Trir Calculation Formula

TRIR Formula:

\[ TRIR = \frac{Number\ of\ Recordable\ Incidents \times 200,000}{Total\ Hours\ Worked} \]

Total Recordable Incident Rate (TRIR):

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1. What is the TRIR Formula?

The Total Recordable Incident Rate (TRIR) is a standard safety metric used to compare injury and illness incidence rates across organizations and industries. It represents the number of recordable incidents per 100 full-time workers during a one-year period.

2. How Does the Calculator Work?

The calculator uses the TRIR formula:

\[ TRIR = \frac{Number\ of\ Recordable\ Incidents \times 200,000}{Total\ Hours\ Worked} \]

Where:

Number of Recordable Incidents — OSHA-recordable injuries and illnesses
200,000 — Base for 100 full-time workers (100 workers × 2000 hours/year)
Total Hours Worked — Sum of all employee hours during the period

Explanation: The formula standardizes incident rates across organizations of different sizes by using the 200,000 hour benchmark.

3. Importance of TRIR Calculation

Details: TRIR is a key performance indicator for workplace safety programs, allowing comparison across companies and industries, and helping identify safety improvement opportunities.

4. Using the Calculator

Tips: Enter the total number of OSHA-recordable incidents and total hours worked by all employees during the measurement period.

5. Frequently Asked Questions (FAQ)

Q1: What counts as a recordable incident?
A: OSHA recordable incidents include work-related injuries and illnesses that result in death, days away from work, restricted work, medical treatment beyond first aid, or loss of consciousness.

Q2: What is a good TRIR score?
A: The average TRIR varies by industry. Generally, lower is better, with rates below 3.0 considered good and below 1.0 considered excellent for most industries.

Q3: Why use 200,000 hours?
A: This represents 100 employees working 40-hour weeks for 50 weeks per year (100 × 40 × 50 = 200,000), providing a standard baseline for comparison.

Q4: What time period should be used?
A: Typically calculated annually, but can be used for any period if you adjust the hours worked accordingly.

Q5: How does TRIR differ from DART rate?
A: DART (Days Away, Restricted or Transferred) rate only includes incidents resulting in days away from work or restricted/transferred duty, while TRIR includes all recordable incidents.