How to Calculate Employee Turnover: Formula, UK Benchmarks and Real Cost

Employee turnover rate is calculated as (number of leavers ÷ average headcount) × 100, expressed as a percentage over a defined period, usually annual. That's the basic formula. In practice, calculating turnover meaningfully means knowing whether to count all leavers or just voluntary ones, understanding what the resulting number means for your business, and translating the rate into the real cost of replacing people.

The formula for how to calculate employee turnover is straightforward, but the maths downstream is where the surprise sits. This guide walks through the formula step by step, works through examples you can apply to your own team, shows what UK turnover looks like by industry, and shows how to turn a turnover rate into a defensible replacement cost figure. The point is not to make the number look worse than it is. The point is to make the calculation you would want to have made before the next resignation lands.

The employee turnover rate formula

The core formula for employee turnover rate is simple. Three components, one calculation.

Three components matter, and each one needs a definition.

Applied to a UK SME with 50 average headcount losing 8 people in the year, the calculation is (8 ÷ 50) × 100 = 16%. That number is the starting point, not the answer. What it means depends on the sector, the roles, and whether the 8 leavers were voluntary or involuntary, all of which we work through below.

A worked example: applying the formula to your team

Take a UK B2B consultancy with 50 employees at the start of the year and 52 at the end. Average headcount is (50 + 52) ÷ 2 = 51. Over the year, 8 people left the business. The turnover rate is (8 ÷ 51) × 100 = 15.7%, which rounds to 16%.

The 16% figure is above the 15% band typically considered healthy for professional services but below the 34% UK average reported by CIPD. So far, the picture is mixed but not alarming.

Now break the 8 leavers into voluntary and involuntary. Six resigned (voluntary). Two were let go for performance reasons (involuntary). The voluntary turnover rate is (6 ÷ 51) × 100 = 11.8%, and the involuntary rate is (2 ÷ 51) × 100 = 3.9%. Voluntary turnover in the low teens is broadly healthy for a UK consultancy and suggests retention is working. Involuntary turnover of 4% suggests the business is managing performance actively rather than letting problems persist.

Now break the 6 voluntary leavers by role. Two were senior consultants (six-figure salaries, hard to replace, high client relationship value). Four were associate consultants (mid-five-figure salaries, standard progression exits at 18-24 months). The senior departures are the ones that will hurt the P&L. The junior departures are expected churn in a consultancy environment where up-or-out progression is the norm.

A single 16% number tells you very little. The same rate can mean "healthy, expected exits" or "we are losing our senior team". The full picture only emerges when you segment leavers by voluntariness, role level, and cost of replacement.

Voluntary vs involuntary turnover: why the distinction matters

Two different problems produce two different types of turnover, and mixing them together makes both harder to diagnose.

Regretted turnover: the subset that matters most

A subset of voluntary turnover that some businesses track separately is regretted turnover, meaning voluntary leavers the business would rather have kept. The distinction is useful because losing a strong performer to a competitor is a very different signal from losing a weak performer who was probably on the way to a performance conversation anyway. Regretted turnover is the leading indicator of a retention problem. Non-regretted voluntary turnover can even be healthy at moderate levels because it clears space for new energy in the team.

The practical implication: calculate all three (total, voluntary, regretted) and track them separately over time. A rising regretted turnover rate is the number that should trigger a retention review. A rising involuntary turnover rate is the number that should trigger a management or hiring review.

UK employee turnover benchmarks by industry

CIPD's benchmarking analysis, drawn from the UK Annual Population Survey, puts the total UK employee turnover rate at around 34% for the most recent full period analysed. That breaks down into approximately 27.4% of employees moving to another employer within the year, and a further 6.6% who leave the workforce entirely for reasons including retirement, study, long-term sickness, or caring responsibilities.

Not everyone in the 34% figure is going to a competitor, though roughly four in five are. Comparing your rate against the 34% national average is misleading because the range across sectors is enormous.

Hospitality, retail, and consumer-facing services run the highest turnover rates in the UK economy, often 50% or higher. These figures are structural: shift-based work, minimum-wage-adjacent compensation, high student and part-time populations, and seasonal demand cycles.

Technology and SaaS businesses typically report 20% to 30% turnover. Financial services, insurance, and professional services run lower, typically 10% to 15%. Manufacturing had overall turnover of 10.85% in 2024 per Make UK's Labour Turnover Report, with voluntary turnover as low as 6.24%.

The takeaway: a 20% turnover rate in a hospitality business is exceptionally good. The same rate in a professional services firm is potentially a serious problem. Context is everything. For the full sector-by-sector breakdown including sub-sectors, see our sibling guide, Employee Turnover Rates by Industry (UK 2026).

A reasonable framework for UK SMEs

For UK SMEs specifically, voluntary turnover:

• Under 10% suggests strong retention (or possibly stagnation)
• 10% to 20% suggests normal exits
• 20% to 30% suggests some retention pressure worth investigating
• Above 30% suggests a structural retention problem that needs addressing

From turnover rate to cost: what a leaver costs your business

The turnover rate tells you how often people leave. The cost of turnover tells you what that costs the business, and this is where the numbers get uncomfortable.

The commonly-cited range is 50% to 200% of the departing employee's annual salary. The original UK benchmark study, Oxford Economics' Cost of Brain Drain report, calculated the average UK cost of losing an employee earning over £25,000 at £30,614, which adjusts to around £42,000 in 2026 pounds after inflation. More recent research from CIPD and other UK employment analysts consistently places the range between 50% and 200% of annual salary. The lower end applies to entry-level roles and the upper end to senior specialists.

The wide range is because turnover cost is not a single line item. It is several costs layered together:

Multiply these costs by your annual number of leavers and the P&L impact becomes visible. Two mid-level leavers a year on £45,000 salaries cost the business £76,000 in replacement costs alone, which for many UK SMEs is more than their annual training budget or their marketing spend.

For the purposes of understanding your own turnover rate, the shorthand rule of thumb is: multiply your annual number of leavers by roughly 75% of their combined annual salaries. That gives you a working estimate of turnover cost that is defensible against the primary source data above. For the deeper component-by-component analysis for CFOs and finance leads, see our sibling guide, The Real Cost of Losing a UK Employee.

What your turnover rate is telling you

A calculated turnover rate is not by itself an answer. It's a diagnostic. What it tells you depends on comparison against relevant benchmarks and understanding the composition of your leavers.

Role-specific voluntary turnover ranges

The five-band framework above gives a headline read. For a more precise diagnostic, breaking your turnover down by role type against typical UK ranges tightens the picture.

Entry-level and high-volume customer-facing roles (sales development, junior customer support, early-career operations) typically run 30% to 45% voluntary turnover in the UK. This is the highest-turnover cohort in most knowledge work. If your SDR turnover sits here, you have a common industry pattern rather than a company-specific problem, but the cost still adds up quickly.

Junior specialist roles (junior developers, junior analysts, associate consultants, marketing executives) typically sit in the 20% to 30% band. These are the standard progression exits at 18-24 months as people move to their next role or company. The cost per leaver is lower than for senior roles, but volume can be high.

Mid-level specialists (mid-level engineers, marketing managers, senior analysts, project managers) typically sit in the 15% to 25% band. Above 25% for this group is usually the earliest sign of compensation drift versus the wider market or blocked progression, both of which get expensive fast because these are the roles the business relies on to deliver.

Senior specialists and department heads typically sit in the 10% to 15% band. This cohort is expensive to replace both in headline cost (senior salaries plus recruitment fees) and in institutional knowledge loss. Anything above 20% at this level warrants a management or role-design review, not just a compensation one.

Executive and leadership roles typically sit in the 5% to 10% band. Individual departures are disproportionately expensive but statistically rare in well-run businesses. Above 10% at this level is usually a signal of a governance or strategic issue rather than an operational retention one.

Segmenting by tenure adds further precision. High turnover in the first 12 months of employment usually points to a hiring problem (wrong people being hired, or the role being misrepresented in the interview). High turnover in the 18-36 month range usually points to a career progression or compensation problem. High turnover among senior staff points to something structural that senior people can see and junior people cannot.

The structural alternative: SA teams through Legends EOR

The most effective retention levers for UK SMEs in 2026 are well-documented, and none of them are surprising. Compensation at or above market, career progression that is visible and achievable, management quality, workload sustainability, and cultural fit are the recurring themes across every credible retention study. Improving any one of these will typically move the turnover number over a 12-month period. Our sibling guide How to Reduce Employee Turnover walks through the eight-lever framework.

What is less discussed is the alternative that some UK SMEs have quietly adopted over the last five years: reducing turnover exposure by building teams in labour markets where turnover is structurally lower. South Africa is one such market. UK SMEs employing knowledge workers in South Africa through an Employer of Record typically report lower turnover than their UK equivalents for the same roles. The reasons are structural to the SA labour market: less job-hopping culture, longer tenure norms, stronger workplace stability, and a competitive job market that rewards employers who invest in retention.

Two concrete cases from Legends EOR clients

For UK businesses running the calculation, this changes the maths in two directions at once. The lower cost of employment in SA (typically 40% to 60% below the UK equivalent on a like-for-like basis) is the headline number. The lower turnover is the compounding one. If your UK business is losing two mid-level people a year at £38,000 replacement cost each, an equivalent SA team retaining those two people is not just saving on salary but also removing the £76,000 annual cost of replacing them.

None of this suggests offshoring is the answer to every UK retention problem, or that SA hires never leave. Both statements would be untrue. But for UK SMEs whose turnover cost is high because their UK replacement cost is high, offshore team stability changes the underlying maths, and it deserves a look before the next resignation lands.

Run the numbers on your own team

If you have just had a resignation, or you are running the calculation before the next one, the formulas above give you the framework. The turnover rate itself takes minutes to calculate. The replacement cost takes longer, but the shorthand of 75% of annual salary per leaver is defensible against the primary source data and gets you within striking distance of the real number.

To see what the same roles would cost in South Africa (with lower turnover as part of the picture), the Legends EOR Salary Benchmarking Tool shows current SA salaries in pounds sterling with the EOR fee included.