HR CALCULATOR
Turnover, measured against the right base.
Dividing exits by closing headcount overstates attrition in a shrinking team and understates it in a growing one. Average headcount is the honest denominator.
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Calculated on FY 2025-26 statutory rates. Indicative only — confirm against current notifications before filing.
Annual attrition rate
10.91%
Average headcount
220
Exits in period
24
Retained employees
196
Exits against average headcount for the period
Full breakdown
Step-by-step calculation
HOW IT WORKS
The formula used
The denominator matters as much as the numerator.
(Opening + closing) ÷ 2(Exits ÷ average headcount) × 100UNDERSTANDING IT
About the attrition rate calculator
Attrition rate is the most quoted HR metric and one of the most inconsistently calculated. The formula itself is simple; the disagreement is over the denominator.
Using closing headcount flatters a growing organisation and penalises a shrinking one. Using opening headcount does the reverse. Average headcount across the period is the conventional compromise and produces a figure comparable across periods.
It is also worth separating voluntary from involuntary exits. A single blended rate can hide the fact that most departures were performance-related terminations rather than resignations, which points to a very different intervention.
Worked example
Take 24 exits, an opening headcount of 200 and a closing headcount of 240.
Average headcount is (200 + 240) ÷ 2, which is 220. Attrition is 24 ÷ 220 × 100, which is 10.91% for the period. Measured against closing headcount alone it would appear as 10%, and against opening headcount as 12%.
WHY IT HELPS
What this calculator is good for
Compare periods fairly
Average headcount keeps the figure comparable as the organisation grows.
Segment the analysis
Run the same calculation by department or tenure band to find where attrition concentrates.
Support cost modelling
Attrition rate feeds directly into replacement and hiring cost forecasts.
WATCH OUT
Common mistakes
These are the errors that most often produce a wrong number.
Using closing headcount as the denominator in a growing organisation.
Combining voluntary resignations and involuntary terminations into one figure.
Comparing a monthly rate against an annual rate without annualising.
Excluding fixed-term and contract exits without saying so.
HR TIPS
Practical guidance
Split voluntary and involuntary
The two have different causes and different remedies.
Track by tenure band
Early-tenure attrition usually points at hiring or onboarding rather than culture.
Annualise short periods
A monthly figure multiplied by twelve is not the same as an annual rate.
QUESTIONS
Attrition Rate Calculator — frequently asked
Divide the number of exits during the period by the average headcount for that period, then multiply by 100. Average headcount is opening plus closing divided by two.
It varies sharply by sector. Technology and retail typically run higher than manufacturing. The more useful benchmark is your own trend over time and against sector peers.
The terms are often used interchangeably. Where a distinction is drawn, attrition refers to departures where the role is not backfilled, while turnover includes all departures.
Results are indicative and computed on FY 2025-26statutory rates using conventional salary-structure assumptions. Your actual figures depend on your employer’s structure, your state and your declarations. Confirm against current notifications before relying on these numbers for filing.
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