Difference Between Headcount and FTE, With Examples

The difference between headcount and FTE is simple: headcount counts every person once, whatever their hours, while FTE (full-time equivalent) converts hours into units of full-time work. Headcount answers "how many people work here". FTE answers "how much work capacity do we have" (HRcloud). Two employees working 20 hours each count as two in headcount but equal one FTE.

The rest of this guide covers the formula, the UK baseline question (37.5 or 40 hours), worked examples, and how to decide which number belongs in which report.

The short answer

A team of 10 people can have a headcount of 10 and an FTE of 8. Neither number is wrong. They measure different things, and problems start when a report does not say which one it uses.

What is headcount?

Headcount is a count of individuals. A director on a full-time contract and a colleague on eight hours a week are each one. It is the right number for anything that attaches to a person rather than to hours worked.

The hard part is deciding who is included. Agree and write down your rules for each group:

• Leavers and joiners: are they counted at a snapshot date, or averaged across the period?
• Contractors and temps: are they in headcount, in a separate line, or excluded?
• Zero-hours staff: do you count everyone on the books, or only those who worked in the period?
• Vacancies: an approved but unfilled position is not headcount. It is planned headcount, and it should be shown separately.

There is no single correct answer. The correct answer is the one applied the same way in every report.

What is FTE?

FTE expresses the hours people work as a share of a full-time schedule. One FTE is one person working full-time. Everyone else is a fraction of that.

How FTE works

The basic formula is: FTE = total hours worked ÷ standard full-time hours.

FTE can exceed headcount only if people work more than the standard full-time hours, for example through overtime if you count hours actually worked. On contracted hours it is normally equal to or lower than headcount, because most contracts are at or below full-time.

FTE and WTE

WTE means whole-time equivalent. It is the same measure as FTE (Wikipedia). You will see WTE in the NHS and the wider public sector. If a report mixes the two labels, treat them as one metric but still check the baseline hours.

Headcount vs FTE side by side

The last row comes from a point made by Intious: the same amount of work can show up as very different headcount.

How to calculate FTE (UK method)

Most pages that rank for this topic use a US view: a 40-hour week and 2,080 hours a year. UK employers need a different starting point.

Choose your full-time baseline (37.5 vs 40)

Most UK employers use 37.5 or 40 hours a week, and common standards are 35, 37, 37.5 and 40 (ProRata Calculator UK). The baseline changes the answer. A 37.5-hour worker is 0.94 FTE on a 40-hour baseline but 1.0 FTE if your organisation defines full-time as 37.5 hours (Paycor).

One UK source advises using the contractual full-time hours for the role rather than a round number like 40 (Employers Calculator). Whatever you choose, set it once and apply it everywhere.

Part-time employee example

With a 37.5-hour full-time contract, a person working 22.5 hours a week is 22.5 ÷ 37.5 = 0.60 FTE (ProRata Salary Calculator UK). On the same baseline, 0.8 FTE is 30 hours a week, typically four full working days (same source).

Team example

Take six people at 40 hours and four at 20 hours, with a 40-hour baseline. Headcount is 10. FTE is (240 + 80) ÷ 40 = 8.0 (Intious).

A second example: 50 full-time staff plus 12 half-time staff gives headcount 62 and FTE 56, because 12 half-time people add 6 FTE (Resource Guru).

Annual, monthly and part-year workers

If you calculate from annual or monthly hours, use a matching divisor. On a 37.5-hour week that is 1,950 hours a year (37.5 × 52) and 162.5 hours a month (Dynamics Hub). The US 40-hour equivalent is 2,080 hours a year (Wall Street Prep).

For someone who joins or leaves mid-period, you have two options. Count them as their full contracted FTE at a snapshot date, or weight their FTE by the share of the period they were employed. Both are valid. Pick one and label the report.

Worked examples

A mixed office team

A finance team has three people at 37.5 hours, one at 30 hours and one at 15 hours, on a 37.5-hour baseline. FTE is 3 + 0.8 + 0.4 = 4.2. Headcount is 5. If you reported 5 as the capacity of the team, you would overstate it by 0.8 of a person.

A shift or retail business

A shop has eight staff on contracts of 20 hours a week, on a 37.5-hour baseline. Total hours are 160. FTE is 160 ÷ 37.5 = 4.27. Headcount is 8. If you budget cost from headcount you will be far too high. If you plan lockers, uniforms or system logins from FTE you will be far too low.

A job share

One full-time role is covered by two people, each working half the week. Headcount for the role is 2, FTE is 1.0. The position is still one position. This is where headcount alone misleads, and where a position-based view helps, which we return to below.

When to use headcount and when to use FTE

Pick the metric that matches the thing you are managing.

Use headcount for seats, equipment, licences, span of control and recruitment load

Anything issued per person depends on headcount: laptops, software seats, desks, security passes and onboarding. Managers' span of control and the number of hires to run also follow people, not hours. The same applies to some legal and reporting thresholds, so check which measure the rule uses.

Use FTE for labour cost, capacity and productivity per FTE

Pay, pension and national insurance scale with hours, so cost planning should use FTE. So should capacity planning and ratios such as revenue per FTE. A simple cost example: if a full-time role costs £48,000 a year in total, a 0.6 FTE role in the same grade costs about £28,800 on a pro rata basis. The figures here are illustrative, not benchmarks.

Under the Part-time Workers Regulations 2000, part-time staff get the same hourly rate, pro rata holiday and benefits as full-time colleagues (ProRata Calculator UK). That is why pro rata cost per FTE is a sound planning approach. This source is secondary, so check the rule on gov.uk before you rely on it.

In practice you need both. Plan cost on FTE, and plan seats and licences on headcount, from the same list of positions.

If Finance and HR keep reporting different workforce numbers, you can bring positions, FTE and cost into one plan. See how governed approvals work in Kivos and book a demo to try it on your own figures.

How to convert FTE to headcount (and why it is approximate)

If you know the average FTE per person, estimated headcount is required FTE divided by that average (Intious). For example, you need 56 FTE and your people average 0.9 FTE each. You need about 62 people (56 ÷ 0.9 = 62.2).

It is approximate because the result depends on the mix you actually hire. Two half-time roles and one full-time role cover the same FTE with very different headcount. Use the conversion for rough hiring plans, not for sign-off.

Common mistakes

• Using the wrong baseline. A 40-hour baseline in a 37.5-hour organisation understates FTE for every full-time employee.
• Mixing metrics across reports. One report says 62 and another says 56, and nobody knows why.
• Ignoring vacancies and mid-period changes. Approved but unfilled positions and part-year staff are the biggest source of gaps between plan and actuals.
• Counting contractors inconsistently. If HR excludes them and Finance includes their cost, the numbers will not reconcile.

Most of these are governance problems rather than maths problems. HR often reports people and Finance reports cost, and they differ because they use different definitions. The fix is to agree one definition of full-time hours, one set of inclusion rules and one plan. Our article on headcount governance covers how finance teams set that up, and workforce planning vs headcount planning explains why planning on headcount alone falls short.

A tool helps when positions, FTE and cost sit in one governed plan, so Business, Finance and HR read the same figures. Kivos is built for that, and a clear position approval process keeps new roles from entering the plan with an undefined FTE.

Quick checklist

1. Set the full-time baseline in contractual hours, for example 37.5.
2. Write down who counts as headcount: contractors, zero-hours, leavers, vacancies.
3. Report headcount and FTE side by side, with the date or period basis.
4. Use FTE for cost and capacity, headcount for seats and licences.
5. Keep one list of positions that both Finance and HR use.

If you want to see how leaders get one set of workforce figures, see Kivos for your leaders.

Frequently asked questions

Can headcount be higher than FTE?

Yes, and it usually is when part-time staff are involved. Ten people with a mix of full-time and part-time contracts might give a headcount of 10 and an FTE of 8. Headcount equals FTE only when everyone works exactly the full-time baseline.

How many hours is 1.0 FTE in the UK?

There is no single legal figure. Most UK employers use 37.5 or 40 hours a week, and 35 and 37 are also common. Use the contractual full-time hours for the role and apply the same baseline in every report.

Is WTE the same as FTE?

Yes. WTE stands for whole-time equivalent and measures the same thing as FTE. It is common in the NHS and the public sector.

Should I use headcount or FTE for budgeting?

Use FTE for labour cost and capacity, because pay and benefits scale with hours. Use headcount for items issued per person, such as laptops, licences and desks. Most budgets need both, drawn from the same list of positions.

Do contractors count in headcount and FTE?

It depends on your own policy, so decide it once and state it in every report. Many organisations show contractors on a separate line so that employee headcount and total workforce can both be read. The risk is counting their cost in Finance but excluding them in HR.