The guide
How the attrition rate calculator works
What the attrition rate calculator does
Enter the number of employees who left in a period and the average headcount over that period, and get the attrition rate and its mirror, the retention rate. It is the fastest read on whether a team is holding together, and the metric most boards ask about after revenue.
How the calculation works
Attrition rate = employees who left ÷ average headcount × 100. Retention rate = 100 − attrition rate. Average headcount is usually (headcount at start + headcount at end) ÷ 2, or the mean of monthly headcounts for a more accurate annual figure. Count all leavers, voluntary and involuntary, for the headline number, then split them to understand it.
Worked example
12 leavers in a year against an average headcount of 150. Attrition = 12 ÷ 150 × 100 = 8.0%. Retention = 92.0%. If 9 of the 12 were voluntary, voluntary attrition is 6.0%, and if 5 of those left within their first year, early attrition is the problem to solve first.
What a normal attrition rate looks like
It depends heavily on sector. IT services and BPO in India have run at 15% to 25% or higher in tight markets; manufacturing and government are far lower. Across the US, total separations have averaged roughly 3.5% to 4% a month in recent years. A useful rule: compare your voluntary rate with your sector, and treat any rise of more than a few points in a year as a signal, whatever the absolute level.
Reducing attrition starts at hiring
The most expensive attrition is early attrition, someone who leaves inside twelve months, because you pay the hiring cost twice. Most of it traces to a mismatch that was visible before the offer: the skills were not there, the working style did not fit, or the role was oversold. Screening on skills and a short personality inventory before the interview, and being straight about the job, cuts early leavers more than any retention programme after the fact.
