Part-Time Bank Holiday Calculator
Updated November 2026 · Free · No sign-up
Calculate part-time bank holiday entitlement — the pro-rata method: give every part-timer a proportionate ALLOWANCE of bank-holiday hours, so Monday-pattern staff don’t win and Wednesday-pattern staff don’t lose.
Quick answer: Best practice: annual bank-holiday hours × FTE fraction added to the leave pot, with holidays falling on working days DEDUCTED from it. 8 bank holidays × 7.5 hrs = 60 hrs; a 3-day (0.6 FTE) worker gets 36 hours — however their days fall against the calendar.
The Problem This Solves
UK bank holidays cluster on Mondays (6 of 8 in a typical England and Wales year). Without proration: a Mon-Wed part-timer catches nearly all of them as paid days off; a Wed-Fri colleague on identical hours catches almost none. The Part-Time Workers Regulations demand no-less-favourable treatment — the hours-pot method delivers it both directions.
The Method
- Pot: full-time bank-holiday hours × your FTE fraction — e.g. 60 × 0.6 = 36 hours.
- Deduct each bank holiday that falls on your working day (you’re off anyway) at that day’s hours.
- Remainder: extra leave to book (pot exceeds deductions — the Wed-Fri case) or a shortfall to cover from annual leave (the Monday-heavy case).
Worked Examples
Example 1 — Mon-Wed, 22.5 hrs. Pot 36; 6 Monday holidays × 7.5 = 45 deducted → book 9 hours of annual leave to cover the excess days off. Fair, if initially unpopular.
Example 2 — Wed-Fri. Pot 36; 2 falling on working days = 15 → 21 hours extra leave to book — the fairness the method exists for.
Implementation Notes
State the method in contracts/handbooks (it only works communicated upfront); recalculate each January (bank-holiday counts shift with substitutes and one-offs); Scotland/NI calendars differ (9/10 days). Where contracts grant "bank holidays + X days", the pro-rata applies to the WHOLE package — see the main entitlement page for the 5.6-week floor math.
Frequently Asked Questions
How do bank holidays work part-time?
Best practice prorates them as an hours pot (full-time BH hours × FTE), deducting holidays that fall on your working days — so day-pattern luck doesn’t decide your leave.
Why do Monday workers have to give leave back?
Their pattern catches most of the 6+ Monday holidays — more than their FTE share; the pot method deducts the excess from annual leave, mirroring the extra they’d otherwise enjoy.
Is proration legally required?
The Part-Time Workers Regulations require no-less-favourable treatment — the hours-pot method is the accepted way to comply in both directions.
What about Scotland and Northern Ireland?
Different calendars (9 and 10 holidays) — the method is identical with the local count.
Do bank holidays come on top of 5.6 weeks?
No statutory extra — 5.6 weeks (28 days FTE) can INCLUDE bank holidays; contracts saying "25 days + bank holidays" grant more than the floor.
✓ Formula verified • Last updated: November 3, 2026