What is our TRIR incident rate?
Type the recordable injuries and illnesses from your OSHA 300 log and the hours your employees worked in the year. The calculator gives the total recordable incident rate (TRIR), and the DART rate when you add the cases with days away, restricted work or a job transfer.
- TRIR
- 4
3 recordable cases in 150,000 hours worked is a TRIR of 4.
- Hours worked
- 150,000
- In words
- About 4 recordable cases for every 100 full-time workers in a year
TRIR: 4. 3 recordable cases in 150,000 hours worked is a TRIR of 4.
How to calculate
Works out OSHA’s total recordable incident rate (TRIR) and the DART rate per 100 full-time workers from the recordable cases and the hours worked in a year.
Example with the default inputs (Recordable cases 3, I know Hours worked, Hours worked 150,000): 3 recordable cases in 150,000 hours worked is a TRIR of 4.
Method: TRIR = recordable cases × 200,000 ÷ hours worked; DART rate = DART cases × 200,000 ÷ hours worked.
- 200,000 hours is 100 full-time employees working 40 hours a week for 50 weeks.
- With a head count, each full-time employee counts as 2,000 hours a year; payroll hours are more accurate.
- Cases are those recorded on OSHA Form 300 under 29 CFR 1904.
Worked examples
Each example is checked against the calculator on every build.
- Recordable cases 3, I know Hours worked, Hours worked 150,000 gives TRIR 4, Hours worked 150,000.Source: OSHA, Clarification on how the formula is used by OSHA to calculate incident rates (2016-08-23): (injuries and illnesses × 200,000) ÷ employee hours worked; 200,000 is 100 employees working 40 hours a week, 50 weeks a year, https://www.osha.gov/laws-regs/standardinterpretations/2016-08-23 (retrieved 2026-10-03)
- Recordable cases 5, DART cases 2, I know Employees, Full-time employees 50 gives Hours worked 100,000, TRIR 10, DART rate 4.Source: OSHA, Clarification on how the formula is used by OSHA to calculate incident rates (2016-08-23): (injuries and illnesses × 200,000) ÷ employee hours worked; 200,000 is 100 employees working 40 hours a week, 50 weeks a year, https://www.osha.gov/laws-regs/standardinterpretations/2016-08-23 (retrieved 2026-10-03)
- Recordable cases 7, DART cases 3, I know Hours worked, Hours worked 412,345 gives TRIR 3.395215, DART rate 1.455092.Source: OSHA, Clarification on how the formula is used by OSHA to calculate incident rates (2016-08-23): (injuries and illnesses × 200,000) ÷ employee hours worked; 200,000 is 100 employees working 40 hours a week, 50 weeks a year, https://www.osha.gov/laws-regs/standardinterpretations/2016-08-23 (retrieved 2026-10-03)
How it works
- TRIR = recordable cases × 200,000 ÷ hours worked.
- DART rate = DART cases × 200,000 ÷ hours worked, when DART cases are typed.
- Hours worked are typed, or worked out as full-time employees × 2,000.
200,000 hours = 100 employees × 40 hours a week × 50 weeks, so each rate is the number of cases for every 100 full-time workers in a year. The rates show with up to 2 decimals, rounded half up from the exact value.
Rules
- Cases are whole numbers from 0 to 10⁹; hours 1 to 10¹²; employees 0.01 to 10⁸.
- DART cases are part of the recordable cases: more DART cases than recordable cases gives no answer.
- Counts are used as the exact decimals typed.
Worked examples by hand
3 cases, 150,000 hours. 3 × 200,000 ÷ 150,000 = 4.00.
50 employees, 5 cases, 2 DART. Hours 50 × 2,000 = 100,000. TRIR 5 × 200,000 ÷ 100,000 = 10.00; DART 2 × 200,000 ÷ 100,000 = 4.00.
7 cases, 3 DART, 412,345 hours. TRIR 1,400,000 ÷ 412,345 = 3.40; DART 600,000 ÷ 412,345 = 1.46.
Other questions people ask
How do I calculate TRIR?
Multiply the number of recordable cases by 200,000 and divide by the total hours all employees worked. 3 cases in 150,000 hours is 3 × 200,000 ÷ 150,000 = 4.0.
Why 200,000?
It is the hours 100 employees work in a year at 40 hours a week for 50 weeks. Scaling to 200,000 hours makes the rate a number of cases per 100 full-time workers, so firms of any size compare.
What is a good TRIR?
Lower is better, and it depends on the industry. Compare your rate with the average for your industry in the Bureau of Labor Statistics injury and illness survey for the same year.
What is the DART rate?
Days Away, Restricted or Transferred: the same formula, counting only the recordable cases that kept a worker away from work, limited their duties, or moved them to another job. It is never above the TRIR.
What if I do not know the hours worked?
Use the number of full-time employees; each counts as 2,000 hours a year. Payroll hours are better, because they leave out vacation, sick leave and holidays, and count overtime and part-time work.
What counts as a recordable case?
A work-related injury or illness that needs more than first aid, or causes days away, restricted work, a transfer, loss of consciousness, or a significant diagnosis, as set out in OSHA’s recordkeeping rule, 29 CFR 1904.