Total Injury Frequency Rate (TIFR) Calculator
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Total Recordable Injuries:
0
TIFR / TRIFR Score:
0.00
Rate per million hours:
Understanding Total Injury Frequency Rate (TIFR)
The Total Injury Frequency Rate (TIFR), often interchangeably referred to as Total Recordable Injury Frequency Rate (TRIFR), is a lagging indicator used to measure safety performance. It quantifies the number of recordable injuries relative to the total number of hours worked by employees.
How to Calculate TIFR
The standard formula for calculating TIFR depends on the region, but generally follows this structure:
TIFR = (Total Recordable Injuries × Multiplier) / Total Hours Worked
Where:
- Total Recordable Injuries: The sum of Fatalities, Lost Time Injuries (LTI), Medical Treatment Injuries (MTI), and Restricted Work Injuries (RWI). It typically excludes simple First Aid cases.
- Total Hours Worked: The sum of all actual hours worked by all employees during the specific period (e.g., month, quarter, year).
- Multiplier:
- 1,000,000: Commonly used in Australia, Europe, and many international oil & gas standards. Represents the rate per million hours worked.
- 200,000: Commonly used by OSHA in the USA. Represents the equivalent of 100 full-time employees working 40 hours a week for 50 weeks.
Definition of Input Terms
- Lost Time Injury (LTI): An injury that results in the employee being unable to work for at least one full shift.
- Medical Treatment Injury (MTI): An injury requiring treatment by a medical professional (doctor/nurse) beyond basic first aid, but not resulting in lost time.
- Restricted Work Injury (RWI): An injury where the employee can work but is restricted from performing their normal duties.
- Fatality: Death resulting from a work-related incident.
Why is TIFR Important?
Monitoring TIFR allows organizations to benchmark their safety performance against industry standards and previous years. A lower TIFR indicates a safer work environment and effective hazard management systems. However, it is a lagging indicator, meaning it measures past events. It is best used in conjunction with leading indicators (like near-miss reporting or safety audits) to create a comprehensive safety culture.
function calculateTIFR() {
// 1. Get Input Values
var hoursWorkedStr = document.getElementById('hoursWorked').value;
var ltiStr = document.getElementById('ltiCount').value;
var mtiStr = document.getElementById('mtiCount').value;
var rwiStr = document.getElementById('rwiCount').value;
var fatalitiesStr = document.getElementById('fatalitiesCount').value;
var scalingFactorStr = document.getElementById('scalingFactor').value;
// 2. Parse values and handle validation
var hoursWorked = parseFloat(hoursWorkedStr);
var lti = parseFloat(ltiStr) || 0;
var mti = parseFloat(mtiStr) || 0;
var rwi = parseFloat(rwiStr) || 0;
var fatalities = parseFloat(fatalitiesStr) || 0;
var scalingFactor = parseFloat(scalingFactorStr);
// Validation: Hours must be positive
if (!hoursWorked || hoursWorked <= 0) {
alert("Please enter a valid number for Total Hours Worked greater than 0.");
return;
}
// 3. Perform Calculations
var totalInjuries = lti + mti + rwi + fatalities;
// Formula: (Total Injuries * Multiplier) / Hours Worked
var tifr = (totalInjuries * scalingFactor) / hoursWorked;
// 4. Update UI
var resultsDiv = document.getElementById('results');
resultsDiv.style.display = 'block';
// Display Total Injuries
document.getElementById('totalInjuriesResult').innerHTML = totalInjuries;
// Display TIFR formatted to 2 decimal places
document.getElementById('tifrResult').innerHTML = tifr.toFixed(2);
// Update context label based on scaling factor
var labelElem = document.getElementById('interpretationLabel');
var valueElem = document.getElementById('interpretationValue');
if (scalingFactor === 1000000) {
labelElem.innerHTML = "Interpretation:";
valueElem.innerHTML = tifr.toFixed(2) + " injuries per 1,000,000 hours worked.";
} else {
labelElem.innerHTML = "Interpretation:";
valueElem.innerHTML = tifr.toFixed(2) + " injuries per 100 full-time employees (OSHA).";
}
}