Full-time equivalent turns a team of part-timers, job sharers, and full-timers into a single comparable number: how many full-time people this workload actually represents. Enter each group of staff and the hours they work, and the calculator returns the FTE alongside the raw headcount.
The two numbers rarely match, and the gap is the point. Ten people working twenty hours each is ten names on a list and five full-time roles of capacity. Budgets, project plans, and productivity ratios all need the second figure.
What FTE actually measures
Full-time equivalent measures labour capacity, not people.
One person on a standard week is 1.0 FTE. Two people at half that week are also 1.0 FTE. Four at a quarter, likewise. The unit is a full-time workload, and everyone contributes a fraction of one depending on how much they work.
The reason the measure exists is that headcount answers the wrong question. If you want to know how many people to send a benefits enrolment to, count heads. If you want to know how much work the team can absorb, what it costs, or how it compares to last year, you need FTE. A company that replaced ten full-timers with twenty half-timers has doubled its headcount and changed nothing about its capacity.
The FTE formula
FTE = Total hours worked ÷ Hours in a full-time week
The first step is summing the hours across every group of staff:
Total hours = Σ (People in group × Hours each)
Both sides of the division have to use the same period. Weekly hours over a weekly standard, or monthly over monthly. Because the units cancel, the answer is the same either way, which is why the calculator asks only for weekly figures.
The standard itself is a decision, not a fact. Forty hours is the common assumption in the United States. Thirty-five and thirty-seven and a half are widespread in Europe. Whichever you use, use it consistently, because changing the denominator changes every FTE figure in the business.
Two worked examples
A mixed team. A company has three people on 40 hours a week and five people on 20 hours a week.
Full-time hours = 3 × 40 = 120
Part-time hours = 5 × 20 = 100
Total hours = 220
FTE = 220 ÷ 40 = 5.5
Eight people, five and a half full-time roles. Any budget built on the headcount of eight is wrong, and any productivity measure built on it is wrong in the other direction.
Adding cost. The same team takes on two more people at 12 hours a week each, and the fully loaded annual cost of a full-time employee is $78,000.
Total hours = 220 + 24 = 244
FTE = 244 ÷ 40 = 6.1
Annual payroll = 6.1 × $78,000 = $475,800
This is where FTE earns its place. Ten people, six full-time roles, and a payroll figure you can put in a plan. Costing from headcount would have overstated it by roughly $300,000.
What FTE is actually used for
Budgeting and forecasting. Payroll planning built on FTE rather than headcount survives contact with a workforce that does not all work the same hours.
Project estimation. A project quoted at 400 hours needs 10 FTE-weeks. Knowing your team is 6.1 FTE rather than 10 people tells you the timeline honestly.
Per-employee metrics. Revenue per employee, output per employee, and cost per employee are all meaningless if the denominator is a headcount that mixes full-time and part-time. Divide by FTE instead.
Regulatory thresholds. Many employment, benefits, and reporting obligations are triggered at FTE counts rather than headcounts, and the two crossing that line at different times is a common compliance surprise.
Comparing periods and teams. A department that shifted from full-time to part-time staff looks like it grew if you count heads. FTE shows what actually happened.
Headcount, FTE, and the gap between them
Measure | What it counts | Best used for |
|---|---|---|
Headcount | Individual people employed | Communications, benefits, culture, org design |
FTE | Full-time workloads | Budgets, capacity, productivity ratios, thresholds |
Contractors and agency | Usually excluded from both | Track separately, then add as FTE for capacity planning |
The third row causes more trouble than the first two. Contract and agency workers do real work and consume real budget, but they typically sit outside both headcount and FTE reporting. A business that quietly replaced permanent staff with contractors will show falling FTE, flat output, and a rising cost line that nobody can attribute. If you are measuring capacity, convert contractors to FTE and include them. If you are measuring employment obligations, do not.
Where FTE misleads
It equates hours with output. Two people at half time do not deliver what one person at full time delivers, because context switching, meetings, and handovers are not proportional to hours. FTE measures input.
It hides the seniority mix. Six FTE of graduates and six FTE of principals are the same number and completely different capabilities. Costing per FTE using an average papers over this.
Overtime distorts it. Someone working 55 hours is not 1.375 FTE in most definitions, because an individual is usually capped at 1.0. Check the rule that applies before you calculate, because different regimes handle this differently.
It says nothing about utilisation. In services businesses, the useful figure is billable FTE, not employed FTE. A consultant at 1.0 FTE and 55% utilisation delivers a little over half a full-time role of revenue.
The standard week is arbitrary. Comparing FTE across countries or across acquisitions, without checking whether both used the same denominator, produces figures that are simply not comparable.
How operators actually use the number
Fix the definition once and write it down. Which hours count, how overtime is treated, whether contractors are included, and what a full-time week is. Every FTE argument traces back to a definition nobody agreed.
Report headcount and FTE together. Neither is sufficient alone, and the gap between them is itself a useful signal about how the workforce is structured.
Use FTE in every per-employee ratio. Revenue per FTE is a real productivity measure. Revenue per head is an artefact of your part-time mix.
Plan capacity in FTE-weeks. A project needing 400 hours is 10 FTE-weeks, and that framing makes the resourcing conversation concrete.
Recalculate when the working pattern shifts. Four-day weeks, compressed hours, and job shares all change FTE without changing a single name on the payroll.
Further reading from Revenue Memo
FAQs
How do I calculate FTE?
Add up the total hours everyone works in a week, then divide by the hours in a full-time week. Three people on 40 hours and five on 20 hours gives 220 total hours, and 220 divided by 40 is 5.5 FTE.
What does 0.5 FTE mean?
It means half a full-time workload. Against a 40-hour standard, that is someone working 20 hours a week. Two such people together count as 1.0 FTE.
How many hours is 1 FTE?
Whatever your organisation defines as a full-time week. Forty hours is the usual assumption in the United States, while 35 to 37.5 is more common across Europe. The number is a convention rather than a rule, so the important thing is applying the same one consistently.
What is the difference between FTE and headcount?
Headcount counts people. FTE counts full-time workloads. A team of ten people all working half time is a headcount of 10 and an FTE of 5. Use headcount for anything about individuals and FTE for anything about capacity or cost.
Do part-time employees count as 1 FTE?
Not usually. A part-time employee counts as the fraction of a full-time week they work, so 20 hours against a 40-hour standard is 0.5 FTE. Some regulatory schemes simplify this by treating every part-timer as 0.5 regardless of actual hours, so check the specific rules that apply to you.
Should contractors be included in FTE?
It depends what you are measuring. For capacity and budget planning, convert their hours to FTE and include them, or you will understate what the business is actually spending and delivering. For employment law and benefits thresholds, they are usually excluded.
How do I calculate cost per FTE?
Divide total fully loaded staff cost by total FTE. Going the other way, multiply your FTE by the average annual cost of a full-time employee. Six point one FTE at $78,000 each is $475,800, which the calculator above works out for you.