By Intious · Updated September 15, 2026
Open the calculator and export your results.
Start with the decision you need to make
A manager considering a shorter workweek needs to know more than the new headcount. If the same employees remain on the roster, headcount cannot describe the capacity change. Compare each group’s scheduled hours before and after the proposal, using one consistent weekly full-time baseline.
A change that hides inside an unchanged total
Six employees working 40 hours provide 240 hours. Four employees working 24 hours provide another 96. Total capacity is 336 weekly hours and 8.4 FTE at a 40-hour baseline. Moving the first group to 36 hours reduces its capacity to 216. Moving the second group to 30 hours raises its capacity to 120. The total is still 336 hours.
That unchanged total can hide a real coverage problem. The first group might handle a specialist process that the second group cannot cover. The right follow-up is to compare skills and shift availability, not declare the proposal neutral because the FTE number is unchanged.
Keep the baseline fixed
If full time means 37.5 hours, divide both totals by 37.5. Changing the denominator halfway through makes the comparison misleading. A 30-hour schedule represents 0.8 FTE at 37.5 hours but 0.75 FTE at 40 hours. Neither is universally correct; the baseline must match the purpose of your report.
Review the result before approving a roster
- Check that each person belongs to one group only.
- Use weekly figures in both scenarios.
- Identify hours tied to a skill, location or time of day.
- Review break cover and absence separately.
- Record the effective dates and full-time baseline beside the result.
The shift coverage calculator helps check time-specific gaps. The productive-hours guide explains why scheduled capacity exceeds usable capacity.
Use the right FTE definition
This is operational schedule arithmetic. Statutory measures can use a different method; for example, the IRS applicable-large-employer calculation has its own employee-hour rules. Do not use this schedule comparison as a substitute for that calculation.
Frequently asked questions
Does a shorter schedule change headcount?
No. In this comparison the same people appear in both scenarios. Their combined hours and FTE change, while headcount stays constant.
Can the full-time baseline be 37.5 hours?
Yes. Set the baseline to your organization’s weekly full-time hours and use it consistently for both scenarios.
Does this calculate salary or legal employment status?
No. It compares scheduled capacity. Pay, benefits and statutory FTE measures can use different rules.
Can a group have zero proposed hours?
Yes. Zero models no scheduled capacity from that group. The people remain in this scenario’s headcount; use a separate roster model for departures.