HR Metric Guide
Retention rate measures how many employees you kept over a period. It looks like the inverse of turnover, but the two answer different questions and are calculated on different populations. This guide clears that up.
HR Metric
Retention Rate
Employees active at the beginning of the period who remain active at the end, as a percentage of the beginning population.
Employees Remaining at End / Employees at Beginning × 100
Required data: employee_id, employment_status, hire_date
View metric definition →Retention is measured on the population that was present at the start of the period: of those people, how many are still here at the end. New joiners during the period are usually excluded from the calculation (they are covered by early-attrition and new-hire metrics instead).
Turnover uses *average* headcount as its denominator and counts *all* leavers, including people who joined and left within the period. Retention uses the *starting* population. In a stable team the two are close; in a fast-growing or high-churn team they can differ by several points. Report both, and be clear which population each one uses.
Example
100 employees are on the books at the start of the year. By year end, 88 of those original 100 are still employed. Retention rate = 88 / 100 × 100 = 88%. Separately, 30 people joined during the year and 4 of them left — that shows up in early attrition, not in this number.
A single retention rate hides *when* people leave. A retention (survival) curve plots the share of a hire cohort still employed at 3, 6, 12, 24 months. A steep drop in the first 6 months points at hiring fit or onboarding; a later drop points at growth, pay or management.
Annual for the headline, with a rolling 12-month view to catch trends. Cohort curves are measured from hire date.
Someone who moves to another team but stays with the company is retained. Departures from the company are what count.
Not on its own. Pair it with performance and regretted-turnover data — you want to keep the right people.
See retention rate, the survival curve and every related metric in the HR Metrics Dictionary.
Open the HR Metrics DictionaryRelated: Employee turnover rate and The HR KPIs that drive decisions.
This article covers a metric that HRlytix calculates automatically.
View the metric definition →How to calculate employee turnover rate, the voluntary/involuntary split, why the denominator matters, and how to investigate a rise instead of guessing.
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