Pro rata salary calculator UK 2026/27
Calculate the gross annual, monthly and weekly pay for a stated proportion of a full-time salary.
Keep the written contract as the source of truth for the percentage.
Your pro-rata gross salary
Gross pay before tax, pension and other deductions.
How to calculate a pro-rata salary
A straightforward pro-rata annual salary is full-time equivalent salary multiplied by the contractual part-time percentage. For example, 60% of a £40,000 full-time salary is £24,000 a year before tax. The calculator shows the annual, monthly-equivalent and weekly-equivalent gross figures.
It is a salary-fraction calculator. It does not decide the correct percentage for an unusual working pattern. Use the percentage stated by the employer or work it out from the contract before entering it.
Use the part-time salary calculator carefully
- Enter the full-time equivalent annual salary for the role.
- Enter the contractual fraction as a percentage, such as 60 for 0.6 FTE.
- Check the annual gross result against the written offer.
- Use the actual annual salary in the take-home pay calculator for an annualised net estimate.
When a simple pro-rata calculation may not match the offer
A pro-rata percentage may not capture term-time work, irregular shifts, a changed allowance, overtime, holiday arrangements or a different pensionable-pay definition. It may also be inappropriate when an employer has quoted a fixed part-time salary rather than a percentage of full time. In those cases, use the written salary as the main input and keep any calculation as a check.
Compare the actual hours as well as the salary
Pro-rata salary tells you the gross annual amount. It does not reveal the gross hourly value if different contracts use different hours or paid weeks. Use salary to hourly for that comparison. Keep tax, hours and non-cash benefits as separate questions rather than combining them into one misleading number.
Pro-rata salary questions
What does 0.8 FTE mean?
It generally means 80% of the full-time contractual hours or salary, but check the employer’s definition.
Is pro-rata pay after tax?
No. The calculator shows gross pay. Use the take-home calculator for an annualised after-tax estimate.
Can I enter 3 days out of 5?
Enter 60% when the arrangement is exactly three of five comparable full-time days. Use the contract where daily hours differ.
Rates and sources
Built from direct government sources for the 2026/27 tax year. HMRC rates and thresholds · Income Tax rates and allowances · full source ledger.