Headcount counts bodies; FTE counts workload. Enter your full-time and part-time staff — the calculator converts everyone to full-time equivalents, with the IRS 120-hour monthly method and your distance from the 50-FTE employer line.
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Your full-time equivalent
Count employees on payroll — full-time means 30+ hours a week for the IRS test; your company’s own benchmark sets the standard-method divisor. 1099 contractors don’t count toward FTE.
How it works: the standard method adds up everyone’s weekly hours and divides by your full-time benchmark: (FT × benchmark + PT × avg hours) ÷ benchmark. The IRS monthly method — the one behind the 50-FTE employer test — instead adds your full-time headcount to (total part-time monthly hours ÷ 120). Nothing you type leaves your device.
What FTE actually measures
FTE converts a mixed workforce into one number: how many full-time people is this workload equivalent to? One full-timer is 1.0 FTE; two half-timers are also 1.0 FTE. Headcount counts bodies — FTE counts workload — and budgets, benefits eligibility, and the ACA employer mandate all run on FTE, not headcount.
Output · formula · meaning
Output
Formula
What it means
Standard FTE
(FT × benchmark + PT × avg hrs) ÷ benchmark
The headline number: your whole staff expressed as full-timers. Two half-timers equal one FTE.
Headcount
FT + PT
Bodies on payroll — always equal to or higher than FTE. The gap between the two is your part-time share.
IRS monthly FTE
FT + (PT monthly hours ÷ 120)
The legal figure behind the 50-FTE employer test. Monthly hours = weekly hours × 52 ÷ 12.
Room to the 50-FTE line
50 − IRS monthly FTE
How much FTE you can add before ACA Applicable Large Employer duties kick in.
Worked example: the 16.0-FTE bakery
Bright Side Bakery has 12 full-timers and 8 part-timers averaging 20 hours a week, on a 40-hour benchmark. Standard method: (12 × 40 + 8 × 20) ÷ 40 = 640 ÷ 40 = 16.00 FTE — even though headcount is 20. IRS monthly method: part-time monthly hours = 8 × 20 × 52 ÷ 12 = 693.3; 693.3 ÷ 120 = 5.78; plus 12 full-timers = 17.78 FTE — 32.22 under the 50-FTE line.
Who uses this
HR managers: turning staffing plans into budgets — finance plans in FTE, not bodies.
Small business owners: watching the 50-FTE line where ACA employer-shared-responsibility duties begin.
Grant writers & nonprofits: grant applications and annual reports almost always ask for staff FTE.
Clinic & school admins: staffing ratios (nurses per patient, teachers per student) are set in FTE.
Accuracy & limitations
The standard method is a convention, not a law — your company’s definition of full-time (32 vs 40 hours) changes the number, so state your benchmark when you report FTE. The IRS 120-hour monthly divisor applies specifically to the Applicable Large Employer test (employers averaging 50+ full-time equivalents, where full-time means 30+ hours a week); seasonal and part-year workers have special counting rules. This page does arithmetic, not legal advice — confirm employer-mandate questions with your benefits counsel.
Cite this pageBright Side Kit. “Full-Time Equivalent (FTE) Calculator.” brightoolbox.com, 2026.Bright Side Kit. "Full-Time Equivalent (FTE) Calculator." https://brightoolbox.com/full-time-equivalent-calculator/ Accessed October 21, 2026.
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Frequently asked questions
What is 1.0 FTE?
One full-time employee’s workload for the period — typically 40 hours a week. Two employees each working 20 hours a week also equal 1.0 FTE. It’s a measure of work, not of people.
How do you calculate FTE for part-time employees?
Add up all their weekly hours and divide by your full-time benchmark: (number of part-timers × their average weekly hours) ÷ benchmark. Eight part-timers at 20 hours a week on a 40-hour benchmark = 160 ÷ 40 = 4.0 FTE.
What is the IRS 120-hour rule?
For the ACA’s Applicable Large Employer test, the IRS converts part-time hours to FTE with a fixed monthly divisor: add up every part-timer’s hours for the month and divide by 120, then add your full-time headcount. Hit an average of 50 and the employer mandate applies.
Is 40 hours always 1.0 FTE?
No — 1.0 FTE is whatever your organization defines as full-time. A company with a 37.5-hour week has 1.0 FTE at 37.5 hours; a four-day-week company at 32. That’s why the calculator asks for your benchmark: the same staff is 16.0 FTE on a 40-hour week but 20.0 FTE on a 32-hour week.
What’s the difference between headcount and FTE?
Headcount counts people; FTE counts workload. Twenty employees can be 16.0 FTE if eight of them are half-time. Budgets, benefits eligibility, and the 50-FTE employer line all use FTE — headcount alone overstates how much labor you actually have.
Do contractors or owners count toward FTE?
Generally no. FTE counts employees on payroll. 1099 contractors, temps hired through an agency, and business owners are excluded from the ACA’s FTE count — which is one reason the 1099 vs W-2 choice changes more than taxes.