.ifr-calculator-container {
font-family: sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.ifr-calc-box {
background-color: #f5f7f9;
border: 1px solid #e1e4e8;
border-radius: 8px;
padding: 25px;
margin-bottom: 30px;
}
.ifr-calc-box h3 {
margin-top: 0;
color: #2c3e50;
text-align: center;
}
.ifr-form-group {
margin-bottom: 15px;
}
.ifr-form-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #333;
}
.ifr-form-group input, .ifr-form-group select {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box; /* Ensures padding doesn't affect width */
}
.ifr-btn {
width: 100%;
padding: 12px;
background-color: #0056b3;
color: white;
border: none;
border-radius: 4px;
font-size: 16px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
}
.ifr-btn:hover {
background-color: #004494;
}
#ifrResult {
margin-top: 20px;
padding: 15px;
background-color: #e8f4fd;
border: 1px solid #b8daff;
border-radius: 4px;
text-align: center;
font-size: 18px;
font-weight: bold;
color: #004085;
display: none; /* Hidden by default */
}
.ifr-article h2 {
color: #2c3e50;
margin-top: 25px;
}
.ifr-article p {
line-height: 1.6;
color: #444;
}
.ifr-article ul {
line-height: 1.6;
color: #444;
padding-left: 20px;
}
function calculateIFR() {
// Get input values
var incidentsStr = document.getElementById('numIncidents').value;
var hoursStr = document.getElementById('totalHours').value;
var factorStr = document.getElementById('standardFactor').value;
var resultDiv = document.getElementById('ifrResult');
// Convert to numbers
var incidents = parseFloat(incidentsStr);
var hours = parseFloat(hoursStr);
var factor = parseFloat(factorStr);
// Validate inputs
if (isNaN(incidents) || incidents < 0) {
resultDiv.innerHTML = "Please enter a valid number of incidents (0 or more).";
resultDiv.style.display = "block";
resultDiv.style.color = "#721c24";
resultDiv.style.backgroundColor = "#f8d7da";
resultDiv.style.borderColor = "#f5c6cb";
return;
}
if (isNaN(hours) || hours <= 0) {
resultDiv.innerHTML = "Please enter valid total hours worked (must be greater than 0).";
resultDiv.style.display = "block";
resultDiv.style.color = "#721c24";
resultDiv.style.backgroundColor = "#f8d7da";
resultDiv.style.borderColor = "#f5c6cb";
return;
}
// Calculate IFR: (Incidents * Factor) / Total Hours
var ifr = (incidents * factor) / hours;
// Format result (2 decimal places) and display
resultDiv.innerHTML = "Incident Frequency Rate (IFR): " + ifr.toFixed(2);
// Reset styles for success state
resultDiv.style.display = "block";
resultDiv.style.color = "#004085";
resultDiv.style.backgroundColor = "#e8f4fd";
resultDiv.style.borderColor = "#b8daff";
}
Incident Frequency Rate Calculator
1,000,000 Hours (International Standard)
200,000 Hours (OSHA/North America Standard)
Understanding Incident Frequency Rate (IFR)
The Incident Frequency Rate (IFR) is a crucial lagging indicator used in occupational health and safety to quantify the number of recordable injuries and illnesses occurring within a workplace over a specific period, normalized against the total hours worked.
It allows organizations to benchmark their safety performance against industry standards or their own past performance, regardless of changes in the workforce size or hours worked.
The IFR Formula Explained
The calculation standardizes injury data to make comparisons fair. The formula used by this calculator is:
IFR = (Number of Recordable Incidents × Standardization Factor) / Total Hours Worked
- Number of Recordable Incidents: The total count of injuries or illnesses categorized as "recordable" under relevant safety standards (like OSHA or local equivalent) during the measurement period.
- Total Hours Worked: The sum of all actual hours worked by all employees covered in the incident count during the same period. Do not include vacation, sick leave, or holidays.
- Standardization Factor: This defines the "per X hours" metric.
- 1,000,000 Hours: Common in international reporting, representing the frequency of incidents per million hours worked.
- 200,000 Hours: Often used in North America (OSHA standard), representing the equivalent of 100 full-time employees working 40 hours per week for 50 weeks a year.
Calculation Example
Let's imagine a manufacturing plant operating for one year.
- They recorded 8 reportable injuries.
- Their total workforce logged 450,000 hours worked.
- They want to use the international standard factor of 1,000,000.
The calculation would be: (8 × 1,000,000) / 450,000 = 17.78.
This means the facility experienced 17.78 recordable incidents for every million hours worked during that year.