A Full-Time Equivalent (FTE) is a metric that indicates how many full-time positions the actual hours worked by all employees – including part-time staff, mini-jobbers, and casual workers – would amount to in total. It enables the comparison of workforces with different working time arrangements on a uniform basis. The calculation is done by dividing the total working hours of all employees by the standard full-time hours defined by collective agreement or company policy.
What Is a Full-Time Equivalent (FTE)?
A Full-Time Equivalent (FTE) is a calculated figure used in HR controlling and workforce planning. It indicates how many notional full-time positions the total working hours of all employees in a company correspond to – regardless of whether individuals work full-time, part-time, in a mini-job, or under any other working time arrangement.
FTE therefore does not reflect the number of people (headcount) in a company, but rather the aggregated working capacity. In German-speaking countries, the term Vollzeitäquivalent (VZÄ) is used. In France, the equivalent is ETP (Équivalent temps plein). The calculation logic is identical across all variants.
The OECD defines the FTE as a standardised unit for measuring employed persons, converting part-time employment into full-time units based on hours actually worked.
Calculating the Full-Time Equivalent – Formula and Examples
The Basic Formula
The FTE calculation follows a straightforward formula:
FTE = Weekly working hours of the employee ÷ Standard full-time weekly hours
The reference figure is the collectively agreed or company-defined full-time working week – commonly between 35 and 40 hours per week, depending on sector and collective agreement.
Step-by-Step Calculation Example
A company employs five people with the following working hours (full-time = 40 h/week):
The headcount is 5 (five people), while the FTE is 3.30 – meaning the company has the equivalent of just 3.3 full-time positions filled.
Special Cases: Mini-Jobs, Parental Leave, and Student Employees
In practice, a number of special cases arise that need to be handled carefully in FTE calculations:
Mini-job: A mini-job with a typical 10 hours per week results in an FTE of 0.25 against a full-time base of 40 hours. The contractually agreed number of hours in the employment contract is always the determining factor.
Parental leave: Employees on full parental leave with no working obligation are generally not included in the active FTE. If they are working part-time during parental leave, their part-time hours are included on a pro-rata basis.
Student employees (Werkstudenten): Student employees are treated like regular part-time workers – their contractual weekly hours are divided by the full-time base.
Apprentices/trainees: Depending on the reporting purpose and company practice, apprentices may either be included in the FTE or reported separately. There is no uniform statutory requirement; the applicable statistical or company-specific rules apply.
Headcount vs. Full-Time Equivalent – What Is the Difference?
Headcount and FTE are frequently confused or used interchangeably in practice – yet they measure fundamentally different things:
- Headcount counts all employees as individuals, regardless of their working hours. One person = one head.
- FTE weights employees according to their actual working time, making them comparable.
A company with 20 employees, 10 of whom work 50% part-time, has a headcount of 20 but an FTE of only 15. For budgeting, productivity measurement, and benchmarking, FTE is generally the more meaningful metric.
When to use which metric:
FTE in Practice – Use Cases in HR
Workforce Planning and Budgeting
FTE is the central management metric when companies plan their staffing needs or approve budgets for new positions. Rather than thinking in "heads", HR managers and controllers think in terms of capacity. This makes communication clear: "We need 2.5 FTE in customer service" – which could mean one full-time and one part-time employee, or other combinations.
FTE is equally useful when planning cover for parental leave, annual leave, or sick leave, as it makes visible exactly how much capacity needs to be secured.
Benchmarking and Reporting
Many companies use FTE in regular reporting to senior management or supervisory boards. It enables comparison over time ("How has our capacity developed?") and across departments or locations. Since FTE is internationally standardised, it is also well suited for comparisons within multinational corporations.
When making industry comparisons, it is worth noting that the underlying full-time hours base may vary – a full-time position in the steel industry (35 h/week) differs from one in retail (40 h/week).
Legal and Statistical Relevance
In Germany, the Commercial Code (HGB § 267 para. 5) requires companies to disclose the average number of employees when classifying themselves into size categories (small, medium, large). FTE is frequently used as the measurement basis here, even though the statutory text does not explicitly use the term.
Statistical authorities such as Germany's Federal Statistical Office (Destatis) and the OECD use FTE in employment statistics to make the labour input comparable across industries and regions.
Frequently Asked Questions about Full-Time Equivalent
What is a Full-Time Equivalent (FTE)?
A Full-Time Equivalent is a metric indicating how many full-time positions the total working hours of all employees correspond to – regardless of whether individual employees work full-time or part-time. It allows for a uniform representation and comparison of workforces with different working time structures.
How do you calculate the Full-Time Equivalent?
The formula is: weekly working hours of the employee ÷ standard full-time weekly hours. Three employees each working 20 hours against a 40-hour full-time baseline result in a combined FTE of 1.5. The reference point is always the collectively agreed or company-defined full-time working week.
What is the difference between headcount and FTE?
Headcount counts all individuals regardless of their working hours. FTE weights by actual working time. Ten employees, five of whom work half-time, give a headcount of 10 but an FTE of 7.5. For capacity planning and benchmarking, FTE is the more precise metric.
How do you calculate the FTE for a mini-job?
A mini-job with 10 hours per week results in an FTE of 0.25 against a full-time base of 40 hours. The contractually agreed weekly hours in the employment contract are always the determining factor – not the minimum wage rate or monthly earnings.
How is parental leave treated in FTE calculations?
Employees on full parental leave with no working obligation are generally not included in the active FTE count. If they are working part-time during parental leave, their part-time portion is factored in pro-rata. Depending on the reporting purpose – for example, for official statistics or financial statements – different rules may apply.
What is FTE used for in HR?
FTE is used for workforce planning and budgeting, headcount reporting to senior management and supervisory boards, benchmarking against industry peers, reporting to statistical authorities, and as the basis for classifying companies into size categories under applicable commercial law.
Is FTE the same as VZÄ?
Yes. VZÄ (Vollzeitäquivalent) is the German-language term for Full-Time Equivalent. The calculation and logic are identical. In international corporations and EU reporting, FTE is the standard term; in German companies and official statistics, VZÄ is commonly used.
Conclusion
The Full-Time Equivalent is a straightforward yet powerful metric for any HR department working with diverse working time models. It makes workforces comparable, simplifies budget planning, and provides the foundation for sound HR controlling. The basic formula – an employee's working hours divided by full-time hours – can be quickly applied to all employment types, from full-time staff to mini-jobbers.
The distinction from headcount is important: using FTE and headcount interchangeably in reports and presentations, without explanation, risks misunderstandings in workforce management.
Once you know how many positions you need to fill, the next question is who to select. The Aivy platform helps HR teams evaluate candidates objectively and fairly – with scientifically validated assessments that reduce unconscious bias and improve the quality of hiring decisions. Learn more about objective talent assessment with Aivy.
Sources
- OECD: Full-time equivalent (FTE) – OECD Glossary of Statistical Terms. https://stats.oecd.org/glossary/detail.asp?ID=1162
- Federal Statistical Office Germany (Destatis): Employment Statistics – Methodological Notes. https://www.destatis.de
- Federal Employment Agency (Bundesagentur für Arbeit): Methodological Report on Employment Statistics. https://statistik.arbeitsagentur.de
- Deutsche Gesellschaft für Personalführung (DGFP): HR Key Performance Indicators Guide. https://www.dgfp.de
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