Pro Rata Holiday Calculator
How to Calculate Pro Rata Holiday Entitlement
Understanding holiday entitlement for part-time workers or employees who start part-way through a leave year is essential for both employers and staff. "Pro rata" simply means "in proportion," ensuring that part-time employees receive a fair amount of leave compared to their full-time counterparts.
The Pro Rata Formula
The standard calculation for determining holiday allowance for part-time workers is based on the proportion of days they work compared to a standard full-time week. The basic formula is:
(Days Worked ÷ Full-Time Days) × Annual Entitlement = Pro Rata Holiday
For example, if a full-time employee gets 28 days of leave working 5 days a week, a part-time employee working 3 days a week would calculate:
- (3 ÷ 5) = 0.6
- 0.6 × 28 days = 16.8 days
Starting or Leaving Part-Way Through the Year
If an employee starts or leaves a job part-way through the holiday year, their entitlement must be pro-rated further based on the time they were employed. This is often calculated monthly. Our calculator above includes a "Months Employed" field to handle this scenario automatically.
Statutory Rights (UK Context)
In the UK, almost all workers are legally entitled to 5.6 weeks' paid holiday a year (known as statutory leave entitlement or annual leave). This equates to:
- 28 days for someone working 5 days a week.
- Part-time workers get the same 5.6 weeks, but because their weeks are shorter, this translates to fewer actual days off.
Dealing with Bank Holidays
Bank and public holidays can be included in your minimum statutory leave entitlement. There is no statutory right to paid leave on bank holidays specifically; however, if they are included in the total entitlement, part-time workers should not be disadvantaged if they do not work on Mondays (when most bank holidays fall).
Rounding Holiday Days
The law states that you cannot round down holiday entitlement. If the calculation results in a fraction (e.g., 16.8 days), many employers round up to the nearest half or full day to simplify administration, though keeping it as a decimal is legally permissible for payment in lieu upon leaving.