How to Calculate Employee Turnover Rate
Learn how to calculate monthly and annual employee turnover rate, understand voluntary vs. involuntary turnover, and benchmark your numbers against industry averages.
What Is Employee Turnover Rate?
Employee turnover rate measures the percentage of your workforce that leaves and must be replaced over a given period. High turnover is expensive — the Society for Human Resource Management estimates that replacing an employee costs 50–200% of their annual salary when you account for recruiting, onboarding, lost productivity, and training. Tracking turnover gives HR teams an early signal of engagement problems, compensation gaps, or management issues before they escalate.
The Basic Turnover Formula
Turnover Rate = (Number of Separations / Average Number of Employees) × 100. Average employees = (Employees at Start of Period + Employees at End of Period) / 2. For example, if you started January with 200 employees, ended with 190, and had 15 departures during the month, the average headcount is 195 and the monthly turnover rate is (15 / 195) × 100 = 7.69%. To annualize a monthly rate, multiply by 12, though compounding gives a more precise annual figure.
Voluntary vs. Involuntary Turnover
Voluntary turnover occurs when employees choose to leave — resignations, retirements, or departures for better opportunities. Involuntary turnover occurs when the employer initiates the separation — layoffs, terminations for cause, or contract non-renewals. These two types require different interventions. High voluntary turnover signals dissatisfaction with pay, culture, or growth prospects. High involuntary turnover may indicate poor hiring practices, performance management failures, or business contraction.
Retention Rate: The Flip Side
Retention Rate = 100% - Turnover Rate, but only when measured over the same period with the same employees. A more precise retention rate focuses on original employees still present at period end: Retention Rate = (Employees who stayed the entire period / Employees at start of period) × 100. If you started with 200 employees and 175 of them were still present 12 months later (regardless of new hires), your retention rate is 87.5%. Retention and turnover rates answer different questions and should both be reported.
Industry Benchmarks
Average annual turnover varies sharply by industry. Retail and food service regularly see rates of 60–100% or higher. Healthcare runs 20–30%, with nursing roles often exceeding 30%. Technology typically sees 13–20% and often treats this as acceptable given the competitive talent market. Finance and insurance average around 15–20%. Professional services firms often target sub-15% annual turnover. Comparing your rate to the industry median is more meaningful than comparing to an economy-wide average.
Cost of Turnover Calculation
Total Turnover Cost = Separation Costs + Vacancy Costs + Recruitment Costs + Onboarding Costs + Productivity Ramp Costs. A simple estimate for a mid-level employee earning $60,000 per year: separation processing ~$500, lost productivity during vacancy ~$5,000, recruiting fees or job board spend ~$3,000, interviewing time ~$1,500, training and onboarding ~$2,000, and a productivity ramp of 60–90 days worth ~$10,000. Total: roughly $22,000 per departure, or 37% of annual salary — at the low end of SHRM estimates.
Reducing Turnover: Actionable Steps
Exit interview data is the most direct input for diagnosing turnover causes. Analyze responses by department, manager, tenure cohort, and role level. Stay interviews — proactive conversations with current employees about what would make them leave — often reveal issues earlier. Compensation benchmarking against market data (Radford, Mercer, Levels.fyi for tech) ensures you are not losing people purely to pay gaps. Finally, promoting internally when possible improves retention because it signals a credible path for advancement.
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