.ltifr-calculator-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #fff;
color: #333;
}
.calc-box {
background-color: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 25px;
margin-bottom: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.form-group {
margin-bottom: 20px;
}
.form-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #2c3e50;
}
.form-group input {
width: 100%;
padding: 12px;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box; /* Fix padding issue */
}
.form-group small {
display: block;
margin-top: 5px;
color: #6c757d;
font-size: 0.85em;
}
.calc-btn {
background-color: #0056b3;
color: white;
border: none;
padding: 14px 20px;
font-size: 16px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background-color 0.2s;
}
.calc-btn:hover {
background-color: #004494;
}
.result-box {
margin-top: 25px;
padding: 20px;
background-color: #e8f4fd;
border-left: 5px solid #0056b3;
border-radius: 4px;
display: none;
}
.result-box h3 {
margin-top: 0;
color: #0056b3;
}
.result-value {
font-size: 2.5em;
font-weight: bold;
color: #2c3e50;
margin: 10px 0;
}
.result-metric {
font-size: 1.2em;
color: #555;
}
.article-content {
line-height: 1.6;
color: #444;
}
.article-content h2 {
color: #2c3e50;
margin-top: 40px;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
}
.article-content h3 {
color: #444;
margin-top: 25px;
}
.article-content ul {
padding-left: 20px;
}
.article-content li {
margin-bottom: 10px;
}
.info-box {
background-color: #fff3cd;
border: 1px solid #ffeeba;
color: #856404;
padding: 15px;
border-radius: 4px;
margin-top: 20px;
}
function calculateLTIFR() {
// Get DOM elements
var ltiInput = document.getElementById('lti_incidents');
var hoursInput = document.getElementById('total_hours');
var factorInput = document.getElementById('normalization_factor');
var resultDiv = document.getElementById('resultDisplay');
var resultValue = document.getElementById('ltifr_result');
var resultUnit = document.getElementById('result_unit');
var explanationText = document.getElementById('result_explanation');
// Parse values
var lti = parseFloat(ltiInput.value);
var hours = parseFloat(hoursInput.value);
var factor = parseFloat(factorInput.value);
// Validation
if (isNaN(lti) || lti < 0) {
alert("Please enter a valid number for Lost Time Injuries.");
return;
}
if (isNaN(hours) || hours <= 0) {
alert("Please enter a valid number for Total Man-Hours Worked (must be greater than 0).");
return;
}
// Calculation Logic
// Formula: (Number of LTIs * Factor) / Total Hours
var ltifr = (lti * factor) / hours;
// Rounding to 2 decimal places
ltifr = Math.round(ltifr * 100) / 100;
// Formatting output based on factor selection
var factorText = (factor === 1000000) ? "1,000,000" : "200,000";
// Display results
resultDiv.style.display = "block";
resultValue.innerHTML = ltifr.toFixed(2);
resultUnit.innerHTML = "LTIs per " + factorText + " hours worked";
// Generate contextual explanation
var explanation = "This means that for every " + factorText + " hours of work performed at your site, statistics suggest there are " + ltifr.toFixed(2) + " lost time injuries.";
if (ltifr === 0) {
explanation += " An LTIFR of zero indicates a perfect safety record regarding lost time injuries for this period.";
} else if (ltifr > 0 && ltifr = 5) {
explanation += " Attention: This rate is relatively high compared to industry averages. A review of safety protocols is recommended.";
}
explanationText.innerHTML = explanation;
}
LTIFR Calculator
Total number of injuries resulting in lost time during the reporting period.
The sum of hours worked by all employees (including contractors if applicable) in the period.
1,000,000 Hours (International Standard)
200,000 Hours (OSHA / 100 Employees)
Most countries use 1,000,000. OSHA (USA) uses 200,000.
Calculation Result
0.00
LTIs per 1,000,000 hours worked
What is Lost Time Injury Frequency Rate (LTIFR)?
The Lost Time Injury Frequency Rate (LTIFR) is a key lagging safety performance indicator used by health, safety, and environment (HSE) professionals worldwide. It quantifies the frequency of lost time injuries relative to the total amount of time worked by employees.
Unlike a simple count of injuries, the LTIFR allows companies of different sizes to compare safety performance by normalizing the data against a standard number of working hours (usually 1,000,000 hours internationally or 200,000 hours in the US under OSHA guidelines).
The LTIFR Formula
The calculation relies on two main data points: the number of qualifying injuries and the total exposure hours.
LTIFR = (Number of LTIs × 1,000,000) / Total Man-Hours Worked
Definitions of Inputs
- LTI (Lost Time Injury): An injury sustained by an employee while on the job that prevents them from performing their regular duties for at least one full shift/day following the day of the injury. This includes fatalities and permanent disabilities.
- Total Man-Hours: The sum of all actual hours worked by all personnel (employees, and often subcontractors depending on reporting standards) during the reporting period. It excludes leave, holidays, and sick time.
- Normalization Factor:
- 1,000,000: Standard for Australia, Europe, and many international organizations. It represents 500 full-time employees working for a year.
- 200,000: Standard for OSHA (USA). It represents 100 full-time employees working 40 hours a week for 50 weeks.
Calculation Example
Imagine a construction company with the following data for the year:
- Incidents: 3 incidents resulting in lost time.
- Workforce: 250 employees working an average of 2,000 hours each per year.
- Total Hours: 250 employees × 2,000 hours = 500,000 hours.
Using the international standard (1,000,000 base):
LTIFR = (3 × 1,000,000) / 500,000 = 6.0
This result means the company experiences 6 lost time injuries for every million hours worked.
Why LTIFR Matters
Tracking this metric helps organizations:
- Benchmarking: Compare safety performance against industry peers.
- Trend Analysis: Identify if safety performance is improving or deteriorating over time.
- Contract Tendering: Many clients require contractors to submit their LTIFR statistics during the bidding process to ensure they hire safe operators.
While LTIFR is valuable, it is a "lagging" indicator—it measures past events. Modern safety management systems also emphasize "leading" indicators (like near-miss reporting and safety audits) to prevent incidents before they occur.