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.
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.