1 + 2 = 3.
- Multiply by 200,000. 3 x 200,000 = 600,000.
- Divide by hours worked. 600,000 / 180,000 = 3.33. That is the DART rate: about 3.33 cases with days away, restricted work or a job transfer for every 100 full-time employees.
- TRIR from the same log. Columns H, I and J together give 5 recordable cases, and (5 x 200,000) / 180,000 = 5.56.
Type the same three numbers into the calculator above and it returns the same two rates. Use hours actually worked for the same period as the log: a year of cases over a quarter of hours reads four times too high.
What is a good DART rate?
Compare your rate with the rate BLS publishes for your industry. These are the 2024 Survey of Occupational Injuries and Illnesses figures for private industry and for warehousing and the industries around it, as cases per 100 full-time workers. For any other industry, look up your NAICS code in the BLS incidence rate comparison tool.
| Industry (NAICS) | DART | Total recordable |
|---|---|---|
| Private industryAll private industry | 1.4 | 2.3 |
| Warehousing and storageNAICS 493 | 4.1 | 4.8 |
| General warehousing and storageNAICS 49311 | 4.3 | 4.9 |
| Couriers and messengersNAICS 492 | 6.6 | 8.0 |
| Truck transportationNAICS 484 | 2.2 | 2.9 |
| General freight truckingNAICS 4841 | 2.4 | 3.1 |
| Merchant wholesalers, durable goodsNAICS 423 | 1.2 | 1.8 |
| Merchant wholesalers, nondurable goodsNAICS 424 | 2.4 | 3.1 |
DART and TRIR questions
- What is a DART rate?
- DART stands for days away, restricted, or transferred. The DART rate is the number of cases recorded in columns H and I of the OSHA 300 log (days away from work, and job transfer or restriction), multiplied by 200,000 and divided by the hours all employees actually worked. OSHA's own data pages call it the Days Away, Restriction, and Transfer (DART) Rate. The 200,000 is the hours 100 employees working 40 hours a week, 50 weeks a year would work, so the result reads as cases per 100 full-time employees per year.
- DART vs TRIR: what is the difference?
- Both use the same formula and the same hours worked; only the case count changes. TRIR, which OSHA's data pages call the Total Case Rate, counts every case on the OSHA 300 log: columns H, I and J. DART counts columns H and I only, so it leaves out the other recordable cases in column J, the ones that involved neither days away from work nor restricted work or a job transfer. That is why a DART rate can equal the TRIR but can never be higher than it.
- Do job transfers and restricted duty days count toward DART?
- Yes. A case where the employee stayed at work but on restricted duty or in a transferred job is recorded in column I of the OSHA 300 log, and OSHA's DART rate counts column H plus column I. Under 29 CFR 1904.7(b)(4), restricted work includes keeping the employee from performing one or more of the routine functions of their job, or from working the full workday. Those cases count toward DART even though the employee remained at work.
- What counts as hours worked?
- Hours actually worked. OSHA's Form 300A worksheet says to include hours worked by salaried, hourly, part-time and seasonal workers, and by other workers your establishment supervises day to day, such as temporary help service workers. It says not to include vacation, sick leave, holidays or any other non-work time, even if employees were paid for it. If you only keep records of hours paid, the worksheet asks you to estimate the hours employees actually worked.
- What is a good DART rate?
- The recordkeeping rule, 29 CFR Part 1904, tells you how to record cases, not what rate to aim for, so the useful comparison is the published rate for your own industry. For 2024, BLS put the DART rate at 1.4 cases per 100 full-time workers for private industry as a whole and 4.1 for warehousing and storage (NAICS 493). A warehouse below 4.1 had fewer DART cases per 100 full-time workers than its industry did that year. The table on this page lists nearby industries, and the BLS comparison tool covers every NAICS code.
Source for restricted work: 29 CFR 1904.7, general recording criteria. Read 15 September 2026.
Templates this leads into
A rate or a due date tells you where you stand. The written procedure is what closes it. These are the library entries this tool points at.
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