United Kingdom · Updated for 2026/27
Pro rata salary calculator 2026/27
On a £30,000 full-time salary, 3 days a week out of 5 is £18,000 a year pro rata (60%), £16,479.60 after tax. Holiday is pro rata too: the legal minimum of 5.6 weeks is 16.8 days a year for 3 days a week.
Type the full-time salary for the job, then your hours or days against full time.
3 of 5 days a week · £30,000 full time
£18,000 a year pro rata
60.0% of full time · take-home £16,479.60 a year, £1,373.30 a month
| Year | Month | |
|---|---|---|
| Salary | £18,000.00 | £1,500.00 |
| Income tax | −£1,086.00 | −£90.50 |
| National Insurance | −£434.40 | −£36.20 |
| Take-home pay | £16,479.60 | £1,373.30 |
Holiday
The legal minimum for 3 days a week is 16.8 days of paid holiday a year.
How is a pro rata salary worked out?
Divide what you work by full time, then multiply the full-time salary by the answer. 3 days of a 5-day week is 60%, so a £30,000 job pays £18,000. Hours work the same way: 22.5 of 37.5 hours is also 60%.
How is holiday worked out pro rata?
The legal minimum is 5.6 weeks of paid holiday a year, and it can include bank holidays. For someone who works a fixed number of days, that is 5.6 × days a week, up to 28 days: 16.8 days for 3 days a week. In hours, it is 5.6 × hours a week: 126 hours for 22.5 hours a week.
Many employers give more. If the job comes with 33 days a year full time, bank holidays included, 3 days a week gets 33 × 3 ÷ 5 = 19.8 days.
Why is my take-home more than the pro rata share?
Because tax isn’t pro rata. The Personal Allowance is the same whatever you earn, so it covers a bigger part of a smaller salary. Full time, £30,000 takes home £25,119.60; at 60% of the salary you take home £16,479.60, 65.6% of it. To turn the result into an hourly rate, try the hourly wage calculator.
What else can I work out?
- Hourly wage calculator An hourly rate to a yearly salary and take-home pay, and back again.
- Maternity pay calculator Statutory Maternity Pay week by week, whether you qualify, and the take-home.
- Pay rise calculator The extra take-home from a rise, and how much of it goes in tax, NI and loans.
- Salary calculator Take-home pay on any salary, with tax codes, Scotland, pensions and student loans.
Every UK tool on one page: salary and tax tools. How the rules work: UK pay and tax guides.
Questions about pro rata pay
What does pro rata mean?
In proportion. A pro rata salary is the full-time salary scaled to the hours you work: 3 days out of 5 is 60% of the full-time pay.
How do I work out holiday pro rata?
Everyone who works a fixed number of days a week is entitled to at least 5.6 weeks of paid holiday a year. Multiply your days a week by 5.6: 3 days a week is 16.8 days. Nobody is owed more than 28 days by law.
Do part-time workers get bank holidays?
There is no legal right to bank holidays off. Employers can count them as part of your holiday, and part-time staff should get them in proportion too. Your contract says how your employer does it.
Is part-time pay taxed differently?
No, the rates are the same. But your Personal Allowance (£12,570) is not cut pro rata, so you keep a bigger share of a smaller salary.
What if my hours change from week to week?
Then holiday is worked out differently: it builds up as you work. GOV.UK has the holiday entitlement rules for irregular hours and part-year work.