Skip to content
Finance Calc Kit
Business

TRIR Calculator

Calculate Total Recordable Incident Rate (TRIR) and DART rate to measure workplace safety performance.

Workplace safety inputs

Enter OSHA recordable incidents, DART cases, and total hours worked to compute standardized incident rates.

TRIR (Total Recordable Incident Rate)

2.00

2 recordable incident(s) per 200,000 hours

DART rate

1.00

Hours worked

200,000

How TRIR and DART are calculated

OSHA incident rates normalized per 200,000 hours worked.

  1. Calculate Total Recordable Incident Rate (TRIR)

    TRIR=Incidents×200,000Hours=2×200,000200,000=2.00\text{TRIR} = \frac{\text{Incidents} \times 200{,}000}{\text{Hours}} = \frac{2 \times 200{,}000}{200,000} = 2.00

    Multiply 2 recordable incident(s) by 200,000, then divide by 200,000 hours worked.

  2. Calculate DART rate

    DART=DART Cases×200,000Hours=1×200,000200,000=1.00\text{DART} = \frac{\text{DART Cases} \times 200{,}000}{\text{Hours}} = \frac{1 \times 200{,}000}{200,000} = 1.00

    Multiply 1 DART case(s) by 200,000, then divide by 200,000 hours worked.

Report tool

What is TRIR?

TRIR stands for Total Recordable Incident Rate. OSHA and safety professionals use it to compare workplace injury frequency across companies and industries. The rate normalizes recordable incidents to a standard of 200,000 hours worked, roughly 100 full-time employees for one year.

TRIR and DART formulas

TRIR=Recordable Incidents×200,000Total Hours Worked,DART=DART Cases×200,000Total Hours Worked\text{TRIR} = \frac{\text{Recordable Incidents} \times 200{,}000}{\text{Total Hours Worked}}, \quad \text{DART} = \frac{\text{DART Cases} \times 200{,}000}{\text{Total Hours Worked}}

TRIR counts all OSHA recordable injuries and illnesses. DART (Days Away, Restricted, or Transferred) counts only cases involving days away from work, job restriction, or job transfer. Both rates use the same 200,000-hour multiplier so results are comparable across employers of different sizes.

Worked example

A company reports 2 recordable incidents, 1 DART case, and 200,000 hours worked in a year. TRIR equals (2 times 200,000) divided by 200,000, which is 2.0. DART equals (1 times 200,000) divided by 200,000, which is 1.0.

How OSHA uses incident rates

  • Employers must record work-related injuries and illnesses that meet OSHA criteria on OSHA 300 logs.
  • TRIR helps benchmark safety performance against industry averages published by the Bureau of Labor Statistics.
  • A lower TRIR or DART rate generally indicates fewer serious incidents relative to hours worked.
  • Rates above industry medians may trigger additional OSHA scrutiny or targeted inspections.

Frequently asked questions

What counts as a recordable incident?
OSHA recordable cases include work-related deaths, days away from work, restricted work, medical treatment beyond first aid, and certain diagnosed illnesses. Consult OSHA 29 CFR 1904 for full criteria.
Why multiply by 200,000?
200,000 hours represents 100 employees working 40 hours per week for 50 weeks. The multiplier standardizes rates so small and large employers can be compared fairly.
What is the difference between TRIR and DART?
TRIR includes all recordable cases. DART is a subset that only counts cases with days away, restricted duty, or job transfer.
Can TRIR be zero?
Yes. A TRIR of zero means no OSHA recordable incidents occurred during the reporting period.
Are results stored on your servers?
No. All math runs in your browser. Nothing is sent to the server.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.