Osha Frequency Rate Calculation

OSHA Frequency Rate (TRIR) Calculator

Enter the total number of work-related injuries or illnesses that occurred during the period.

Enter the actual hours worked by all employees (excluding leave, holidays, and vacations).

Calculation Results

function calculateOSHAFrequency() { var injuries = parseFloat(document.getElementById('recordableInjuries').value); var hours = parseFloat(document.getElementById('totalHoursWorked').value); var resultDiv = document.getElementById('oshaResult'); var rateValue = document.getElementById('rateValue'); var rateDescription = document.getElementById('rateDescription'); if (isNaN(injuries) || isNaN(hours) || hours <= 0) { alert("Please enter valid numbers. Total hours must be greater than zero."); return; } // OSHA TRIR Formula: (Injuries * 200,000) / Total Hours // 200,000 is the base for 100 full-time workers (40 hours/week * 50 weeks/year) var trir = (injuries * 200000) / hours; var roundedTrir = trir.toFixed(2); resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#fff"; resultDiv.style.border = "2px solid #004a99"; rateValue.innerHTML = roundedTrir; rateDescription.innerHTML = "Your Total Recordable Incident Rate (TRIR) is " + roundedTrir + ". This means for every 100 full-time equivalent employees, " + roundedTrir + " recordable incidents occurred during this period."; }

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Understanding OSHA Frequency Rate (TRIR)

The OSHA Frequency Rate, commonly referred to as the Total Recordable Incident Rate (TRIR), is a standard mathematical formula used by the Occupational Safety and Health Administration (OSHA) to measure a company's safety performance. It allows companies of different sizes to compare their safety records against one another and against industry averages.

The OSHA Frequency Rate Formula

To calculate your incident rate, you use the following standard formula:

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

The number 200,000 represents the number of hours 100 employees would work in a full year (100 employees x 40 hours per week x 50 weeks per year). This standardizes the result so that a company with 10 employees can be compared fairly to a company with 10,000 employees.

What Counts as a Recordable Incident?

Under OSHA requirements, an incident is recordable if it results in any of the following:

• Death
• Days away from work
• Restricted work or transfer to another job
• Medical treatment beyond first aid
• Loss of consciousness
• A significant injury or illness diagnosed by a physician or other licensed health care professional

Calculation Example

Let's look at a realistic scenario for a mid-sized manufacturing plant:

• Total Injuries in 2023: 4
• Total Employee Hours Worked: 180,000

Step 1: Multiply the number of injuries by 200,000.
4 x 200,000 = 800,000

Step 2: Divide that total by the hours worked.
800,000 / 180,000 = 4.44

In this example, the TRIR is 4.44. This tells the safety manager that for every 100 workers, approximately 4.44 injuries occurred during the year.

Why is TRIR Important?

Your OSHA Frequency Rate is more than just a number on a spreadsheet. It impacts your business in several ways:

1. Benchmarking: You can compare your safety performance against the Bureau of Labor Statistics (BLS) industry averages.
2. Insurance Premiums: High incident rates often lead to higher Workers' Compensation insurance premiums.
3. Bidding on Contracts: Many government agencies and large corporations require your TRIR to be below a certain threshold before you can bid on a project.
4. Safety Culture: A rising TRIR is an early warning sign that your safety protocols may need to be audited or improved.

Tips for Maintaining Accurate Records

To ensure your calculation is correct, always use actual hours worked. Do not include vacation time, sick leave, or holidays, as these hours do not involve exposure to workplace hazards. Keeping a diligent OSHA 300 log throughout the year makes this calculation simple and accurate at year-end.