Employee turnover rate is the share of your workforce that leaves during a period. The usual calculation is leavers divided by average headcount, multiplied by 100. The arithmetic is easy. The argument in the leadership meeting usually starts with who was counted, which departures matter, and what the number actually tells you.
The same departures can tell two different stories
If your business starts the year with 200 employees and ends with 240, a simple opening-and-closing average gives you 220. With 33 departures, annual turnover is 15%. Your own target should reflect your workforce and the reasons people leave.
Now separate those 33 departures. If 18 were voluntary resignations, voluntary turnover is about 8.2% using the same denominator. If nine were planned fixed-term contract endings, treating them as a retention failure would point the business toward the wrong response. Keep the overall figure, but show the categories alongside it.
Rapid growth makes a two-point average less representative. A business that hired 40 people in December did not have those people available all year. Monthly average headcount can give a more useful denominator, provided you describe the method and keep it consistent between periods. Do not quietly switch methods to make the trend look better.
| Measure | Example |
|---|---|
| Opening headcount | 200 |
| Closing headcount | 240 |
| Average headcount | (200 + 240) / 2 = 220 |
| All departures | 33 / 220 × 100 = 15% |
| Voluntary departures | 18 / 220 × 100 ≈ 8.2% |
Choose the turnover measure
Decide whether you are measuring all separations or a narrower group such as voluntary departures. State whether retirements, fixed-term contract endings, internal transfers, and other cases are included. Keep the definition with the report.
Do not quietly change the population when a result looks unusual. If your definition changes, explain the break in the series.
Work through an example
Suppose an organization starts a quarter with 200 employees, ends with 220, and records 12 departures under its chosen definition. Using the average of opening and closing headcount gives 210. The turnover rate is 12 divided by 210, multiplied by 100, or approximately 5.7% for the quarter.
Use your own headcount and departure figures for the period you want to measure. If headcount changes substantially within the period, a more frequent average may represent exposure better than two snapshots. Document the method you choose.
Keep the period consistent
A quarterly rate is not directly comparable with an annual rate. Avoid multiplying a short-period result and presenting it as an observed annual outcome. If you annualize for a particular analysis, label the estimate and its assumptions clearly.
Use rolling periods when they help reduce noise, but preserve enough detail to identify sudden changes. A smooth annual average can hide a recent problem.
Check the records behind the number
- Confirm departure dates and employee identifiers.
- Remove duplicate events and identify rehires correctly.
- Separate internal moves from organization exits.
- Review missing or inconsistent reason codes.
- Use the same population rules for departures and headcount.
The BLS Job Openings and Labor Turnover Survey offers external US turnover statistics. Its definitions and methodology may differ from your internal calculation, so read those before drawing comparisons.
Interpret the rate with context
Break down patterns only where the population is large enough and access is appropriate. Consider role type, tenure, seasonality, and organizational change. A rate identifies movement; it does not establish why people left.
Use the result in an HR dashboard alongside relevant operational context. If you move toward turnover prediction, keep this basic measurement discipline: a sophisticated model cannot compensate for inconsistent definitions or unreliable departure records.
The number should lead to a better question
Break the result down by tenure, role, location, and departure type where the groups are large enough to protect confidentiality. An increase concentrated among employees in their first three months calls for a different conversation from a rise among experienced engineers.
Check the actual counts before reacting to percentages. Two departures from a ten-person team produce a striking rate without telling you why anyone left. Combine the number with exit feedback, manager changes, workload, and hiring history. A turnover dashboard should help you choose where to investigate, not provide a league table for blaming managers.
Updated October 4, 2026.
