Calculate Part-Time Holiday Entitlement (Pro Rata)
Enter your company’s full-time entitlement and your working pattern to estimate your annual leave as a part-time employee.
Formula used: (part-time days ÷ full-time days) × full-time holiday entitlement.
How the part-time holiday calculator works
If you work fewer days than a full-time colleague, your holiday is normally calculated on a pro rata basis. That means you get a fair percentage of the full-time entitlement based on your working pattern.
For example, if full-time staff receive 28 days per year and work 5 days per week, someone working 3 days per week would receive:
- (3 ÷ 5) × 28 = 16.8 days annual leave
This calculator performs that formula instantly and also converts your result into hours if you track leave in hourly units.
Why this matters for part-time workers
Holiday entitlement can feel confusing when shifts vary, when bank holidays are included in annual leave, or when your workplace uses days for some staff and hours for others. A reliable calculation helps you:
- Plan time off more confidently
- Check payslips and HR records for accuracy
- Understand how much flexible leave remains after fixed holidays
- Compare part-time offers fairly
Step-by-step method (manual calculation)
1) Confirm full-time entitlement
Find your company policy for full-time leave. This may be the statutory minimum (often shown as 5.6 weeks) or an enhanced number (for example, 30 days including bank holidays).
2) Compare weekly working days
Use your weekly days versus full-time weekly days. If full-time is 5 days and you work 4, your ratio is 4/5.
3) Multiply by entitlement
Multiply your ratio by the full-time entitlement. This gives your annual leave in days.
4) Convert to hours if needed
If your employer tracks leave in hours, multiply holiday days by your standard hours per day.
Days, hours, and rounding
Different employers round holiday values differently. Common approaches include:
- Rounding to 2 decimal places (e.g., 16.80 days)
- Rounding up to the nearest half day (e.g., 17.0 days)
- Using hours to avoid day-based rounding issues
This tool shows both the exact figure and a rounded-up half-day suggestion, so you can compare methods.
Bank holidays and flexible leave balance
Some companies include bank/public holidays in your annual entitlement. If your employer requires certain holidays to be taken from your allowance, your flexible leave drops accordingly.
That’s why this calculator includes a field for bank holidays used from entitlement, so you can quickly estimate your remaining bookable days.
Example scenarios
Example A: 2.5 days per week
Full-time entitlement = 28 days, full-time week = 5 days, part-time = 2.5 days:
- (2.5 ÷ 5) × 28 = 14.0 days
Example B: 4 days per week with enhanced policy
Full-time entitlement = 33 days, full-time week = 5 days, part-time = 4 days:
- (4 ÷ 5) × 33 = 26.4 days
Practical tips for employees and managers
- Keep calculations in writing and confirm with HR
- Track leave in one unit (days or hours) consistently
- Check whether lunch breaks count toward day-hours conversion
- Review entitlement whenever contracted days change
- Account for carry-over rules at year-end
Final note
A part-time holiday calculation should be transparent, consistent, and easy to audit. Use this tool for quick estimates, then match the output against your contract, handbook, or HR policy for your official entitlement.