Axiom answer · Reviewed August 15, 2026
How Do You Calculate Intermittent FMLA Leave?
Short answer: Calculate intermittent FMLA leave from the employee's actual workweek. Divide the FMLA hours taken by the hours the employee would otherwise have worked that week. Track leave in the shortest increment used for any other leave, capped at one hour. Variable schedules may require a 12-month weekly average, while holidays, overtime, and physical-impossibility situations need separate treatment.
Reviewed by Andy Zelt
When I review an intermittent-leave workflow, I start with the schedule the employee would actually have worked. That one fact controls the fraction of a workweek used and prevents a surprising number of balance errors.
The examples below explain the federal FMLA calculation. State or local leave laws, collective bargaining agreements, employer policies, and individual facts can require a separate analysis.
What is the basic intermittent FMLA calculation?
For leave taken in periods shorter than a full workweek, calculate the amount used as a proportion of the employee's actual workweek:
FMLA hours taken ÷ hours the employee would otherwise have worked = portion of one FMLA workweek used.
An employee normally scheduled for 40 hours who takes eight FMLA hours uses one-fifth of a workweek. An employee normally scheduled for 30 hours who takes 10 FMLA hours uses one-third of a workweek. There is no universal 480-hour entitlement because the hourly equivalent depends on the employee's normal schedule. The U.S. Department of Labor explains these calculations in Fact Sheet #28I.
| Situation | Federal calculation | Result to verify |
|---|---|---|
| 40-hour schedule; 8 hours absent | 8 ÷ 40 | 1/5 workweek |
| 30-hour schedule; 10 hours absent | 10 ÷ 30 | 1/3 workweek |
| Required overtime is missed | Include the missed required hours in the calculation | May count as FMLA |
| Voluntary overtime is missed | Do not deduct voluntary hours the employee was not required to work | Does not count |
| Holiday falls in a full FMLA week | Count the whole week when the employee is on FMLA for the entire week | Whole week counts |
| Holiday falls in a partial FMLA week | Count only leave for time the employee otherwise would have worked | Check the schedule |
What tracking increment should an employer use?
An employer generally must account for intermittent FMLA leave using an increment no greater than the shortest period it uses to account for other forms of leave, provided that the increment is no longer than one hour. The rule follows the employer's actual leave-accounting practice, not merely the smallest increment a system can support.
Except for the narrow physical-impossibility rule, an employer may not deduct more FMLA leave than the employee actually takes. Review 29 CFR 825.205 and the Department of Labor's current calculation guidance before configuring increments or rounding rules.
How do variable schedules, holidays, and overtime change the calculation?
Variable schedules: If the hours the employee would otherwise have worked cannot be determined, use the weekly average of hours scheduled during the 12 months immediately before the leave begins. Include hours for which the employee took any type of leave. If the employee has worked fewer than 12 months, use the entire period worked.
Overtime: Overtime the employee would have been required to work may count against FMLA entitlement when missed for an FMLA-qualifying reason. Voluntary overtime the employee could have chosen but was not required to work does not.
Holidays and shutdowns: A holiday within a full week of FMLA leave does not reduce the amount counted; the full week is used. During a partial week, the holiday generally counts only if the employee was scheduled and expected to work and used FMLA leave for that time. A full week when the employer is closed and no employee is expected to work generally does not count.
When does the physical-impossibility exception apply?
The exception is narrow. If the nature of the job makes it physically impossible for the employee to begin or end work partway through a shift, the employer may count the period the employee is forced to miss. The employee must be allowed to resume work as soon as the physical impossibility ends. Employers should document the operational fact instead of treating inconvenience, scheduling preference, or administrative difficulty as impossibility.
Software helps when it keeps the case, schedule, time entry, and balance connected. The April 2026 UKG Ready Leave Manager product profile lists real-time continuous and intermittent leave tracking, timesheet and schedule integration, historical timesheet changes, retro pay, and reporting. Those capabilities support the record; they do not make the employer's legal or factual decisions.
What should HR verify before deducting intermittent FMLA leave?
- Actual schedule: Confirm the hours and shifts the employee would otherwise have worked during the affected week.
- Required overtime: Separate overtime the employee was required to work from voluntary opportunities.
- Tracking increment: Match the shortest increment actually used for another form of leave, subject to the one-hour cap.
- Certification limits: Compare the absence with the certified frequency, duration, and qualifying reason; escalate inconsistencies for qualified review.
- Holiday or shutdown: Determine whether the employee was scheduled and expected to work and whether the leave covered a full or partial week.
- Variable-schedule lookback: Document the 12-month weekly average, or the entire period worked if shorter, when the normal schedule cannot be determined.
- Time and payroll reconciliation: Make sure the approved leave, timecard, pay result, and remaining entitlement agree after corrections.
Related questions
How many hours is 12 weeks of FMLA leave?
There is no universal 480-hour answer. For an employee who normally works 40 hours each week, 12 workweeks is commonly equivalent to 480 hours. An employee with a different normal schedule has a different hourly equivalent, and variable schedules may require a 12-month weekly average.
Can an employer round intermittent FMLA leave to one hour?
Only when one hour is no greater than the shortest increment the employer actually uses to account for another form of leave. The increment can never exceed one hour, and the employer generally may not deduct more time than the employee actually takes.
How do holidays count during intermittent FMLA leave?
If an employee uses FMLA for a full workweek, a holiday inside that week does not change the full-week deduction. If the employee uses only part of the week, the holiday generally counts only when the employee was scheduled and expected to work and used FMLA leave for that time.
Sources and limitations
U.S. Department of Labor Fact Sheet #28I, revised March 2025; 29 CFR 825.205, reviewed August 15, 2026; UKG Ready Leave Manager Product Profile, CV2197-USv6, April 2026. Federal overview only; confirm current federal, state, and local requirements and obtain qualified legal review before relying on this answer. Reviewed August 15, 2026. Confirm jurisdiction, product configuration, and effective dates before acting.
Want to test your intermittent-leave calculation workflow?
Axiom can help you map how approved leave, schedules, timesheets, balance calculations, and human review should connect in UKG Ready.