Osha Trir Formula Total Recordable Incident Rate Calculation

OSHA TRIR Calculator

Total Recordable Incident Rate Calculation

Total number of OSHA-reportable injuries and illnesses during the period.

Actual hours worked by all employees (exclude vacations/holidays/sick leave).

Your Total Recordable Incident Rate is:

0.00

function calculateTRIR() { var incidents = document.getElementById('recordableIncidents').value; var hours = document.getElementById('totalHoursWorked').value; var resultSection = document.getElementById('trirResultSection'); var resultValue = document.getElementById('trirValue'); var interpretation = document.getElementById('trirInterpretation'); var numIncidents = parseFloat(incidents); var numHours = parseFloat(hours); if (isNaN(numIncidents) || isNaN(numHours) || numHours <= 0) { alert("Please enter valid numbers. Total hours worked must be greater than zero."); return; } // OSHA TRIR Formula: (Number of Incidents x 200,000) / Total Hours Worked var trir = (numIncidents * 200000) / numHours; var finalTrir = trir.toFixed(2); resultValue.innerText = finalTrir; resultSection.style.display = "block"; if (finalTrir < 1.0) { resultSection.style.backgroundColor = "#e7f4e4"; interpretation.style.color = "#2e7d32"; interpretation.innerText = "Excellent Safety Performance"; } else if (finalTrir < 3.0) { resultSection.style.backgroundColor = "#fff8e1"; interpretation.style.color = "#f57f17"; interpretation.innerText = "Average Safety Performance"; } else { resultSection.style.backgroundColor = "#ffebee"; interpretation.style.color = "#c62828"; interpretation.innerText = "Below Average – Action Recommended"; } }

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Understanding the OSHA TRIR Formula

The Total Recordable Incident Rate (TRIR) is a standard mathematical formula used by OSHA (Occupational Safety and Health Administration) to evaluate a company's safety performance. It provides a standardized way to compare the accident rates of different companies within the same industry, regardless of their size.

The TRIR Mathematical Formula:

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

What does "200,000" represent?

The 200,000 figure is used as a benchmark because it represents the total hours that 100 employees would work in a single year (100 employees × 40 hours per week × 50 weeks per year). This standardizes the rate per 100 full-time workers.

Example Calculation:

If a construction firm has 4 recordable incidents and their employees worked a combined total of 450,000 hours in one year, the calculation would be:

• 1. Multiply Incidents by 200,000: 4 × 200,000 = 800,000
• 2. Divide by Total Hours: 800,000 / 450,000 = 1.78
• 3. The TRIR is 1.78.

Why TRIR Matters for Your Business

• Insurance Premiums: Lower incident rates often lead to lower workers' compensation insurance costs.
• Bidding Power: Many government and private contracts require a TRIR below a certain threshold (usually 3.0 or lower) to even submit a bid.
• Internal Benchmarking: It helps safety managers identify trends and the effectiveness of new safety protocols.
• OSHA Inspections: A high TRIR compared to your industry's NAICS average can trigger a targeted OSHA inspection.

What constitutes a "Recordable Incident"?

According to OSHA, recordable incidents include work-related fatalities, injuries, or illnesses that result in loss of consciousness, days away from work, restricted work or transfer to another job, or medical treatment beyond first aid.