How to Calculate FTE (Full-Time Equivalent)

By Nicole Hullihen, former SaaS Chief Operating Officer and Microsoft MVP · Updated October 11, 2026

Headcount tells you how many people work for you. FTE tells you how much work they represent. A business with 12 employees, half of them part-time, might have the workload of 8 full-time people, and that difference matters for budgeting, staffing, productivity and, for larger employers, health coverage rules.

This guide shows how to calculate FTE, with worked examples, explains the separate IRS method used for the Affordable Care Act and covers common mistakes.

Note: This is general information, not tax or legal advice. ACA rules have details beyond this summary, so confirm your status with your accountant or benefits advisor.

What Is FTE?

FTE stands for full-time equivalent. One FTE equals the hours of one full-time employee. Two half-time employees together equal one FTE. Ten employees working 20 hours a week equal five FTEs.

Why FTE Matters

• Budgeting. Plan labor costs based on the work you actually need. See how to create a labor budget.
• Staffing. See whether you need another full-time hire or more part-time hours.
• Productivity metrics. Revenue per FTE is fairer than revenue per head when you have part-timers.
• Benefits and compliance. Some rules, including the ACA employer requirements, use full-time and FTE counts.
• Grants, loans and reports often ask for FTE counts.

The Basic FTE Formula

Some businesses define full-time as 37.5 or 35 hours. Use whatever your business considers full-time, and be consistent. For ACA purposes, the IRS uses its own definitions, covered below.

Worked Example: Weekly FTE

FTE = 152 ÷ 40 = 3.8 FTE. Five people, but the workload of just under four full-time employees.

Worked Example: Annual FTE

A business had employees work a combined 18,720 hours last year, including all full-time and part-time staff.

FTE = 18,720 ÷ 2,080 = 9.0 FTE.

Whether to include paid time off depends on your purpose. For staffing and workload, many businesses count only hours worked. For budgeting, they often include paid hours. Pick one approach and note it so the numbers are comparable from year to year.

FTE for the Affordable Care Act

The ACA's employer shared responsibility rules apply to applicable large employers (ALEs). According to the IRS, an employer is an ALE for a year if it had an average of at least 50 full-time employees, including full-time equivalent employees, during the prior calendar year.

The IRS method is different from the general formula:

1. Count full-time employees each month. An employee is full-time for a month if they have at least 130 hours of service in that month, or average 30 or more hours of service per week.
2. Calculate FTE employees each month. Add the hours of service of all employees who aren't full-time that month, counting no more than 120 hours for any one employee, and divide by 120.
3. Add the two numbers for each month.
4. Add the 12 monthly totals and divide by 12.
5. If the result is 50 or more, the employer is generally an ALE for the current year.

Example: One Month Under the IRS Method

One month over 50 doesn't decide ALE status; the average across all 12 months of the prior year does. There are additional rules, such as for seasonal workers and related companies, so check with your accountant or benefits advisor if you're close to 50.

For more on how hours thresholds affect part-time employees, see part-time employee minimum hours.

FTE vs. Headcount: When to Use Each

Some laws count employees by headcount, not FTE. For example, the EEOC notes that most employers with at least 15 employees are covered by the federal laws it enforces (20 for age discrimination). Always check which counting method a specific rule uses.

Useful FTE Metrics

Common FTE Mistakes

• Confusing headcount with FTE.
• Using scheduled hours instead of actual hours. Actual time records give a truer picture. See scheduled vs. actual hours.
• Using the general formula for ACA purposes, instead of the IRS method.
• Inconsistent full-time definitions from one report to the next.
• Forgetting seasonal and temporary workers.
• Mixing PTO in some periods and not others.

How to Track FTE Easily

1. Record actual hours for every employee with a reliable time clock.
2. Export hours by period from your time or payroll reports.
3. Use a spreadsheet to sum hours and divide by full-time hours.
4. For ACA, track monthly hours of service for each employee separately.
5. Review monthly so there are no surprises at year-end.

Our free work hours in a year guide shows how to set up the calculations in Excel.

Worked Example: Monthly FTE by Team

The business has 13 people but about 10.8 FTEs of work. Breaking FTE down by team shows where hours are concentrated, which helps when deciding where the next hire should go. If revenue for the month was $162,000, revenue per FTE is about $15,000, a useful number to track over time.

Using FTE to Decide Whether to Hire

FTE is one of the clearest ways to see whether you need another person. Track FTE and overtime together for a few months:

For example, if your part-time staff regularly work a combined 40 extra hours a week, that's a full FTE of work, and a dedicated full-time role may reduce overtime and scheduling headaches. See the overtime approval policy and labor cost percentage.

FTE in Job Descriptions and Budgets

Many businesses describe positions by FTE: a 1.0 FTE role is full-time, a 0.5 FTE role is half-time. Using FTE in job descriptions and budgets makes it easy to see total staffing at a glance and to compare the cost of different options, such as one full-time employee versus two half-time employees. Keep in mind that two half-time employees may cost more or less than one full-time employee, depending on benefits, training time and turnover.

Seasonal and Variable-Hour Employees

Seasonal and variable-hour employees can make FTE tricky, especially for ACA purposes, where special rules may apply. For everyday planning, calculate FTE for each month separately rather than averaging the year, so busy months and slow months are both visible. For ACA purposes, follow the IRS method and ask a benefits advisor about seasonal worker rules if your workforce changes a lot during the year.

FTE Quick Reference

Print this table or keep it in your budget spreadsheet for quick conversions.

Building an FTE Tracker in a Spreadsheet

1. Column A: employee name.
2. Column B: hours worked this period, exported from your time records.
3. Column C: FTE, using a formula like =B2/40 for weekly or =B2/2080 for yearly.
4. Column D: team or location, so you can total FTE by group.
5. Bottom row: total hours and total FTE with =SUM().

For ACA tracking, add a separate monthly tab: one column for each month, with each employee's hours of service. Mark anyone with 130 or more hours as full-time for that month, cap everyone else at 120 hours and divide their combined hours by 120. A spreadsheet handles this well for most small businesses, as long as the hours going in are accurate.

FTE and Productivity Over Time

Tracking FTE alongside revenue, jobs completed or customers served shows whether your team is getting more productive as you grow. If revenue per FTE climbs, you're doing more with the same people. If it falls, hours may be growing faster than results, a sign to look at workflow, training or scheduling before adding more people. Review it quarterly, and compare the same months year over year to account for seasonality.

Common Questions

"Do owners count in FTE?" For internal planning, count anyone whose hours you want to plan around. For specific laws or programs, follow that rule's definition of employee.

"Do contractors count?" Generally, independent contractors aren't employees and aren't counted in employee FTE, but misclassified contractors may be. Track contractor hours separately if you use them for planning.

FTE Checklist

Getting these basics right means your FTE numbers are consistent from one report to the next, which is what makes them useful for decisions.

Explaining FTE to Your Team

Managers sometimes hear "we're adding 0.5 FTE" and aren't sure what it means. Keep it simple: one FTE is one full-time schedule's worth of hours. Adding 0.5 FTE means adding about 20 hours a week of work capacity, which might be one part-time person or extra hours spread across the team. Explaining staffing in FTE helps managers plan schedules and understand why a new hire may be part-time rather than full-time. It also makes budget conversations clearer, because everyone is talking about the same unit of work.

Getting Accurate Hours First

Every FTE calculation is only as accurate as the hours behind it. Use actual punches from a reliable time clock, correct missed punches before you calculate and make sure part-time hours are recorded as carefully as full-time hours. See how to audit timesheets.

Get Accurate Hours for FTE With Updoot

Updoot's employee time clock records every punch to the minute for full-time and part-time staff, and the payroll report shows regular hours, overtime and PTO for each employee every pay period, so the hours behind your FTE calculations are accurate and easy to export.

Sources

• IRS: Determining if an Employer Is an Applicable Large Employer
• EEOC: Overview

Frequently Asked Questions