Pro-Rata Salary Calculator
Convert a full-time-equivalent (FTE) salary to the pay you actually get for your hours and weeks, then see it after tax.
e.g. 1257L, BR, K475, S1257L
Enter the full-time salary above and your own hours / weeks.
Your take-home pay · per month
£20,800 a year from £24,000 gross, you keep 86.7%
The pro-rata formula
Actual salary = FTE salary x (your weekly hours / full-time hours) x (weeks worked / 52). A £40,000 FTE role at 22.5 of 37.5 hours pays £24,000.
Term-time workers
If you work fewer than 52 weeks, enter the weeks you are paid for. Many employers then spread pay evenly across 12 months.
Tax on a lower income
Part-time pay often sits mostly inside your personal allowance and basic-rate band, so the effective tax rate is lower than on the FTE salary.
Frequently asked questions
Figures use official GOV.UK 2026/27 rates. See the methodology.
How do I calculate part-time pay from a full-time salary? +
Multiply the full-time salary by your hours divided by full-time hours. For 3 days of a 5-day week, multiply by 0.6.
Is holiday included in pro-rata? +
Most employers include holiday in the pro-rata salary; term-time contracts may use a different holiday method.
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