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Pro Rata Pay Calculator
Turn a full-time salary into your part-time pay. Enter the advertised salary and your hours or days per week. The annual, monthly, weekly and hourly figures update as you type.
- Works by hours or by days per week
- Gross pay, before tax and National Insurance
- All maths done in your browser
Timesheet · pro rata pay
How pro rata pay works
Pro rata means in proportion. A part-time salary is the full-time salary scaled down to the share of hours you actually work. The hourly rate stays the same; only the hours change. The formula:
pro rata salary = full-time salary × your hours ÷ full-time hours
For a days-based contract: full-time salary × your days ÷ 5. And the hourly rate behind any salary: full-time salary ÷ 52 ÷ full-time weekly hours.
A typical UK full-time week is 37.5 hours (9 to 5 with an hour of unpaid lunch) or 40 hours. Check the job advert or contract, since it changes the result.
Worked examples
| Situation | The sum | Pro rata salary |
|---|---|---|
| £30,000 full-time (37.5h), you work 25 hours | 30,000 × 25 ÷ 37.5 | £20,000 |
| £42,000 full-time (40h), you work 30 hours | 42,000 × 30 ÷ 40 | £31,500 |
| £28,000 full-time, you work 3 days of 5 | 28,000 × 3 ÷ 5 | £16,800 |
In the first example the hourly rate is £15.38 either way. The part-time worker simply gets paid for 25 hours instead of 37.5.
National Minimum Wage check
Whatever the pro rata sum says, the hourly rate must not fall below the legal minimum for your age. These are the rates from 1 April 2026:
Rates change every April. Check the current figures on gov.uk before relying on them.
Pro rata questions, answered
What does pro rata mean?
Pro rata is Latin for "in proportion". When a salary is advertised as "£30,000 pro rata", the £30,000 is the full-time figure and you get the share that matches your hours. Work half the full-time hours, get half the pay: £15,000. The same idea applies to holiday, bonuses and other benefits that scale with time worked.
How do I work out a pro rata salary?
Take the full-time salary, multiply by your weekly hours, and divide by the full-time weekly hours. For example: £30,000 × 25 ÷ 37.5 = £20,000. If the job is measured in days rather than hours, multiply the salary by your days and divide by 5.
Is holiday entitlement pro rata too?
Yes. Part-time workers get the same 5.6 weeks of statutory leave as full-time staff, but a week means their own working week. Someone on 3 days a week gets 5.6 × 3 = 16.8 days. Use our holiday entitlement calculator for the exact figure.
Does pro rata apply to bank holidays?
There is no statutory right to bank holidays off in the UK. Employers can count them as part of the 5.6 weeks. To avoid part-time staff who never work Mondays losing out, many employers pro rata the bank holiday allowance: a 3-day-a-week worker would get 3/5 of the 8 bank holidays in England and Wales, about 4.8 days, added to their pot.
How does pro rata work for term-time contracts?
Term-time staff are usually paid for the weeks they work plus their holiday entitlement, with the total spread over 12 equal monthly payments. Since April 2024, holiday for part-year workers accrues at 12.07% of hours actually worked rather than being averaged over the whole year.
Can a pro rata salary fall below the minimum wage?
No. The National Minimum Wage applies per hour worked, whatever your contract says. Divide the pro rata salary by 52 and then by your weekly hours: if the result is below the rate for your age band (£12.71 for 21 and over from 1 April 2026), the employer is breaking the law.
Is the hourly rate different for part-time staff?
Not under pro rata. The whole point is that the hourly rate stays the same and only the number of hours changes. £30,000 for a 37.5-hour week is £15.38 an hour whether you work 37.5 hours or 20. Paying part-time staff a lower hourly rate for the same job can amount to unlawful less favourable treatment.
Is a pro rata salary quoted before or after tax?
Before tax, like almost all advertised salaries. The figures from this calculator are gross pay. Income Tax and National Insurance come off afterwards through PAYE, so your take-home pay will be lower.
Working out your annual leave as well? Try the holiday entitlement calculator.