Free UK pay tool · 2026/27
Pro-rata salary calculator
Calculate your actual part-time or term-time salary from the full-time equivalent, then estimate monthly take-home pay.
How to calculate a pro-rata salary
Divide your weekly hours by the full-time weekly hours, then multiply the full-time salary by that fraction. If the role is paid for fewer than 52 weeks, the calculator also applies the paid-weeks fraction.
For example, 24 hours compared with a 37.5-hour full-time week is 64%. On a £40,000 full-time salary with 52 paid weeks, the gross pro-rata salary is £25,600.
Term-time and unpaid weeks
Some employers quote a term-time salary that already includes holiday pay or annualisation. Check whether the advertised figure is a full-time equivalent or the actual salary before using it here, otherwise you may reduce it twice.
From gross pro-rata salary to take-home pay
The result includes an estimated monthly take-home figure after Income Tax and employee National Insurance. Pension contributions, student loans, tax codes and Scottish tax bands can change the final payslip.
Frequently asked questions
How do I calculate a pro-rata salary?
Divide your weekly hours by the full-time weekly hours, then multiply that fraction by the full-time annual salary. Apply a paid-weeks adjustment as well if the job is not paid for all 52 weeks.
What is the pro-rata salary for £40,000 at 24 hours a week?
If full-time hours are 37.5 and all 52 weeks are paid, 24 hours is 64% of full time, giving a gross pro-rata salary of £25,600.
Does pro-rata salary include holiday pay?
That depends on the contract. Some employers annualise term-time pay and include holiday pay in the quoted actual salary, so check whether the advertised amount is full-time equivalent or already pro-rated.
Can I calculate pro-rata take-home pay?
Yes. This calculator first works out the gross pro-rata salary, then estimates monthly take-home pay after Income Tax and employee National Insurance.
Related pay calculators
These are estimates for one employment using 2026/27 rules. For tax codes, student loans, different UK regions and other deductions, use the full take-home pay calculator. Read how we calculate your pay for the rates, assumptions and limits.