How To Calculate Employee Turnover

Employee turnover is the percentage of the workforce that leaves during a period. It is the headline HR metric because it prices recruiting, onboarding and lost productivity in a single number.

The denominator is the average headcount, not the starting count. A team that grows during the period would otherwise produce an inflated rate, and one that shrinks would produce a deflated one.

Average headcount is the starting count plus the ending count, divided by two. Starting at 120 and ending at 130 gives 125, which is the fair base for a period that saw both hires and departures.

The calculation is separations divided by that average. Eighteen leavers against 125 is 0.144, so the turnover rate is 14.4 percent for the period.

Retention is the complement. One minus 0.144 is 0.856, so 85.6 percent of the average workforce stayed. Reporting both is common because each is easier to read for a different audience.

Turnover splits into voluntary and involuntary. People who resign are voluntary, and dismissals are involuntary, and the two need very different management responses. Always report them separately as well as combined.

Annualising makes periods comparable. Multiply a half year rate by twelve over six to see the yearly pace, so a 28.5714 percent half-year rate annualises to 57.1429 percent.

Regrettable turnover is the subset worth worrying about. Losing a poor performer can help, while losing a strong one costs several times the salary, which is why quality of departure matters more than the raw count.

New hire turnover is tracked separately. Someone leaving within the first ninety days points at recruiting or onboarding rather than at the job market.

Industry benchmarks vary enormously. Retail and hospitality can run above 60 percent annually while professional services sit closer to 10 or 15, so a rate only means something against a comparable peer group.

The cost of replacement is usually estimated between half and twice the annual salary. Recruiting, interviewing, training and the ramp to full productivity all land on the cost of a single departure.

Seasonality distorts short windows. Retail spikes in January and drops in the spring, so a single quarter is a poor guide and a rolling twelve month figure is more honest.

Turnover is usually reported monthly or quarterly, but the annual figure is the one that appears in the annual report and in benchmark surveys.

A team that shrinks through attrition rather than layoffs shows a high turnover rate even though nobody was dismissed, which changes how the number should be read.

Replacement cost is usually expressed as a multiple of salary, and multiplying by the number of separations gives the annual price of the rate.

Engagement surveys are the usual companion metric, because a falling engagement score tends to precede a rising turnover rate by a quarter or two.

Benchmarking only works against peers of similar size and sector, since a 50 person firm and a 5000 person firm have very different natural rates.

First year turnover is tracked separately, because a leaver inside ninety days points at the hiring or onboarding process rather than at the job.

Reporting the rate alongside the average headcount lets a reader see whether a jump came from more departures or from a smaller base.