Calculate Injury Rate

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OSHA Incident Rate Calculator (TRIR)

Calculate your Total Recordable Incident Rate based on OSHA standards.

Enter the total number of OSHA-recordable injuries and illnesses.
Total hours worked by all employees during the period (usually one year).
Your TRIR Score
0.00

How to Calculate Injury Rate (TRIR)

The Total Recordable Incident Rate (TRIR) is the standard calculation used by the Occupational Safety and Health Administration (OSHA) to quantify a company's safety performance. This metric allows companies of different sizes to be compared on equal footing by standardizing injury statistics per 100 full-time employees.

The OSHA Formula

To calculate your injury rate, use the following standard formula:

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

Understanding the Variables

  • Number of Incidents: This is the count of work-related injuries and illnesses that occurred during the specific period (usually a calendar year) that required medical treatment beyond first aid.
  • 200,000: This constant represents the equivalent of 100 full-time employees working 40 hours per week for 50 weeks per year (100 employees × 40 hours × 50 weeks = 200,000 hours). This standardizes the rate.
  • Total Hours Worked: The sum of all actual hours worked by all employees (including overtime) during the period. Do not include vacation, sick leave, or holidays.

Example Calculation

Let's assume a manufacturing company has 125 employees.

  • Incidents: They had 5 recordable injuries in the past year.
  • Hours Worked: The employees worked a combined total of 250,000 hours.

The calculation would be:

(5 × 200,000) ÷ 250,000 = 1,000,000 ÷ 250,000 = 4.0

This means for every 100 full-time employees, 4 people suffered a recordable injury that year.

What is a Good TRIR Score?

A "good" score varies heavily by industry. High-risk industries like construction or heavy manufacturing will naturally have higher averages than office-based sectors like finance. However, a lower score is always better. Generally:

  • TRIR of 0: Perfect safety record.
  • TRIR < 3.0: Often considered average for general industry.
  • TRIR > 5.0: May trigger increased insurance premiums or OSHA scrutiny.

It is crucial to benchmark your score against the specific NAICS code for your industry to understand your true safety performance.

function calculateInjuryRate() { // 1. Get input values using var var incidentCount = document.getElementById('incidentsInput').value; var totalHours = document.getElementById('hoursInput').value; var resultContainer = document.getElementById('result-container'); var resultElement = document.getElementById('trirResult'); var analysisElement = document.getElementById('analysisText'); // 2. Validate inputs // Check if empty if (incidentCount === "" || totalHours === "") { alert("Please enter both the number of incidents and total hours worked."); return; } // Convert to float numbers var incidents = parseFloat(incidentCount); var hours = parseFloat(totalHours); // Check for negative numbers or zero hours (divide by zero protection) if (incidents < 0 || hours <= 0) { alert("Please enter valid positive numbers. Total hours must be greater than zero."); return; } // 3. Perform the Calculation: (Incidents * 200,000) / Hours var constant = 200000; var trir = (incidents * constant) / hours; // 4. Round to 2 decimal places var finalRate = trir.toFixed(2); // 5. Display the result resultElement.innerHTML = finalRate; resultContainer.style.display = "block"; // 6. Generate dynamic feedback text var feedback = ""; if (finalRate == 0) { feedback = "Excellent! You have a perfect recordable incident rate of zero."; resultElement.style.color = "#27ae60"; // Green } else if (finalRate < 3.0) { feedback = "This is generally considered a good safety rating for most industries."; resultElement.style.color = "#27ae60"; // Green } else if (finalRate < 6.0) { feedback = "This rating indicates room for improvement in your safety protocols."; resultElement.style.color = "#f39c12"; // Orange } else { feedback = "This rate is high. Review your safety measures and incident reporting immediately."; resultElement.style.color = "#c0392b"; // Red } analysisElement.innerHTML = feedback + " This means there were " + finalRate + " injuries per 100 full-time employees."; }

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