FTE expresses capacity relative to a full-time baseline. Headcount counts people. Part-time schedules make the two numbers differ.
A mixed-team example
Eight people at forty hours and four people at twenty hours provide 400 scheduled hours. With a forty-hour baseline, that is ten FTE across twelve people. Calculate FTE from hours before discussing availability.
From a requirement to hiring
A requirement of 12.5 FTE can be supplied by twelve full-time employees and one half-time employee, or another mix. The calculator rounds up to thirteen only under its stated assumption of full-time people.
Coverage still matters
Enough total weekly hours does not guarantee enough people on Tuesday at 9 AM. A workload-based FTE estimate is a capacity calculation, not an interval-level roster or queueing model.
Try it with your numbers
Convert workload hours into productive and scheduled full-time equivalents.
For example, six people at 40 hours and four at 20 hours supply 320 hours. On a 40-hour baseline that equals 8 FTE, with headcount of 10.
Should every team use a 40-hour baseline?
No. Use the relevant full-time schedule consistently. A 35-hour baseline and a 40-hour baseline measure capacity differently.
Can a headcount increase leave FTE unchanged?
Yes. Replacing one full-time assignment with two half-time assignments increases headcount from one to two while retaining one FTE under the same baseline.
Roster size, access, equipment and manager workload
FTE
Hours relative to one full-time schedule
Capacity, budgets and comparisons across mixed schedules
A person always adds one to headcount, but may contribute less than 1.0 FTE. That is why twelve people can represent ten FTE without any arithmetic error.
How to calculate FTE versus headcount
Add the scheduled hours for everyone in the same period, then divide by the full-time baseline for that period. The formula is FTE = total scheduled hours ÷ full-time hours. Headcount is simply the number of distinct people. For six people at 40 hours and four people at 20 hours, headcount is 10 while FTE is (240 + 80) ÷ 40 = 8.0.
If full time is 37.5 hours, use 37.5 rather than 40. A person working 30 hours is 0.8 FTE on a 37.5-hour baseline but 0.75 FTE on a 40-hour baseline. Record the baseline beside every result.
Can FTE be converted directly to headcount?
Not without another assumption. Ten FTE could be ten full-time people, twenty half-time people or many other combinations. If the average scheduled FTE per person is known, estimated headcount equals required FTE divided by that average. Keep the result separate from a hiring decision because availability, skills and shift coverage can still change the number of people required.
Questions people ask about FTE and headcount
What is the difference between FTE and headcount?
Headcount counts people. FTE converts their scheduled hours into units of a full-time schedule. A team can therefore have a headcount of 10 and only 8.0 FTE.
How many hours is 90% FTE?
Multiply the full-time baseline by 0.9. That is 36 hours when full time is 40 hours, 33.75 hours on a 37.5-hour week, or 31.5 hours on a 35-hour week.
What is the formula for calculating headcount?
Actual headcount is the number of distinct people on the roster. To estimate people from an FTE requirement, divide required FTE by the assumed average FTE per person, then round according to the staffing plan.
How many hours is 5% FTE?
Multiply the full-time baseline by 0.05. It is 2 hours on a 40-hour week and 1.875 hours on a 37.5-hour week.
Productive Hours vs Scheduled Hours in Workforce Planning — Scheduled hours show assigned time; productive hours show the portion available for a defined workload. Comparing demand with the wrong measure can hide a capacity gap.