What Is Full-Time Equivalent (FTE)?

Full-time equivalent (FTE) is a unit of measurement that standardises part-time worker hours into a full-time headcount figure — one FTE equals the hours worked by one full-time employee, typically 40 hours per week. Two part-time employees each working 20 hours equal 1.0 FTE. FTE is the standard unit for headcount planning, budget allocation, and workforce reporting because it enables direct comparison between companies and departments with different work-hour structures.

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Why FTE Matters in Recruitment

Staffing firms that invoice clients on a per-FTE basis and miscalculate headcount leave money on the table, or worse, overbill and face a dispute. Full-Time Equivalent (FTE) is the standard unit for expressing workforce size in a way that treats part-time workers proportionally. One FTE equals one employee working standard full-time hours, typically 37.5 to 40 hours per week depending on the jurisdiction. A worker at 20 hours per week counts as 0.5 FTE. Two such workers together equal one FTE.

For workforce planning, FTE is far more useful than raw headcount. A client with 150 employees on paper might have 80 full-timers and 70 part-timers, giving an actual FTE count closer to 115. Planning hiring targets, calculating labour cost ratios, and benchmarking productivity all require the FTE figure, not the headcount figure. In the US, FTE is also the operative measure under the Affordable Care Act's employer mandate, where the 50 FTE threshold determines whether a business qualifies as an applicable large employer subject to healthcare coverage requirements.

In UK public sector and NHS staffing, FTE is the standard reporting unit in workforce returns, making it essential for agencies supplying healthcare professionals to report headcount accurately in FTE terms.

How FTE Is Calculated

The calculation is straightforward. Divide each worker's contracted hours by the standard full-time hours for that role or organisation, then sum the results. If a client's full-time week is 40 hours and they employ five people at 40 hours, three at 20 hours, and two at 10 hours, the FTE count is: (5 × 1.0) + (3 × 0.5) + (2 × 0.25) = 5 + 1.5 + 0.5 = 7.0 FTE from 10 employees.

In a staffing context, a recruitment manager at a healthcare agency supplying NHS trusts needs to report to the client's workforce team in FTE, not in raw body count. If the agency places 12 bank nurses averaging 24 hours per week against a 37.5-hour full-time week, the placement represents 12 × (24 ÷ 37.5) = 7.68 FTE. The trust's vacancy manager uses this figure in their monthly establishment report. Billing arrangements based on a contracted FTE number must use the same formula consistently to avoid reconciliation disputes at month end.

For internal capacity planning, a staffing firm owner trying to determine how many recruiters they can support with current revenue should calculate the firm's own FTE, not just count heads. Three part-time recruiters at 25 hours per week represent 1.88 FTE, not three positions. Labour cost projections built on raw headcount will overstate the actual hours available.

FTE vs Headcount

Headcount is the total number of individuals on the payroll or assignment list, regardless of hours. FTE converts those individuals to a common unit based on hours worked. For day-to-day people management, headcount is the intuitive number. For financial modelling, workforce planning, regulatory compliance, and benchmarking, FTE is the correct unit. A company reporting to investors that it employs 200 people when 60 of them are part-time is not lying, but it is presenting a number that may misrepresent actual labour capacity. FTE normalises that.

FTE in Practice

A managed service provider (MSP) running a contingent workforce programme for a logistics client had a contract structure that set fees based on the number of FTEs the client used in a given quarter, not on individual headcount. At the end of Q3, the client's workforce included 340 active contractors. The MSP calculated FTE at 284 against a 40-hour standard, because a significant portion of the contingent workforce were on 30-hour contracts. Billing was generated against 284 FTE, not 340 heads. The client's finance team verified the calculation against timesheets. No dispute arose, and the reconciliation took two hours instead of the two days it had taken under the previous headcount-based billing model.

Frequently Asked Questions

How do you calculate FTE for part-time employees?
FTE = hours worked per week divided by the standard full-time hours per week. If full-time is 40 hours and an employee works 24 hours per week, their FTE is 0.6. For a team or organisation: sum all hours worked per week by all employees, then divide by the full-time hours baseline. Ten employees working 24 hours each equals 240 total hours divided by 40 standard hours equals 6.0 FTE, even though there are 10 individual employees on headcount.
What is the difference between FTE and headcount?
Headcount is a simple count of individual employees regardless of how many hours each works. FTE converts those individuals into a capacity measure that accounts for working hours. Headcount is useful for understanding the number of employment relationships an organisation manages. FTE is more useful for capacity analysis, cost modelling, and comparing resource levels across teams or time periods where the mix of full-time and part-time employees varies — which is why workforce planning and budget approvals consistently use FTE rather than headcount.
Why do budget approvals use FTE rather than headcount?
Because FTE measures the resource being requested, not the number of individuals. A team requesting budget for three additional FTE might hire three full-time employees, six part-time employees, or a combination. FTE creates a consistent unit that translates directly into cost (FTE multiplied by average salary equals total compensation cost) and capacity (FTE multiplied by productive hours equals output capacity), enabling finance and leadership to compare requests and allocate resources on a common basis.