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TRIR Calculator

TRIR Formula

incidents
hours
incidents per 200,000 hours

1. What is the TRIR Calculator?

Definition: The TRIR Calculator computes the OSHA Total Recordable Incident Rate, which measures workplace safety by calculating the number of recordable injuries per 200,000 hours worked.

Purpose: Helps employers and safety professionals assess workplace safety, comply with OSHA regulations, and identify areas for improvement.

2. How Does the Calculator Work?

The calculator computes the TRIR using the following formula:

Formula:

\( R_t = \frac{N_i \times 200,000}{H_w} \)
Where:
  • \( R_t \): TRIR (incidents per 200,000 hours)
  • \( N_i \): Number of recordable injuries (incidents)
  • \( H_w \): Total hours worked by all employees (hours)

Steps:

  • Step 1: Input Number of Recordable Injuries. Enter the total number of OSHA-recordable injuries (e.g., 2).
  • Step 2: Input Total Hours Worked. Enter the total hours worked by all employees (e.g., 2,000,000).
  • Step 3: Calculate TRIR. Multiply the number of injuries by 200,000 and divide by total hours worked.

3. Importance of TRIR Calculation

Calculating the TRIR is crucial for:

  • Safety Compliance: Ensures adherence to OSHA reporting standards.
  • Workplace Safety: Identifies high-risk areas by tracking recordable incidents.
  • Benchmarking: Allows comparison of safety performance across industries or organizations.

4. Using the Calculator

Example: Number of recordable injuries = 2, Total hours worked = 2,000,000:

  • Step 1: \( N_i \) = 2 incidents.
  • Step 2: \( H_w \) = 2,000,000 hours.
  • Step 3: \( R_t = \frac{2 \times 200,000}{2,000,000} = 0.2 \).
  • Result: TRIR = 0.20 incidents per 200,000 hours (Low, indicating a safe workplace).

This shows the workplace safety level.

5. Frequently Asked Questions (FAQ)

Q: What is a recordable injury?
A: A recordable injury is a work-related injury or illness that requires medical treatment beyond first aid, results in lost workdays, restricted duties, or other OSHA-defined criteria.

Q: Why use 200,000 in the formula?
A: The 200,000 constant represents 100 employees working 40 hours per week for 50 weeks, standardizing the rate for comparison.

Q: What is a good TRIR rate?
A: A TRIR below 1.0 is considered low (safe), 1.0–3.0 is moderate, and above 3.0 is high, indicating a need for safety improvements.

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