Attrition is quoted often, and defined in several different ways. The number only means something if you state the period, the headcount basis and whether involuntary exits are included.
(Separations / Average headcount) × 100. Annualised if period < 1 year.
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Average headcount = (opening + closing headcount) ÷ 2.
Period rate = separations ÷ average headcount × 100.
Annualise by scaling the period rate to twelve months.
12 separations against an average headcount of 200 over six months is a 6% period rate, or 12% annualised.
It varies enormously by sector — Indian IT services has historically run far higher than manufacturing. Track your own trend and segment it before comparing to anyone else.
Include them in total attrition, but report voluntary attrition separately. Mixing them hides the signal you are actually looking for.
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