How Attrition Rate is Calculated

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Employee Attrition Rate Calculator

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How Attrition Rate is Calculated

Attrition rate measures the percentage of employees who leave an organization over a specific period (usually a month, quarter, or year). Unlike turnover, attrition often includes natural departures like retirement or positions that are not immediately backfilled.

The Formula

Attrition Rate = (Number of Leavers ÷ Average Number of Employees) × 100

Step-by-Step Breakdown

  1. Determine Leavers: Count all employees who left the company (voluntarily or involuntarily) during the timeframe.
  2. Calculate Average Headcount: Add your starting employee count to your ending employee count and divide by 2.
  3. Divide and Multiply: Divide the leavers by the average headcount and multiply by 100 to get the percentage.

Practical Example

Suppose you started the year with 200 employees and ended with 190 employees. During that year, 15 people left the company.

  • Average Headcount: (200 + 190) / 2 = 195
  • Attrition Calculation: (15 / 195) * 100 = 7.69%
function calculateAttrition() { var start = parseFloat(document.getElementById('startEmployees').value); var end = parseFloat(document.getElementById('endEmployees').value); var leavers = parseFloat(document.getElementById('leavers').value); var resultDiv = document.getElementById('attritionResult'); var resultValue = document.getElementById('attritionValue'); var feedback = document.getElementById('attritionFeedback'); if (isNaN(start) || isNaN(end) || isNaN(leavers) || start < 0 || end < 0 || leavers 15) { message += "This is considered high in many industries. You may want to investigate the cause of departures."; } else if (attritionRate > 10) { message += "This is a moderate attrition rate. It's worth monitoring trends over the next period."; } else { message += "This is a healthy attrition rate, indicating strong employee retention."; } feedback.innerText = message; }

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