Pro Rata Salary Calculator UK (2026) – Part-Time Pay

Pro Rata Salary Calculator

Trying to work out what a full-time salary becomes when you reduce your hours can be confusing, especially when tax, pension, and holiday entitlement also change.

This pro rata salary calculator helps you estimate your part-time salary, monthly pay, hourly rate, take-home pay, and holiday entitlement in a few simple steps.

1. Full-time details

£

2. Your part-time pattern

How to use this pro rata salary calculator

Using our tool is straightforward. Follow these three simple steps to estimate your part-time pay:

Step 01

Enter full-time details

Input the full-time annual salary and standard working hours for the role (e.g. 40 hours).

Step 02

Choose your pattern

Select how you want to calculate your pro rata salary—by hours, days, percentage, or term-time.

Step 03

Check your results

The calculator instantly shows your estimated part-time salary, take-home pay, and holiday entitlement.

What does pro rata salary mean?

"Pro rata" is a Latin term meaning "in proportion." When an employer offers a pro rata salary, it means the quoted amount is what you would earn if you worked full-time. Because you work part-time, your actual pay is calculated as a proportion of that full-time salary, based on the hours or days you work.

How pro rata salary is calculated

To calculate a basic pro rata salary, you divide your actual working hours by the full-time working hours, then multiply that by the full-time salary.

The Formula

Pro-rata salary = Full-time salary × (Actual hours ÷ Full-time hours)

Example

If the full-time salary is £30,000 for a 40-hour week, and you work 24 hours:
£30,000 × (24 ÷ 40) = £18,000

What your results show

  • Annual & Monthly Pay: Your gross part-time income before any deductions.
  • Hourly Rate: Useful for confirming your pay meets the National Minimum Wage. Pro rata work does not reduce your hourly value.
  • Estimated Take-Home (Net Salary): We estimate your Income Tax, National Insurance, and chosen deductions (like student loan or pension) to give you an idea of your actual budget.
  • Holiday Entitlement: Statutory leave in the UK is 5.6 weeks. We proportionally adjust this for your part-time schedule in both days and hours.

When this calculator is useful

You will find this tool helpful if you are navigating changes in your working pattern or evaluating new opportunities:

New Job Offers

Comparing a part-time job offer against your current role or other opportunities.

Reduced Hours

Moving from full-time to part-time, or returning from maternity, paternity, or sick leave.

Lifestyle Planning

Planning a 4-day working week to see how it impacts your real-world take-home pay.

Education Sector

Checking term-time or part-year pay if you work in education or on a specific contract.

Professionals Check

HR or payroll teams needing to quickly verify employee pro rata calculations.

Budget Analysis

Comparing your gross salary with estimated take-home pay to plan your monthly budget.

Frequently asked questions

How do I calculate pro rata salary in the UK?
Take your actual working hours, divide them by the standard full-time hours, and multiply by the full-time salary. Our calculator automates this and also estimates your tax and pension.
What is £30,000 pro rata for 3 days a week?
Assuming a standard 5-day week, 3 days is 60% of the hours. Your pro rata gross salary would be £18,000.
What is £40,000 pro rata for 4 days a week?
For a 4-day week (80% of a standard 5-day week), the pro rata gross salary is £32,000.
Does pro rata salary include holiday pay?
Yes, salaried employees receive their normal pro rata pay when taking annual leave. Your holiday entitlement itself is also calculated pro rata.
How is pro rata holiday entitlement calculated?
Multiply the statutory 5.6 weeks by your working days per week. For example, if you work 3 days a week: 3 × 5.6 = 16.8 days of paid holiday.
Are bank holidays included in pro rata holiday?
It depends on your contract. Often employers give a total holiday pot (e.g., 28 days including bank holidays) and pro rata the whole amount. You then deduct holidays for any bank holidays that fall on your normal working days.
Is pro rata salary before or after tax?
Pro rata salary is always quoted as a "gross" figure (before tax). You must deduct Income Tax, National Insurance, and other contributions to find your net take-home pay.
How does part-time work affect National Insurance?
You only pay NI if your earnings exceed the Primary Threshold (currently £242 a week/£1,048 a month). A reduced pro rata salary may drop you below this threshold, meaning you pay zero NI.
What is the difference between pro rata salary and hourly pay?
Your hourly rate stays exactly the same whether you work full-time or part-time. Pro rata salary merely reflects the total amount you earn over the year for working fewer hours.
Can compressed hours reduce my salary?
No. If you work your full-time hours (e.g., 40 hours) but compressed into fewer days (e.g., 4 days), you are still working 100% of your hours. Your salary and holiday entitlement in hours remains the same.