Free UK & US tool — part-time bank holiday entitlement in seconds
Calculating pro rata bank holiday entitlement for part-time employees is one of the most commonly mishandled tasks in HR — and getting it wrong exposes employers to legal liability. This free pro rata bank holiday calculator works it out instantly for UK and US workers, using the correct hours-based method recommended by employment law advisors.
Enter your employee’s contracted hours, the company’s full-time week, and your region. The calculator returns the exact bank holiday entitlement in hours and equivalent days.
What Is Pro Rata Bank Holiday Entitlement?
“Pro rata” is Latin for “proportionally.” When applied to bank holidays, it means a part-time employee receives a share of bank holidays proportional to the hours they work compared to a full-time equivalent.
In the UK, this is a legal requirement. The Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000 make it unlawful to treat part-time workers less favourably than comparable full-time workers — and that includes bank holiday entitlement.
In the US, there is no federal mandate requiring employers to offer paid bank holidays at all. However, most employers do offer them, and when they do, part-time workers should receive a proportional entitlement under best-practice HR policy and, in some states, under anti-discrimination law.
How to Calculate Pro Rata Bank Holidays
The most reliable method — used by ACAS, the UK government, and most HR professionals — is to calculate bank holiday entitlement in hours rather than days. Calculating in days creates ambiguity when a bank holiday falls on a non-working day for the employee.
The Formula
Pro Rata Bank Holiday Entitlement (hours) = (Contracted Hours ÷ Full-Time Hours) × (Number of Bank Holidays × Full-Time Hours Per Day)
Step-by-Step Worked Example (UK)
Employee details:
- Contracted hours: 22.5 hours per week (3 days)
- Company full-time week: 37.5 hours (5 days)
- Bank holidays: 8 (England and Wales)
- Full-time hours per day: 37.5 ÷ 5 = 7.5 hours
Calculation:
| Step | Calculation | Result |
|---|---|---|
| Pro rata fraction | 22.5 ÷ 37.5 | 0.6 (60%) |
| Full-time bank holiday hours | 8 × 7.5 | 60 hours |
| Pro rata entitlement | 0.6 × 60 | 36 hours |
| Equivalent days (at 4.5 hrs/day) | 36 ÷ 4.5 | 8 days |
This employee is entitled to 36 hours of bank holiday leave, equivalent to 8 working days at their daily contracted hours.
Step-by-Step Worked Example (US)
Employee details:
- Contracted hours: 24 hours per week (3 days)
- Company full-time week: 40 hours
- Federal public holidays observed: 11
- Full-time hours per day: 40 ÷ 5 = 8 hours
Calculation:
| Step | Calculation | Result |
|---|---|---|
| Pro rata fraction | 24 ÷ 40 | 0.6 (60%) |
| Full-time holiday hours | 11 × 8 | 88 hours |
| Pro rata entitlement | 0.6 × 88 | 52.8 hours |
| Equivalent days (at 8 hrs/day) | 52.8 ÷ 8 | 6.6 days |
UK Bank Holidays by Region (2025–2026)
The number of bank holidays in the UK varies by nation. Always use the figure for the region where your employee works.
| Region | Bank Holidays Per Year | Key Differences |
|---|---|---|
| England & Wales | 8 | Standard |
| Scotland | 9 | Includes 2 Jan & St Andrew’s Day (30 Nov) |
| Northern Ireland | 10 | Includes St Patrick’s Day (17 Mar) & Battle of the Boyne (12 Jul) |
Always verify the current year’s bank holidays at gov.uk/bank-holidays, as occasional extra days are added (e.g. coronations, jubilees).
US Federal Public Holidays 2026
The US has 11 federal public holidays in 2026. Note that private employers are not legally required to grant these as paid days off — that is determined by individual employment contracts and company policy.
| Holiday | 2026 Date |
|---|---|
| New Year’s Day | 1 January |
| Martin Luther King Jr. Day | 19 January |
| Presidents’ Day | 16 February |
| Memorial Day | 25 May |
| Juneteenth | 19 June |
| Independence Day | 4 July |
| Labor Day | 7 September |
| Columbus Day | 12 October |
| Veterans Day | 11 November |
| Thanksgiving Day | 26 November |
| Christmas Day | 25 December |
For US federal employees, public holiday entitlement is governed by OPM.gov.
Common Part-Time Bank Holiday Entitlements (UK Reference Table)
Based on a 37.5-hour full-time week and 8 bank holidays (England & Wales):
| Days/Week | Hours/Week | Pro Rata % | Bank Holiday Hours | Equivalent Days* |
|---|---|---|---|---|
| 5 (full-time) | 37.5 | 100% | 60 hrs | 8 days |
| 4 | 30 | 80% | 48 hrs | 6.4 days |
| 3 | 22.5 | 60% | 36 hrs | 4.8 days |
| 2 | 15 | 40% | 24 hrs | 3.2 days |
| 1 | 7.5 | 20% | 12 hrs | 1.6 days |
*Based on 7.5-hour working day. Adjust if hours per day differ.
Why Calculate in Hours, Not Days?
Most HR disputes over bank holiday entitlement arise when employers calculate in days and a bank holiday falls on a non-working day for the part-time employee.
Example: A part-time employee works Monday to Wednesday only. Every UK bank holiday in England falls on a Monday. If entitlement is calculated in days and the employer just gives the Monday off, the employee effectively receives their full entitlement — but an employee who works Tuesday–Thursday receives nothing.
Calculating in hours solves this entirely. The employee receives a bank of hours they can use on any agreed working day. This is the approach recommended by ACAS and the UK government’s holiday entitlement guidance.
Bank Holidays and the 28-Day Statutory Entitlement (UK)
Under the Working Time Regulations 1998, the statutory minimum holiday entitlement in the UK is 5.6 weeks (28 days for a full-time 5-day-week worker). Employers can include bank holidays within this 28-day figure, or offer them on top — this is at their discretion and should be stated clearly in the employment contract.
Impact on pro rata calculations
If bank holidays are included within the 28-day entitlement:
- Total leave entitlement = 5.6 × contracted days/week
- Bank holidays are taken from within this total
- No separate bank holiday calculation needed
If bank holidays are on top of the standard entitlement:
- Use our pro rata bank holiday calculator to calculate the separate bank holiday portion
- Add this to the pro rata annual leave entitlement
Use our Pro Rata Holiday Hours Calculator for the full annual leave calculation.
What Happens When a Bank Holiday Falls on a Non-Working Day?
This is the most frequently asked question HR teams receive about part-time bank holidays. The short answer: the employee does not automatically get a day off in lieu — unless the employment contract specifically provides for this.
However, if bank holidays are included within the statutory 28-day entitlement, and the employee cannot take the bank holiday because they don’t work that day, the employer should still ensure the employee receives their full proportional entitlement in another form.
The safest approach, supported by employment tribunal case law, is to calculate all entitlement in hours and allow it to be taken flexibly.
NHS and Public Sector Bank Holiday Calculations
For NHS employees and other public sector workers, the same pro rata principle applies. However, NHS contracts often follow Agenda for Change (AfC) terms, which may have specific provisions for bank holiday pay — including enhanced rates for working on bank holidays.
For NHS staff on part-time AfC contracts, bank holiday entitlement is typically calculated as a proportion of the 8 general public holidays per year, allocated in hours.
NHS Example:
- Full-time hours: 37.5/week
- Employee hours: 30/week
- Pro rata fraction: 30 ÷ 37.5 = 80%
- Bank holiday entitlement: 80% × 60 hours = 48 hours
Zero-Hours Contract Workers
Zero-hours contract workers accrue holiday entitlement based on hours actually worked. For bank holiday purposes, use the 52-week average of hours worked (excluding weeks not worked) as the contracted hours figure, then apply the standard pro rata formula.
For irregular hours workers, our Pro Rata Holiday Calculator for Leavers can help calculate entitlement mid-year.
Related Calculators
- Pro Rata Holiday Hours Calculator — Full annual leave entitlement
- Pro Rata Salary Calculator — Part-time salary calculation
- Pro Rata Sick Leave Calculator — Sick pay entitlement
- Pro Rata Holiday Calculator for Leavers — Mid-year leavers
- Pro Rata Days Calculator — Days-based calculations
- Pro Rata Term Time Salary Calculator — School staff
Frequently Asked Questions
Do part-time workers have a legal right to bank holidays in the UK?
Yes. The Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000 require that part-time workers receive no less favourable treatment than comparable full-time workers. This explicitly includes holiday entitlement, meaning part-time employees must receive a pro rata share of bank holidays.
Do part-time workers get bank holidays in the US?
There is no US federal law requiring private employers to give employees paid bank holidays — full-time or part-time. However, most employers do offer them voluntarily. Where they are offered, best practice (and in some states, anti-discrimination law) requires part-time workers to receive a proportional entitlement.
What is the formula for calculating pro rata bank holidays?
The formula is: (Employee’s weekly contracted hours ÷ Full-time weekly hours) × (Number of bank holidays × Full-time daily hours). This gives the entitlement in hours. Divide by the employee’s daily hours to convert to days.
Should I calculate bank holiday entitlement in hours or days?
Hours is strongly preferred by HR professionals and is consistent with guidance from ACAS and the UK government. Calculating in days creates problems when bank holidays fall on non-working days — calculating in hours avoids this entirely.
How many bank holidays are there in England and Wales in 2026?
There are 8 bank holidays in England and Wales in a standard year. Scotland has 9, and Northern Ireland has 10. Occasional extra bank holidays may be added for special national events.
What if a bank holiday falls on a day my employee doesn’t work?
The employee does not automatically get a day in lieu, unless the contract states otherwise. If bank holiday entitlement is calculated in hours, the employee simply uses those hours on any agreed working day instead.
How do I calculate bank holiday entitlement for someone joining mid-year?
Calculate the number of bank holidays remaining in the leave year from the employee’s start date, then apply the pro rata fraction to those remaining bank holidays only. Use our Pro Rata Holiday Calculator for Leavers for this.
Can employers include bank holidays within the 28-day statutory minimum?
Yes. The statutory 28 days (5.6 weeks) can include bank holidays — this is entirely at the employer’s discretion and must be clearly stated in the employment contract. Many employers offer bank holidays on top of the 28-day minimum.
How are bank holidays calculated for NHS staff?
NHS staff on Agenda for Change contracts receive bank holiday entitlement calculated on a pro rata basis using the same formula: (contracted hours ÷ 37.5) × 8 bank holidays × 7.5 hours. Enhanced rates may apply for working on the actual bank holiday day.
Does the pro rata bank holiday rule apply to agency workers?
Yes, after 12 weeks in the same role with the same hirer. Under the Agency Workers Regulations 2010, agency workers who have completed a 12-week qualifying period are entitled to the same basic working and employment conditions as comparable permanent workers, including pro rata holiday entitlement.