What Is Employee Turnover Rate?
Employee turnover rate measures how frequently staff leave your business. Learn how to calculate it, benchmark it, and reduce it.
Key Takeaways
- Turnover rate = (number of leavers / average headcount) x 100
- Voluntary turnover (employees who choose to leave) is the most actionable metric
- UK average turnover is approximately 15% per year — retail and hospitality are significantly higher
- Replacing a leaver typically costs 50-200% of their annual salary when all costs are included
What employee turnover rate is
Employee turnover rate measures the proportion of your workforce that leaves the business in a given period, typically expressed as an annual percentage. High turnover is expensive, disruptive to team performance, damaging to customer relationships, and often a symptom of deeper management or culture problems. Monitoring turnover — and specifically understanding why people are leaving — is fundamental to building a stable, high-performing organisation.
How to calculate it
Turnover rate = (number of employees who left during the period divided by average headcount) multiplied by 100. Average headcount is (opening headcount + closing headcount) divided by 2. For example: 8 leavers in a year with average headcount of 52 gives a turnover rate of 15.4%. Calculate separately for voluntary leavers (those who chose to leave) and involuntary leavers (dismissed, made redundant, or retired) — these have different implications and different solutions.
What a healthy turnover rate looks like
There is no universally healthy turnover rate — it varies significantly by sector, role type, and business model. The UK average across all sectors is approximately 15% per year. Retail and hospitality typically run at 30-60%. Professional services and technology companies typically aim for 10-15%. Very low turnover is not always desirable — some turnover brings fresh perspectives and prevents stagnation. Very high voluntary turnover above 25-30% in most sectors almost always signals a problem.
The cost of turnover
The true cost of replacing a leaver is typically underestimated. Direct costs: recruitment fees, job boards, management time, onboarding and training, severance if applicable. Indirect costs: productivity loss during the vacancy, reduced output while the replacement comes up to speed (typically 3-6 months for a knowledge worker), impact on team morale, and lost institutional knowledge. Studies consistently estimate that replacing a knowledge worker costs 50-200% of their annual salary.
Exit interviews and retention strategies
The most important source of information about why people are leaving is exit interviews. Aggregated exit data reveals patterns: if 60% of leavers cite management quality, that is a leadership development issue. If 50% cite compensation, that is a market positioning issue. If 40% cite career development, that is a progression framework issue. Turn exit interview insights into retention actions — then track whether voluntary turnover declines as a result.