Pro rata salary calculator
Calculate part-time salary from full-time pay and weekly hours. See yearly, monthly and weekly gross pay, your share of the full-time post and estimated take-home pay for 2026/27.
Money games
Which pays more?
Two jobs: tap the one that takes home more.
10 roundsGuess the gross
See monthly take-home. Pick the salary behind it.
10 rounds
How do I calculate pay for part of a month?
Use the part-month salary calculator when you start or leave a job during a month. It divides monthly gross salary using calendar dates or agreed paid days. Check which method your employer uses. The pro rata calculator on this page adjusts pay for contracted weekly hours.
What the calculator assumes
- Your pay goes down in step with your hours. The hourly rate for the part-time post is the same as for the full-time post.
- You work every week of the year and are paid for your holiday, so the weekly figure is the yearly salary shared equally across the weeks in a year. The monthly figure is the yearly salary divided by twelve.
- The full-time equivalent is your hours as a percentage of the full-time hours.
- The take-home figures are for someone who pays income tax in England, Wales or Northern Ireland, with the standard tax code, no other income, no pension and no student loan.
- Term-time jobs, and jobs paid for only part of the year, are often pro rated by weeks as well as by hours. This calculator scales by hours only. Use the term-time salary calculator with your employer's confirmed paid weeks.
How pro rata pay is worked out
Pro rata means in proportion. A part-time salary is the full-time salary multiplied by your hours and divided by the full-time hours. If you work three fifths of the full-time hours, you are paid three fifths of the full-time salary.
Job adverts for part-time posts often show the full-time salary with the words "pro rata" after it. That figure is what the post would pay a full-time worker, not what you will receive. Enter it as the full-time salary, add the full-time hours from the advert and your own hours, and the calculator gives the salary you would actually earn.
Tax is worked out on the pro rata salary, not the full-time one. Because the personal allowance and the National Insurance threshold stay the same whatever your hours, a smaller share of a part-time salary goes in tax. The take-home pay calculator shows the full working, including Scotland, pensions and student loans. For pay quoted by the hour, the hourly pay converter works out the yearly figure.
For forms with Scottish tax, pensions and loans, compare part-time salary calculators.
Pro rata holiday
Almost all workers are legally entitled to 5.6 weeks of paid holiday a year, and part-time workers with regular hours get the same number of weeks. If a part-time week has fewer working days, the holiday comes to fewer days than a full-time worker gets. GOV.UK explains the rules on its holiday entitlement page, which also has a calculator for part-time leave.
Spotted a mistake?
Use the report form. Tell us the salary and hours you entered and what you expected to see. Fixed errors are listed on the corrections page.