Calculating holiday entitlement for part-time and part-year workers can be complex, especially in the UK where employment laws require pro-rata adjustments. This tool helps HR and payroll teams quickly determine the correct amount of annual leave for employees who haven’t worked the full year or full hours.
Whether your employee started mid-year or works reduced hours, understanding their pro-rata entitlement ensures fair treatment and legal compliance. This calculator is tailored for UK employment law, where holiday entitlement is based on actual hours worked, and part-time workers are entitled to the same leave per hour as full-time workers.
How the calculation works
In the UK, the pro-rata holiday entitlement for part-time workers is calculated based on the number of hours they work compared to a full-time equivalent. The standard annual leave entitlement in the UK is 28 days (including public holidays) for full-time workers. For part-time employees, the entitlement is calculated using the following formula:
Pro-Rata Entitlement = (Employee's Working Hours / Full-Time Working Hours) × Annual Entitlement.
For example, if a part-time employee works 20 hours per week and a full-time position is 37.5 hours per week, their pro-rata entitlement would be (20 / 37.5) × 28 = approximately 15 days of annual leave. This calculation ensures part-time workers receive the same leave entitlement per hour as their full-time counterparts, in accordance with UK employment law.
How to use this calculator
- Enter the total standard holiday entitlement for a full-time employee (e.g., 28 days in the UK).
- Input the number of hours the part-time employee works per year (or per week if calculating weekly pro-rata).
- Enter the number of hours a full-time employee would work over the same period.
- Click 'Calculate' to determine the pro-rata holiday entitlement.
- Review the result and apply it to your payroll or HR system as needed.