TRIR Calculator
Calculate Total Recordable Incident Rate (TRIR) and DART rate to measure and track workplace safety performance.
What is the Total Recordable Incident Rate (TRIR)?
The Total Recordable Incident Rate (TRIR), sometimes referred to as the Total Recordable Injury Frequency (TRIF), is a standardized safety metric established by the Occupational Safety and Health Administration (OSHA). It is used to measure and evaluate a company's safety performance over a specific period, typically one year.
TRIR represents the number of work-related injuries and illnesses per 100 full-time employees. By normalizing safety data against a constant number of hours worked, businesses of different sizes can easily compare their safety records against industry benchmarks.
How to Calculate TRIR
The OSHA formula for calculating TRIR is:
$$\text{TRIR} = \frac{\text{Recordable Incidents} \times 200,000}{\text{Total Hours Worked}}$$Where:
- Recordable Incidents: The total number of work-related injuries, illnesses, or deaths that require medical treatment beyond first aid.
- 200,000: The standard base representing the annual hours worked by 100 full-time employees (assuming 40 hours per week for 50 weeks).
- Total Hours Worked: The actual total number of hours worked by all employees (including overtime) during the period, excluding paid time off like vacations, sick leave, or holidays.
What is the DART Rate?
The DART Rate stands for Days Away, Restricted, or Transferred. It is a subset of the TRIR that measures more severe workplace injuries and illnesses—specifically those that result in an employee missing work, working with restrictions, or being transferred to a different job duty.
$$\text{DART Rate} = \frac{\text{DART Cases} \times 200,000}{\text{Total Hours Worked}}$$A high DART rate indicates that injuries occurring at the workplace are relatively severe, requiring significant recovery time or job modifications.
Why Are TRIR and DART Rates Important?
Workplace safety metrics are critical for several reasons:
- OSHA Inspections: Companies with high TRIR and DART rates compared to their industry average are more likely to be targeted for OSHA audits and inspections.
- Insurance Premiums: Safety rates influence worker's compensation insurance premiums. Lower incident rates often translate to lower insurance costs.
- Business Bidding: Many clients, prime contractors, and government agencies require subcontractors to submit their safety rates during the bidding process. High rates can disqualify companies from winning contracts.
Frequently Asked Questions
What qualifies as an OSHA-recordable incident?
An injury or illness is recordable if it is work-related and results in death, loss of consciousness, days away from work, restricted work or job transfer, or medical treatment beyond first aid. Minor cuts or scrapes treated with first aid are not recordable.
What is a good TRIR score?
A "good" TRIR depends on the industry, as hazard levels vary. Generally, a TRIR below 3.0 is considered good across most industries, but high-risk sectors (like construction or manufacturing) may have higher industry averages, while low-risk sectors (like tech or finance) often have averages close to zero.
Are temporary employees and contractors included in TRIR?
Yes. If you supervise their day-to-day work, their injuries and hours worked must be included in your company's OSHA logs and TRIR calculations.
How can a company improve its TRIR and DART rates?
Companies can improve their safety rates by conducting regular safety training, performing job hazard analyses, encouraging near-miss reporting, implementing ergonomics programs, and maintaining a proactive safety culture.
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