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TRIR and DART rate calculator
Type the case totals from Form 300A and the total hours worked. Both rates use the formula printed in OSHA's recordkeeping forms package.
Rates from your 300A totals
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The two formulas
| Rate | Formula | From Form 300A |
|---|---|---|
| Total recordable case rate (TRIR) | Total number of injuries and illnesses x 200,000 / hours worked by all employees | Every case on the log. Each is counted once in G, H, I or J. |
| DART rate | (entries in column H + entries in column I) x 200,000 / hours worked by all employees | Cases with days away (H) and cases with job transfer or restriction (I). |
Worked example
An establishment had 5 recordable cases: 2 with days away (H), 1 with job transfer or restriction (I), 2 other recordable (J). Its employees worked 152,000 hours.
Total recordable case rate: 5 x 200,000 / 152,000 = 6.58. DART rate: (2 + 1) x 200,000 / 152,000 = 3.95.
Where 200,000 comes from
The forms package explains it as the hours 100 employees would work at 40 hours a week for 50 weeks. It is the standard base, so a rate reads as cases per 100 full-time workers per year.
Other rates, same formula
The package says the same formula works for any other total from Form 300A, such as restricted-work cases (column I) or skin disorders (column M2): put that total in place of the case count.
Getting the hours right
The hours are those actually worked. The Form 300A worksheet calculator covers what to include and how to estimate them.
Need the same totals as an ITA file? Drop the Form 300 log and get the 300A CSV with G to M counted from your cases.
Open the converterShort answers
What is the formula for TRIR?
The total number of recordable injuries and illnesses, times 200,000, divided by the number of hours worked by all employees. OSHA's forms package calls the result the total recordable case rate.
What is the DART rate formula?
The number of entries in Form 300A column H plus the number in column I, times 200,000, divided by the number of hours worked by all employees.
Why does the formula use 200,000?
OSHA's forms package says 200,000 is the number of hours 100 employees working 40 hours a week for 50 weeks would work. It is the standard base for incidence rates.
Related
Sources
Read on 2026-11-10. OSHA can change these documents; the link is the authority. Logmend is an independent information tool. It is not affiliated with or endorsed by OSHA or the U.S. Department of Labor, and it is not tax, legal or professional advice.