Free Attrition Rate Calculator
Calculate employee attrition rate and analyze turnover trends.
Quick answer
Attrition rate = employees who left ÷ average headcount × 100, where average headcount = (headcount at start + headcount at end) ÷ 2. Example: 10 people left in a quarter that started with 100 and ended with 90 staff, so 10 ÷ 95 × 100 = 10.5% for the quarter, or about 42% annualised (× 12 ÷ 3).
Last reviewed November 2026.
How to use the Attrition Rate Calculator
Fill in these fields and the attrition rate calculator works out the rest instantly, in your browser:
- Employees at Start of Period
- Employees at End of Period
- Employees Who Left
- Period (Months)
Worked example
With Employees at Start of Period: 500; Employees at End of Period: 470; Employees Who Left: 45; Period: 12:
| Average Headcount | 485 |
| Employees Who Left | 45 |
| Attrition Rate (12m) | 9.28% |
| Annualized Attrition Rate | 9.28% |
| Industry Benchmark (IT) | 15–25% |
| Industry Benchmark (Manufacturing) | 10–18% |
Frequently asked questions
What is the difference between attrition and turnover?
They are often used interchangeably. Strictly, attrition counts people who leave and are not replaced; turnover counts all leavers whether or not the role is filled again.
How do I annualise a monthly attrition rate?
Multiply by 12 divided by the number of months measured. A 3% monthly rate is about 36% a year.
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