How do I calculate my part-time employee’s holiday entitlement?

Managing holiday entitlement shouldn’t be complicated, yet for many UK employers, it’s one of the most confusing (and risky!) areas of payroll and HR compliance. With changing legislation, irregular working patterns, and the rise of part‑time and flexible roles, getting annual leave calculations wrong can cost both time and money.

Is holiday entitlement calculated differently for part-time employees?

No. Every UK worker is legally entitled to 5.6 weeks of paid annual leave, whether they work full‑time or part‑time. The difference? Part‑time staff receive the same 5.6 weeks, just pro‑rated to the hours or days they work.

For example:

• 3 days per week = 16.8 days

30 hours per week = 168 hours

What about bank holidays?

If the contract provision states the employer normally closes on bank holidays, then the part-time employees will use some of their paid leave on the bank holidays that fall on days they would usually be working. If they have a work pattern that means not many bank holidays fall on those days, they will have more leave to book at another time. So bookable leave can vary from year to year for part-time employees, depending on when bank holidays fall, but they still have the same total amount of paid time off.

How do you calculate a part-time employee’s holiday entitlement?

• For example, an employee working 30 hours per week (full-timer works 37.5 hours per week) would be entitled to:
  5.6 x 30 = 168 hours
• For example, an employee works 8 hours per week (full-timer works 37.5 hours per week) would be entitled to:
  5.6 x 8 = 45 hours (rounded up from 44.8 hours)

Why do employers need to keep track of part-time holiday entitlements in hours?

Modern work patterns demand modern tracking methods. Recording holiday entitlement in hours avoids confusion, especially when part‑time employees work:

• Different hours on different days
• Variable shift lengths
• Flexible patterns.

It’s the simplest, most accurate way to ensure entitlement is used fairly and consistently.

What do employers do if they pay staff more than the statutory 5.6 weeks holiday?

Many employers provide enhanced holiday packages. If so, simply calculate the full‑time equivalent and pro‑rate for part‑time hours, ensuring every employee receives their fair share.

For example, a full-time employee is entitled to 32 days (contractually entitled to 24 days plus 8 bank holidays). A part-time employee works 30 hours per week.
24 + 8 = 32 days ÷ 5 (number of working days per week) = 6.4 weeks
6.4 x 30 = 192 hours – part-time holiday entitlement.

Starting or leaving part‑way through a holiday year

Employee joiners and leavers are among the biggest causes of holiday‑pay disputes. The good news? The law is clear and we can help you get it right.

If employees join or leave part‑way through the holiday year, they are entitled to a pro‑rated amount based on the portion of the year they have worked.

For example, if an employee works five days a week and leaves halfway through the leave year, they will have accrued half of their annual entitlement (e.g., 14 out of 28 days).

This applies to:

• Full‑time staff
• Part‑time staff (with entitlement pro‑rated by hours/days and time served)
• Fixed‑term or short‑contract employees

Accurate calculations here are essential as errors can lead to overpayments, underpayments, or even legal claims.

How we help you calculate this correctly

Our team supports employers with fast, accurate and fully compliant pro‑rata calculations for:

• New starters part‑way through the holiday year
• Employees leaving your organisation mid‑year
• Staff changing working hours or moving between full‑time, part‑time or variable patterns

We ensure your calculations:

• Follow current statutory rules
• Apply correct accrual methods
• Reflect contract terms

Prevent costly disputes or payroll errors

Whether you need one‑off calculations, an audit of your current approach, or a complete policy update, we provide straightforward, reliable guidance you can trust.

What should I do next?

If you are an employer in need of advice or have a specific question on part-time holidays, please speak with us using the form below. We regret that we cannot deal with enquiries from individuals, and suggest that you contact ACAS.