How to calculate pro rata annual leave
Pro rata annual leave means holiday entitlement is adjusted based on how much of a full-time schedule someone works, and sometimes how much of the leave year they are employed. This is common for part-time employees, new starters, and people leaving before the end of the holiday year.
A simple way to think about it: start with the full-time allowance, apply the part-time working pattern, then apply time worked in the leave year.
Core formula
In day-based systems, a typical formula is:
- Step 1: Full-time entitlement × (employee days per week ÷ full-time days per week)
- Step 2: Result × fraction of leave year worked
- Step 3: Apply your company’s rounding rule
This calculator performs each step and shows the full breakdown so you can quickly verify payroll or HR calculations.
When a pro rata annual leave calculator is useful
- Part-time work schedules (for example 2, 3, or 4 days per week)
- Mid-year starters joining after the leave year began
- Leavers finishing before the leave year ends
- Contract changes from full-time to part-time (or vice versa)
- Checking leave balance after holiday taken
Worked examples
Example 1: Part-time employee for full leave year
Suppose full-time staff receive 28 days and work 5 days per week. A part-time employee works 3 days per week for the full leave year.
- Pattern ratio: 3 ÷ 5 = 0.6
- Pro rata entitlement: 28 × 0.6 = 16.8 days
- If rounding to nearest half day: 17.0 days
Example 2: Mid-year starter
Same settings as above, but the employee only works 6 months of the leave year:
- Base part-time entitlement: 16.8 days
- Year fraction: 6 ÷ 12 = 0.5
- Accrued entitlement: 16.8 × 0.5 = 8.4 days
- Rounded (nearest half): 8.5 days
Important details that affect leave calculations
1) Rounding policy
Two companies can calculate the same raw entitlement but produce different final numbers because of rounding. Some round to the nearest half day, others always round up, and some keep decimals exactly. Always check your policy handbook.
2) Bank holidays and public holidays
Organizations handle bank holidays differently. Some include bank holidays within the annual entitlement; others provide them separately. If your employer includes bank holidays in the total allowance, your available discretionary holiday may be lower.
3) Hours vs days
Many businesses track leave in hours, especially where shift lengths vary. In those cases, convert the day-based result into hours using your standard daily hours. For example, 16.8 days × 7.5 hours = 126 hours.
4) Carry-over and negative balances
If you have taken more leave than accrued by the time you leave, your final salary may be adjusted depending on contract terms and local law. Likewise, unused entitlement may carry over under certain conditions.
Quick checklist for accurate pro rata leave
- Confirm full-time entitlement in days (or hours)
- Confirm full-time and personal weekly working pattern
- Use exact employment dates where possible
- Apply the agreed rounding rule consistently
- Subtract leave already taken to get a real balance
FAQ
Is pro rata leave only for part-time workers?
No. Full-time workers can also receive pro rata leave when they join or leave partway through a leave year.
Should I calculate in calendar days or working days?
Most employers calculate holiday in working days or hours. Calendar-day methods are less common for salaried office roles. Follow your employment contract and internal policy.
Can this calculator replace HR advice?
It’s designed as a practical estimator and checker. For legal interpretation, contract disputes, or jurisdiction-specific requirements, consult your HR team or a qualified employment professional.
If you use this tool regularly, save this page so you can quickly check annual leave entitlement, accrued holiday, and remaining balance anytime your schedule changes.