.attrition-calculator-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
background: #fff;
padding: 20px;
}
.calc-container {
background-color: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 30px;
margin-bottom: 40px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.calc-title {
text-align: center;
color: #2c3e50;
margin-bottom: 25px;
font-size: 24px;
font-weight: 700;
}
.form-group {
margin-bottom: 20px;
}
.form-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #495057;
}
.input-group {
position: relative;
}
.form-control {
width: 100%;
padding: 12px;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.15s ease-in-out;
}
.form-control:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 3px rgba(0,123,255,0.25);
}
.btn-calc {
display: block;
width: 100%;
padding: 14px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: 600;
cursor: pointer;
transition: background-color 0.2s;
margin-top: 10px;
}
.btn-calc:hover {
background-color: #0056b3;
}
#attrition-result {
margin-top: 25px;
display: none;
background-color: #ffffff;
border: 1px solid #dee2e6;
border-radius: 6px;
padding: 20px;
}
.result-row {
display: flex;
justify-content: space-between;
align-items: center;
padding: 10px 0;
border-bottom: 1px solid #f1f3f5;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
color: #6c757d;
font-size: 15px;
}
.result-value {
font-size: 20px;
font-weight: 700;
color: #212529;
}
.main-metric {
text-align: center;
padding: 15px;
background-color: #e8f4fd;
border-radius: 6px;
margin-bottom: 15px;
color: #004085;
}
.main-metric .result-value {
font-size: 32px;
color: #007bff;
display: block;
}
.error-msg {
color: #dc3545;
text-align: center;
margin-top: 10px;
display: none;
font-size: 14px;
}
.article-content {
line-height: 1.6;
color: #333;
}
.article-content h2 {
color: #2c3e50;
margin-top: 30px;
border-bottom: 2px solid #007bff;
padding-bottom: 10px;
display: inline-block;
}
.article-content h3 {
color: #34495e;
margin-top: 25px;
}
.article-content ul {
padding-left: 20px;
}
.article-content li {
margin-bottom: 10px;
}
.example-box {
background: #f1f3f5;
padding: 15px;
border-left: 4px solid #6c757d;
margin: 20px 0;
}
function calculateAttrition() {
var empStart = document.getElementById("empStart").value;
var empEnd = document.getElementById("empEnd").value;
var separations = document.getElementById("separations").value;
var resultBox = document.getElementById("attrition-result");
var errorBox = document.getElementById("error-message");
// Convert strings to numbers
var startVal = parseFloat(empStart);
var endVal = parseFloat(empEnd);
var sepVal = parseFloat(separations);
// Validation
if (isNaN(startVal) || isNaN(endVal) || isNaN(sepVal) || startVal < 0 || endVal < 0 || sepVal < 0) {
errorBox.style.display = "block";
resultBox.style.display = "none";
return;
}
// Additional logic check: Average employees cannot be zero for division
var averageEmployees = (startVal + endVal) / 2;
if (averageEmployees === 0) {
errorBox.innerText = "Average employee count cannot be zero.";
errorBox.style.display = "block";
resultBox.style.display = "none";
return;
}
errorBox.style.display = "none";
// Calculation: (Separations / Average Employees) * 100
var monthlyRate = (sepVal / averageEmployees) * 100;
// Annualized Rate = Monthly Rate * 12
var annualizedRate = monthlyRate * 12;
// Display Results
document.getElementById("monthlyRateResult").innerText = monthlyRate.toFixed(2) + "%";
document.getElementById("avgEmpResult").innerText = averageEmployees.toFixed(1);
document.getElementById("sepResult").innerText = sepVal;
document.getElementById("annualRateResult").innerText = annualizedRate.toFixed(2) + "%";
resultBox.style.display = "block";
}
How to Calculate Monthly Attrition Rate
Calculating your monthly attrition rate is a critical task for HR professionals and business managers. It measures the rate at which employees leave your workforce over a specific month. High attrition can signal underlying issues with company culture, compensation, or management, while also incurring significant costs related to recruitment and training.
The Attrition Rate Formula
The standard formula used by most Human Resources departments ensures accuracy by accounting for headcount fluctuations during the month. It compares the number of people who left against the average number of employees for that period.
Formula:
Attrition Rate = (Number of Separations / Average Number of Employees) × 100
To find the Average Number of Employees, you use the following calculation:
Average Employees = (Employees at Start of Month + Employees at End of Month) / 2
Step-by-Step Calculation Example
Let's look at a realistic scenario to understand how the math works:
- Start of Month: You begin September with 200 employees.
- End of Month: You end September with 210 employees (due to new hires).
- Separations: During the month, 5 employees resigned or were terminated.
Step 1: Calculate the Average Headcount
(200 + 210) / 2 = 205 average employees.
Step 2: Divide Separations by Average
5 / 205 = 0.02439
Step 3: Convert to Percentage
0.02439 × 100 = 2.44%
In this example, the monthly attrition rate is 2.44%.
Monthly vs. Annualized Attrition
The calculator above provides both the monthly rate and the projected annualized rate. While the monthly rate tells you what happened in the last 30 days, the annualized rate helps you understand the long-term impact if the current trend continues for a full year.
Annualized Rate = Monthly Rate × 12
What counts as a "Separation"?
When inputting data into the attrition calculator, ensure you include all types of departures to get an accurate picture:
- Voluntary: Resignations, retirement.
- Involuntary: Terminations, layoffs.
Internal transfers (moving from one department to another within the same company) generally do not count as attrition for the company-wide metric, though they might for department-specific calculations.