The formula
How to calculate employee retention rate
Retention rate measures how many of the people who started the period are still there at the end. It deliberately ignores new hires, which is what distinguishes it from turnover measured against average headcount.
Excluding new starters is the point. A business that hires 40 people and loses 16 of its originals has 87% retention regardless of the growth, and that separates the leaving problem from the hiring one.
What to enter:
- Employees at the start
- Of those, still employed at the end
Results appear immediately — there is nothing to submit. Changing a field rewrites the link, so you can share the exact scenario you are looking at.
Some of the fields above will accept figures that seem unusual for your own situation, and that is deliberate: the formula behind employee retention rate works the same way regardless of scale, so the calculator does not stop you testing a hypothetical scenario a long way from your actual numbers — often the fastest way to see which input the result is most sensitive to.
Why employee retention rate matters
The formula behind employee retention rate is standard and has not changed in decades; what changes is the situation it gets applied to. Two households can run the identical calculation and land on very different conclusions once their own numbers — income, rate, term, balance — are dropped in, which is why a generic textbook example is less useful than a calculator you can adjust to match your own circumstances.
It is also useful as a sense check before signing anything. A quote, an offer letter or a spreadsheet from someone else can contain an error, an optimistic assumption, or simply a different convention for rounding — running the same inputs through an independent calculator is a quick way to confirm a number before relying on it.
It is also worth being clear about what a single figure like this can and cannot settle on its own. It answers the specific question the formula was built to answer, and nothing more — a favourable employee retention rate result does not automatically mean a decision is a good one overall, since plenty of other factors that a formula cannot capture, from personal circumstances to how comfortable a commitment feels, usually matter just as much as the arithmetic. Use the number as one solid input among several rather than the whole of the decision.
Where the same calculation needs to be run for several different scenarios side by side — three loan offers, two savings plans — the fastest approach is usually to open the calculator in a second browser tab for each one, so that the results can be compared directly rather than overwriting each other in a single set of fields.
Worked example
Work through the defaults on this page:
- Employees at the start: 120
- Of those, still employed at the end: 104
That gives:
- Retention rate: 86.67 %
- Turnover rate: 13.33 %
- Implied average tenure: 7.5 years
These figures are only the calculator's own starting values, included so the working is visible rather than hidden inside the tool above. Replace them with your own numbers and the same arithmetic applies — nothing about the method changes, only the inputs feeding it.
Reading the result
The implied tenure figure translates the rate into something concrete: 87% annual retention means the average employee stays around seven and a half years, assuming the rate holds.
Where this goes wrong. Measuring over too short a period. Quarterly retention of 96% sounds strong and annualises to roughly 85%, so always state the period alongside the figure.
A useful check on any unfamiliar result is to compare it against a rough mental estimate first — round the inputs to convenient numbers and see whether the calculator's answer lands in roughly the same territory. A wildly different figure usually means one of the fields was entered in the wrong unit, most often a percentage typed as a whole number where a decimal was expected, or the reverse.
Above 85% a year for most sectors, above 90% for professional and technical roles. Hospitality and retail routinely sit below 70% and manage around it.
Nearly, but the denominators differ. Retention uses the opening headcount; turnover usually uses average headcount, which includes new hires. In a fast-growing business the two figures diverge noticeably.
It returns retention rate. With 120 employees at the start and 104 of those, still employed at the end, that comes to 86.67 %. Change any field and the figure moves with it.
Whenever one of the underlying figures changes — a new interest rate, a different balance, an updated term — since the result only reflects what is currently in the fields. There is no need to keep a separate record of past results; the web address for a filled-in version already carries the figures used to produce it.
Not unless a tax rate or a fee is explicitly one of the inputs above. Where it is not, the figure shown is a gross calculation, and any tax due depends on your personal circumstances and current tax rules, which are worth checking separately.
The arithmetic itself is exact — the calculator applies the formula shown above precisely, with no rounding until the final figure is displayed. The uncertainty, where it exists, is entirely in the inputs: an estimated rate or an approximate balance carries that same approximation through to the result.