Pro Rata Salary Calculator UK
Calculate your pro rata salary instantly based on your working hours and see your fair annual, monthly and weekly pay in seconds with RootHR.
Your Pro Rata Salary
What Is a Pro Rata Salary?
A pro rata salary is a reduced salary that is based on the amount of time an employee works compared to a full-time role. Instead of receiving the full annual salary, the pay is adjusted in proportion to the hours or days worked.
For example, if a full-time job pays £40,000 per year for a 37.5-hour week, and you work 18.75 hours (half of full-time hours), your pro rata salary would be £20,000.
In simple terms, pro rata means “in proportion.” It ensures that employees working part-time or flexible hours are paid fairly based on the time they work compared to full-time staff.
How to Calculate pro rata calculator uk
The standard UK formula is:
Pro Rata Salary =
Full-Time Salary ×
(Employee Hours ÷ Full-Time Hours)Example:
| Full-time salary | £36,000 |
|---|---|
| Full-time hours | 40 |
| Employee hours | 30 |
| Percentage worked | 75% |
| Pro rata salary | £27,000 |
Who Should Use This pro rata pay calculator uk?
This calculator is useful for anyone working part-time or reduced hours who needs to understand their pay quickly and accurately.
Ideal for:
- Part-time employees
- Job seekers comparing salaries
- HR and payroll teams
- Employees moving to flexible or reduced hours
- Employers creating part-time roles
In short, it helps anyone working fewer hours than full-time calculate their fair salary in seconds.
When Is Pro Rata Pay Used?
Pro rata pay is used when an employee does not work full-time hours or works under a flexible arrangement. Instead of receiving a full-time salary, their pay is adjusted based on the proportion of hours or days they actually work.
Common situations where pro rata pay is used:
- Part-time jobs (e.g. 2, 3 or 4 days per week)
- Job sharing arrangements
- Reduced working hours after a contract change
- Returning to work after maternity or parental leave
- Flexible or hybrid working schedules
- Fixed-term or temporary roles with fewer hours
- Employees working different shift patterns compared to full-time staff
In all these cases, the salary is calculated fairly so that employees are paid in line with the hours they work compared to a full-time role.
Common salary pro rata Examples
| Full-time Salary | Hours Worked | Pro Rata Salary |
|---|---|---|
| £25,000 | 20/40 | £12,500 |
| £30,000 | 30/37.5 | £24,000 |
| £35,000 | 18.75/37.5 | £17,500 |
| £40,000 | 30/40 | £30,000 |
| £50,000 | 22.5/37.5 | £30,000 |
Benefits of Using RootHR's Pro rata salary calculator uk 2026
RootHR’s Pro Rata Salary Calculator is designed to be simple, fast and accurate, helping you understand your part-time or reduced-hours salary in seconds without any manual calculations.
Key benefits:
- Instant results – Get your pro rata salary in seconds
- Accurate calculation – Uses standard UK pro rata formula
- Multiple options – Choose how you calculate your pay:
- ○ Weekly hours
- ○ Working days
- ○ FTE (Full-Time Equivalent)
- Clear breakdown – See annual, monthly, weekly and hourly pay
- Useful for everyone – Ideal for employees, employers and HR teams
- Easy to use – Simple design, mobile-friendly and no spreadsheets needed
- Free tool – No signup or hidden charges
In short, it helps you quickly understand your real earnings and compare job offers with confidence.
Frequently Asked Questions
What is a pro rata salary?
A pro rata salary is the amount you earn based on the proportion of full-time hours or days you work. If you work fewer hours than a full-time employee, your annual salary is reduced proportionally while your hourly rate usually remains the same.
How do I calculate my pro rata salary?
To calculate your pro rata salary, multiply the full-time annual salary by the percentage of full-time hours you work.
Formula:
Pro Rata Salary = Full-Time Salary × (Your Weekly Hours ÷ Full-Time Weekly Hours)
For example, if a full-time salary is £40,000 for a 37.5-hour week and you work 30 hours, your pro rata salary would be £32,000.
Does pro rata salary affect my hourly pay?
No. In most cases, your hourly pay remains the same as a full-time employee’s. Your total salary is lower because you work fewer hours, not because your hourly rate is reduced.
Is pro rata salary calculated before or after tax?
A pro rata salary is your gross salary before deductions such as Income Tax, National Insurance and pension contributions. Your take-home pay will depend on your personal tax circumstances and any deductions that apply.
Does pro rata pay affect holiday entitlement?
Yes. Part-time employees usually receive holiday entitlement on a pro rata basis. This means your annual leave is calculated according to the number of days or hours you work compared with a full-time employee.
Who can use a pro rata salary calculator?
A pro rata salary calculator is useful for part-time employees, job seekers, employers, HR professionals, payroll teams and anyone comparing flexible or reduced-hours roles. It provides a quick estimate of annual, monthly and weekly earnings.
Can I calculate my salary based on working days instead of hours?
Yes. If your employer defines full-time work by the number of working days rather than hours, you can calculate your pro rata salary using the same principle. Simply compare the number of days you work with the full-time working week.
What does FTE mean?
FTE stands for Full-Time Equivalent. It represents the proportion of a full-time role that an employee works. For example, someone working 18.75 hours in a 37.5-hour week has an FTE of 0.5, meaning they work 50% of full-time hours.
Why should I use RootHR's Pro Rata Salary Calculator?
RootHR’s free Pro Rata Salary Calculator provides a quick and simple way to estimate your annual, monthly, weekly and hourly earnings based on your working hours. Whether you’re considering a new job, changing your working pattern or managing payroll, it helps you understand your expected salary in just a few clicks.
Looking for a Complete HR Solution?
Discover RootHR your all in one HR platform that simplifies hiring, onboarding, payroll, leave, attendance, employee records and compliance. Save time, reduce admin work and manage your workforce more efficiently.
