Use this free pro rata salary calculator to work out your part-time pay from a full-time salary, including your monthly pay, hourly rate and pro rata holiday.
UK part-time pay · 2026Pro Rata Salary Calculator UK
All figures are gross, before tax and National Insurance. Holiday is the statutory minimum of 5.6 weeks, capped at 28 days.
Our free pro rata salary calculator works out what you will earn if you work fewer hours than full-time. First, enter the full-time salary and hours. Then add your own hours, and the calculator shows your annual, monthly, weekly and hourly pay. In addition, it works out your pro rata holiday and your pay if you start or leave partway through the year.
What Does Pro Rata Salary Mean?
Pro rata is Latin for "in proportion". In other words, a pro rata salary is a share of the full-time salary that matches the hours you actually work. For example, if you work half the full-time hours, you earn half the full-time salary.
Job adverts often say "£30,000 pro rata". This means £30,000 is the full-time figure. Therefore, a part-time worker on that job earns less in total, although their hourly rate stays the same.
How the Pro Rata Salary Calculator Works
The calculation compares your hours with full-time hours. As a result, you get the percentage of the full-time salary you will earn.
First, divide your weekly hours by the full-time hours.
Then multiply the full-time salary by that share.
Finally, divide by 12 for monthly pay or by 52 for weekly pay.
The formula
Pro rata salary = Full-time salary × (Your hours ÷ Full-time hours)
Pro Rata Salary Calculator Examples
Here are three common situations. In each case, full-time hours are 37.5 per week.
The full-time salary is £30,000. She works 22.5 hours, which is 60% of full-time.
- 22.5 ÷ 37.5 60%
- £30,000 × 60% £18,000
- Monthly £1,500
The full-time salary is £42,000. Because he works 30 hours, he earns 80% of it.
- 30 ÷ 37.5 80%
- £42,000 × 80% £33,600
- Holiday 22.4 days
She works full-time on £36,500 but only from 1 October to 31 December, which is 92 days.
- Full year £36,500
- × 92 ÷ 365 £9,200
- Hours Full-time
Pro Rata Salary Table
The table shows the pro rata salary for common part-time hours. In each case, a full-time week is 37.5 hours.
| Full-time salary | 15 hours | 20 hours | 22.5 hours | 30 hours |
|---|---|---|---|---|
| £20,000 | £8,000 | £10,667 | £12,000 | £16,000 |
| £25,000 | £10,000 | £13,333 | £15,000 | £20,000 |
| £30,000 | £12,000 | £16,000 | £18,000 | £24,000 |
| £40,000 | £16,000 | £21,333 | £24,000 | £32,000 |
| £50,000 | £20,000 | £26,667 | £30,000 | £40,000 |
Gross annual pay, rounded to the nearest pound.
Pro Rata Holiday Entitlement
Almost all UK workers have the right to 5.6 weeks of paid holiday a year. For part-time workers, this is worked out in proportion to the days or hours they work.
- By days: multiply 5.6 by the days you work each week. For example, 3 days a week gives 16.8 days of holiday.
- By hours: multiply 5.6 by your weekly hours. So 22.5 hours a week gives 126 hours of holiday.
- The cap: statutory leave is capped at 28 days, which is what a 5-day full-time worker gets.
- Bank holidays: these can be included in the 5.6 weeks. However, your contract may give you more.
Starting or Leaving Partway Through the Year
If you join or leave a job during the year, you are paid only for the time you work. Therefore, the calculator multiplies your annual pro rata salary by the number of days you work and divides by 365. To use it, tick the part-year box and enter your start and end dates.
How to Use the Pro Rata Salary Calculator
- First, enter the full-time annual salary for the job.
- Next, check the full-time hours per week. Many employers use 37.5, while others use 35 or 40.
- Then enter the hours and days you work each week.
- If you start or leave during the year, tick the box and add your dates.
- Finally, press Calculate Salary to see your pay and holiday.
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Pro Rata Salary Calculator FAQs
How do I calculate a pro rata salary?
First, divide your weekly hours by the full-time hours. Then multiply the full-time salary by that figure. For example, 22.5 hours out of 37.5 is 60%, so a £30,000 salary becomes £18,000.
What does pro rata mean on a job advert?
It means the advertised salary is the full-time figure. Therefore, if you work fewer hours, you are paid a proportional share of it. A job listed at £30,000 pro rata for 3 days a week pays £18,000.
Is my hourly rate lower if I work part-time?
No. Part-time workers have the right to the same hourly rate as comparable full-time staff. Because of this, only your total pay changes, not your rate per hour.
How much holiday do part-time workers get in the UK?
Most workers get 5.6 weeks of paid holiday a year. So someone who works 3 days a week gets 5.6 × 3 = 16.8 days. In addition, full-time workers' statutory leave is capped at 28 days.
Is a pro rata salary before or after tax?
The pro rata salary is a gross figure, before Income Tax and National Insurance. However, your take-home pay will be lower once those deductions are made.
How accurate is this pro rata salary calculator?
It uses the standard UK method of hours worked divided by full-time hours. Even so, your employer may round figures differently, so check your contract for the exact amounts.
Disclaimer: This calculator gives an estimate for general information only. All figures are gross pay before tax and National Insurance. Moreover, your employer may calculate pro rata pay slightly differently, so check your contract for the exact figures.