Full-time Equivalent (FTE) Calculator

Convert a mixed full-time and part-time headcount into total Full-Time Equivalent (FTE) staff, using FTE = full-time headcount + (part-time headcount × average part-time hours ÷ standard full-time hours).

Quick Facts

Formula
FTE = Full-time + (Part-time × Avg hours ÷ Standard hours)
Each part-time worker counts as a fraction of one full-time slot based on hours worked.
Common benchmark
40 hours/week ≈ 2,080 hours/year
Some employers use 37.5 or 35 hours/week instead; the ACA defines full-time as 30+ hours/week for employer-mandate purposes.

Your Results

Calculated
Total FTE
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Full-time headcount + part-time FTE
Part-time FTE
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Part-time hours converted to full-time units
Total headcount
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Full-time + part-time employees (unadjusted)
FTE ratio
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Total FTE ÷ total headcount

Ready

Enter full-time and part-time headcount, average part-time hours, and your standard full-time week, then press Calculate.

How the Full-Time Equivalent (FTE) Calculator works

FTE (Full-Time Equivalent) is a standard workforce metric that converts a headcount mixing full-time and part-time employees into a single number expressed in full-time units. It answers the question: "how many full-time positions is this workforce actually equivalent to?" HR and finance teams use it for labor budgeting, staffing ratios, grant reporting, and regulatory thresholds such as the Affordable Care Act's employer mandate.

The formula

For a full-time headcount F, a part-time headcount P, the average weekly hours worked by part-time staff H, and the standard full-time weekly hours S (commonly 40), total FTE is:

FTE = F + (P × H ÷ S)

Each part-time employee is converted into a fraction of one full-time slot based on how many hours they work relative to a full-time schedule. A part-time worker averaging 20 hours a week against a 40-hour standard counts as 0.5 FTE; one averaging 10 hours counts as 0.25 FTE. Full-time employees always count as exactly 1.0 FTE each.

Worked example

Take 25 full-time employees and 10 part-time employees averaging 20 hours a week, against a 40-hour standard full-time week. The part-time FTE is (10 × 20) ÷ 40 = 5.0 FTE. Total FTE is 25 + 5.0 = 30.0 FTE, even though the raw headcount is 35 people. The FTE ratio — total FTE divided by total headcount — is 30.0 ÷ 35 ≈ 85.7%, showing the workforce runs slightly below a fully full-time schedule on average.

Choosing a standard full-time week

  • 40 hours/week is the most common US benchmark, equal to about 2,080 hours per year before accounting for holidays or leave.
  • 37.5 hours/week is common where a paid lunch break is excluded from the scheduled week.
  • 30 hours/week is the threshold the Affordable Care Act uses to define "full-time" for the employer shared-responsibility mandate — a different definition from an internal HR full-time policy, so check which one your calculation needs before comparing to a regulatory limit.

Whichever standard you choose, apply it consistently to every part-time employee in the calculation — switching definitions mid-calculation is the most common source of FTE errors.

What moves the total most

Full-time headcount contributes one-for-one to total FTE, so it dominates when the workforce is mostly full-time. Part-time FTE is most sensitive to average part-time hours: doubling average part-time hours doubles the part-time FTE contribution, while doubling part-time headcount at the same average hours also doubles it. The standard full-time hours figure acts as the denominator — raising it (say from 35 to 40 hours) lowers every part-time employee's FTE contribution, so changing that benchmark alone can shift the total without anyone's actual schedule changing.

Frequently Asked Questions

How is Full-Time Equivalent (FTE) calculated?
FTE = full-time headcount + (part-time headcount × average part-time weekly hours ÷ standard full-time weekly hours). Each part-time worker is converted into a fraction of a full-time slot based on how many hours they work compared to a standard full-time schedule (commonly 40 hours per week), then added to the full-time headcount.
What is a standard full-time work week for FTE purposes?
Most US employers use 40 hours per week (about 2,080 hours per year) as the full-time benchmark, though some organizations use 37.5 or 35 hours per week. The Affordable Care Act defines full-time as 30+ hours per week for employer mandate purposes. Whichever figure you use, apply it consistently across the calculation.
Why does FTE matter for staffing and budgeting?
Headcount alone can be misleading because it treats a 10-hour-per-week worker the same as a 40-hour-per-week worker. FTE normalizes everyone to full-time units, which makes labor budgets, productivity ratios, and regulatory thresholds (such as ACA employer mandate rules) comparable across a workforce with mixed schedules.
Does a higher FTE ratio mean the workforce is more efficient?
The FTE ratio (total FTE divided by total headcount) shows how close the average employee is to a full-time schedule, not efficiency or output. A ratio near 100% means most staff work close to full-time hours; a lower ratio means the organization relies more heavily on part-time schedules, which affects benefits eligibility and coverage planning rather than productivity.

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