Pro Rata Salary Calculator
Make part time pay add up.
A full time salary on a job advert is only a starting point. Enter the full time hours and your proposed hours to see the pro rata gross salary and what you might take home.
Free to use
Updated for the 2026/27 tax year
The Salary Hub calculator
What is my pro rata pay?
Estimated take home
£1,893per month
£22,720 a year after deductions
Take homePensionTax, NI & loan
Annual gross pay£26,667
Income tax−£2,819
National Insurance−£1,128
Pension sacrifice−£0
Student loan−£0
Estimate for standard PAYE, 2026/27. Actual payroll figures can vary by tax code and pay schedule.
Behind the number
The pro rata formula
Full time annual salary × (your weekly hours ÷ full time weekly hours) = your annual pro rata salary.
- 01
A £40,000 full time role at 37.5 hours becomes about £26,667 for a 25 hour week.
- 02
The calculator then estimates tax, NI and optional student loan or pension deductions on your part time pay.
- 03
Check whether the employer defines full time as 35, 37.5 or 40 hours; that number changes the answer.
This estimates a straightforward hours-based reduction. Annual leave, bank holidays, allowances and term-time contracts may use different rules.
Keep exploring