Employee Retention Rate Calculator

The employee retention rate formula

Retention rate = (employees at the start who were still there at the end ÷ employees at the start) × 100

That is the whole formula, and every argument about retention rate is really an argument about the denominator. It is your starting headcount. Not your average headcount, not your ending headcount, and not your starting headcount plus everyone you hired along the way. Retention answers one question: of the people you had, how many did you keep?

Worked through with the calculator's default numbers: you open the year with 100 people and 8 of them resign or are let go. 100 − 8 = 92 stayers, 92 ÷ 100 = 0.92, so your retention rate is 92%. The 20 people you hired during the year do not appear anywhere in that calculation, and neither do the 4 of them who left again.

Why retention rate and turnover rate don't add up to 100%

This is the single most common mistake in retention reporting, and it survives because it is nearly true. If nobody joins or leaves mid-period and you use the same denominator for both, retention and turnover really are mirror images. Real companies hire, so they are not.

Two things pull them apart:

• Different numerators. Turnover counts every separation. Retention only counts departures from the starting group. Someone hired in March and gone by September is a turnover event and is invisible to the retention rate.
• Different denominators. Turnover is conventionally divided by average headcount, the mean of your starting and ending numbers. Retention is divided by starting headcount. If you grew during the period, the turnover denominator is the larger of the two.

Run the defaults and you get 92% retention alongside 11.5% turnover, which sums to 103.5%. Nothing is wrong. They are two honest measurements of two different things. The practical rule: publish both numbers, state the denominator next to each, and never derive one by subtracting the other from 100. A reader who sees "92% retention" and calculates 8% turnover has just understated your actual churn.

What counts as a leaver

The formula is easy. Deciding who goes into it is where teams lose comparability. A few rules worth writing down once and then never changing:

• Count both voluntary and involuntary exits unless you are deliberately reporting one of them, in which case say so in the label. Many teams report an overall rate plus a separate voluntary rate, which is the more useful pair.
• Internal transfers are not departures. Someone moving from support to sales is still retained at company level, even though the support team's own rate should show them as a loss. Pick the level you are measuring and be consistent about it.
• Contractors usually sit outside both numbers. A planned contract end date is not a retention failure, and including it makes your rate move for reasons that have nothing to do with how people are managed.
• Split regrettable from non-regrettable. This is the refinement worth the most. Losing people you actively wanted to keep is a different problem from performance exits, and a single blended rate hides it. See the retention metrics scorecard for how to structure that split.

New-hire retention: the number the headline rate hides

Because the standard formula ignores everyone hired inside the period, it will happily report a healthy retention rate while your new joiners churn out the back door. That is why this calculator asks for the second cohort separately and reports a new-hire retention rate on it.

Read the two together. Strong headline retention with weak new-hire retention points at hiring, onboarding, or a gap between the job you advertised and the job that exists, not at your long-tenure engagement work. Weak headline retention with strong new-hire retention points the other way: something is wearing down the people who have been there a while. Same inputs, opposite fixes.

What to do with the number

A retention rate is a lagging indicator. By the time it moves, the decisions that caused it were made months earlier, which is why the useful next steps are all about getting ahead of it:

• Trend it, don't benchmark it. Your own rate quarter over quarter, segmented by team and tenure band, tells you far more than a cross-industry average built on a different definition of "leaver" than yours.
• Put a cost on the gap. The turnover cost calculator turns the percentage into a number a budget conversation can use.
• Find out why while people are still there. Stay interviews ask the exit-interview questions of people who have not quit, which is the only time the answers are still actionable.
• Watch the leading signals. Retention rate tells you what already happened. Flight risk indicators tell you what is about to, and you can score one person in a couple of minutes with the flight risk assessment.

Related calculators

If turnover rather than retention is the number you report, the turnover and attrition rate calculator takes a single separations figure and annualizes monthly and quarterly rates for you. Use this page instead when you want the retention rate to be exact about which cohort it describes.