LTI Frequency Rate Calculator
.ltifr-calculator-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
}
.ltifr-header {
text-align: center;
margin-bottom: 30px;
}
.ltifr-header h2 {
color: #2c3e50;
margin-bottom: 10px;
}
.ltifr-inputs {
display: flex;
flex-wrap: wrap;
gap: 20px;
margin-bottom: 25px;
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.ltifr-input-group {
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flex-direction: column;
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.ltifr-input-group label {
font-weight: 600;
margin-bottom: 8px;
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.ltifr-input-group input, .ltifr-input-group select {
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font-size: 16px;
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.ltifr-input-group input:focus {
border-color: #0066cc;
outline: none;
}
.ltifr-btn {
width: 100%;
padding: 15px;
background-color: #0066cc;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
}
.ltifr-btn:hover {
background-color: #0052a3;
}
.ltifr-result-box {
margin-top: 25px;
padding: 20px;
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.ltifr-result-value {
font-size: 32px;
font-weight: 700;
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}
.ltifr-explanation {
margin-top: 10px;
font-size: 14px;
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line-height: 1.5;
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.ltifr-content {
margin-top: 50px;
line-height: 1.6;
color: #333;
}
.ltifr-content h3 {
color: #2c3e50;
margin-top: 30px;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
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.ltifr-content p {
margin-bottom: 15px;
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margin-bottom: 15px;
padding-left: 20px;
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margin-bottom: 8px;
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.formula-box {
background: #eef6fc;
padding: 15px;
border-radius: 4px;
font-family: monospace;
font-size: 16px;
margin: 20px 0;
text-align: center;
border: 1px solid #cde0f0;
}
How to Calculate LTI Frequency Rate (LTIFR)
The Lost Time Injury Frequency Rate (LTIFR) is a key safety performance indicator used by environmental, health, and safety (EHS) professionals worldwide. It quantifies the number of lost time injuries that occur in a workplace relative to the number of hours worked.
Unlike a simple count of injuries, the LTIFR normalizes the data, allowing companies to compare safety performance across different projects, time periods, or with industry benchmarks, regardless of the workforce size.
The LTIFR Formula
The calculation relies on three components: the count of specific incidents, the total exposure hours, and a standard multiplication factor.
LTIFR = (Number of LTIs × 1,000,000) / Total Man-Hours Worked
Variables Explained:
- Number of LTIs: The total number of incidents resulting in a "Lost Time Injury" during the reporting period. A Lost Time Injury occurs when an employee cannot return to work on their next scheduled shift due to the injury.
- Total Man-Hours: The sum of all actual hours worked by all employees during the specific period. This should include overtime but exclude vacation, sick leave, or public holidays.
- Multiplier (1,000,000): This is the standard scaling factor used in many regions (like Australia and the UK) to represent the number of injuries per 1,000,000 hours worked. Note that some standards (like OSHA in the US) may use 200,000 as the base (representing 100 employees working 40 hours a week for 50 weeks).
Calculation Example
Consider a manufacturing plant that wants to calculate its LTIFR for the previous year:
- Injuries: There were 3 incidents where workers took time off to recover.
- Workforce: The plant has 250 employees.
- Hours: Collectively, they worked 500,000 hours in the year.
Using the standard formula:
LTIFR = (3 × 1,000,000) / 500,000 = 6.0
This result means that for every million hours worked at this site, statistics suggest there are 6 lost time injuries.
Why is LTIFR Important?
Tracking this metric allows organizations to:
- Benchmark Performance: Compare current safety records against previous years.
- Identify Trends: A rising LTIFR indicates that existing safety controls may be failing.
- Contract Requirements: Many clients require contractors to submit their LTIFR before bidding on projects.
function calculateLTIFR() {
// Get input values
var injuriesInput = document.getElementById('numInjuries');
var hoursInput = document.getElementById('totalHours');
var factorInput = document.getElementById('scalingFactor');
var resultBox = document.getElementById('resultBox');
var resultDisplay = document.getElementById('ltifrResult');
var textDisplay = document.getElementById('ltifrText');
// Parse values
var injuries = parseFloat(injuriesInput.value);
var hours = parseFloat(hoursInput.value);
var factor = parseFloat(factorInput.value);
// Validation
if (isNaN(injuries) || injuries < 0) {
alert("Please enter a valid number of injuries.");
return;
}
if (isNaN(hours) || hours <= 0) {
alert("Please enter a valid amount of total hours worked (must be greater than 0).");
return;
}
// Calculation Logic
var ltifr = (injuries * factor) / hours;
// Rounding to 2 decimal places
var finalRate = ltifr.toFixed(2);
// Display Logic
resultBox.style.display = 'block';
resultDisplay.innerHTML = finalRate;
// Contextual Text
var factorText = (factor === 1000000) ? "1,000,000" : "200,000";
textDisplay.innerHTML = "This means there were
" + finalRate + " lost time injuries per " + factorText + " hours worked.";
}