Total Recordable Injury Rate Calculator

TRIR Calculator

Calculate your OSHA Total Recordable Injury Rate

Total number of OSHA-recordable injuries and illnesses.

Total hours worked by all employees in the reporting period.

What is Total Recordable Injury Rate (TRIR)?

The Total Recordable Injury Rate (TRIR) is a standardized safety metric used by the Occupational Safety and Health Administration (OSHA) to quantify safety performance. It calculates the number of recordable incidents per 100 full-time workers during a one-year period.

TRIR is one of the most widely used lagging indicators in Environmental, Health, and Safety (EHS) management. It allows companies to compare their safety performance against other companies within the same industry, regardless of company size.

The TRIR Formula

The calculation relies on a standard mathematical formula established by OSHA:

TRIR = (Number of Incidents × 200,000) / Total Hours Worked

Here is a breakdown of the variables:

• Number of Incidents: The total count of work-related injuries and illnesses that resulted in death, days away from work, restricted work, transfer to another job, medical treatment beyond first aid, or loss of consciousness.
• Total Hours Worked: The sum of all hours worked by all employees (including full-time, part-time, seasonal, and temporary workers) during the calendar year.
• 200,000: This constant represents the equivalent of 100 employees working 40 hours per week for 50 weeks (100 × 40 × 50 = 200,000). This standardizes the rate so companies of different sizes can be compared fairly.

Example Calculation

Let's look at a realistic example for a mid-sized construction company.

Suppose a company has experienced 3 recordable injuries over the past year. During that same period, their workforce logged a combined total of 450,000 hours.

Using the formula:

• (3 × 200,000) = 600,000
• 600,000 / 450,000 = 1.33

The company's TRIR is 1.33. This means that for every 100 full-time equivalent employees, approximately 1.33 injuries occurred.

What is a Good TRIR Score?

A "good" TRIR score depends heavily on your specific industry code (NAICS). High-risk industries like construction or manufacturing naturally have higher average rates than low-risk industries like finance or technology. However, the general rule is:

• Lower is Better: A score of 0.0 is the ultimate goal (zero incidents).
• Industry Average: Staying below your industry's average TRIR indicates your safety program is performing better than your peers.
• Trending Down: More important than a single year's score is the trend. A declining TRIR over several years indicates an improving safety culture.

Many organizations aim for a TRIR of 1.0 or lower as a sign of world-class safety performance, though this benchmark varies by sector.

Why TRIR Matters

Tracking your injury rate is crucial for several reasons:

1. Compliance: OSHA requires many employers to maintain records of injuries and illnesses (Form 300, 300A, and 301).
2. Insurance Costs: High injury rates often lead to higher workers' compensation premiums.
3. Contract Bidding: Many clients vet potential contractors based on their safety history. A high TRIR can disqualify your company from bidding on lucrative projects.
4. Employee Morale: A low injury rate reflects a workplace that values employee well-being, leading to better retention and productivity.

Limitations of TRIR

While TRIR is the standard, it is a lagging indicator. It measures past failures rather than predicting future risks. Safety professionals recommend pairing TRIR with leading indicators—such as near-miss reporting, safety audits, and training hours—to get a complete picture of workplace safety.