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OSHA 300A calculator
Enter the case totals from your OSHA 300A summary and the hours worked. You get the TRIR and DART rates that prequalification forms ask for.
Enter hours worked or the number of employees.
TRIR = recordable cases × 200,000 ÷ hours worked
Where the numbers come from
Columns G to J of the 300A count cases by their most serious outcome: deaths, days away, job transfer or restriction, and other recordable cases. Together they are your recordable cases. H plus I are your DART cases. The summary must be posted from February 1 to April 30 of the following year.
Questions
- Do I have to fill out a 300A if there were no injuries?
- Yes. Employers who must keep OSHA records post the 300A every year, even with zeros (29 CFR 1904.32).
- Who signs the 300A?
- A company executive: an owner, officer, the highest-ranking official at the establishment, or that person's supervisor.
- Do I have to submit it online?
- Establishments in construction with 20 to 249 employees, and any establishment with 250 or more, submit the 300A to OSHA's Injury Tracking Application by March 2 (29 CFR 1904.41).
Definitions from OSHA's recordkeeping rule, 29 CFR Part 1904. Results are for information; check them against your own 300 Log.
Keep the log that feeds these numbers
HardHat Binder keeps your OSHA 300, 300A and 301 forms and calculates TRIR and DART from them automatically.