Pro-Rata Salary Calculator
Turn a full-time salary into your part-time pay, by hours or days, with your hourly rate, holiday and take-home pay.
Your part-time pay
The pro-rata formula
Pro-rata salary = full-time salary × (your hours ÷ full-time hours)
Common part-time patterns
| Pattern | Share of full time | On £30,000 |
|---|---|---|
| 4 days a week | 80% | £24,000 |
| 3 days a week | 60% | £18,000 |
| 2.5 days a week | 50% | £15,000 |
| 2 days a week | 40% | £12,000 |
Pro-rata holiday
The legal minimum is 5.6 weeks a year (28 days for a five-day week, which can include bank holidays). Part-time staff get the same 5.6 weeks: multiply the days you work each week by 5.6. Your employer may offer more.
Thinking about an hourly job instead? Try the hourly to salary calculator.
Related guides: part-month salary, term-time only pay explained and bank holidays for part-time workers.
Guide: what does pro rata mean?
Sources
Figures are checked against these official sources. Last reviewed 7 November 2026.
Common questions
What does pro rata mean on a job advert?
It means the salary shown is the full-time equivalent. If you work fewer hours, you are paid the same proportion of it. A job advertised at £30,000 pro rata for 22.5 hours out of 37.5 pays £18,000.
How do I calculate a pro-rata salary?
Divide your hours by the full-time hours and multiply by the full-time salary. For example 22.5 ÷ 37.5 = 0.6, and 0.6 × £30,000 = £18,000.
Do part-time workers get pro-rata holiday?
Yes. Everyone is entitled to 5.6 weeks of paid holiday a year. Part-time workers get the same 5.6 weeks, which works out as a pro-rata number of days. Someone working 3 days a week gets 16.8 days.
Will I pay less tax working part time?
Usually yes, as a share of your pay. The first £12,570 is tax-free, so a lower salary means a bigger proportion of it is untaxed.
Is my part-time hourly rate the same as full time?
It should be. Under the Part-time Workers Regulations, part-time staff must not be treated less favourably than comparable full-time staff, including on hourly pay.