Pro Rata Salary Calculator
Turn a full-time salary into your actual part-time pay — and what you take home.
United KingdomQuick answer
Pro-rata salary = full-time salary × (your hours ÷ full-time hours). A £35,000 job at 37.5 hours a week, worked for 22.5 hours (0.6 FTE), pays £21,000 a year — £1,750 a month before tax, or about £1,553 a month after income tax and National Insurance in 2026/27.
Your pro-rata salary
£21,000
- Share of full time (FTE)
- 0.6 (60%)
- Monthly gross
- £1,750
- Monthly take-home (2026/27)
- £1,553
- Hourly rate
- £17.95
Take-home uses England, Wales and NI rates with no pension or student loan.
Pro-rata pay and statutory holiday, 5-day full-time week
| Days per week | FTE | Pay on £30,000 FTE | Statutory holiday |
|---|---|---|---|
| 1 days | 0.2 | £6,000 | 5.6 days |
| 2 days | 0.4 | £12,000 | 11.2 days |
| 2.5 days | 0.5 | £15,000 | 14 days |
| 3 days | 0.6 | £18,000 | 16.8 days |
| 4 days | 0.8 | £24,000 | 22.4 days |
| 5 days | 1 | £30,000 | 28 days |
How it works
Job adverts for part-time roles often quote the full-time equivalent (FTE) salary — what the job would pay at full-time hours. Your actual 'pro-rata' pay is that salary multiplied by the share of full-time you work. Working 3 days of a 5-day week is 0.6 FTE, so a £30,000 FTE salary pays £18,000.
To work out pro rata pay step by step: (1) find the full-time salary and the full-time weekly hours in the job advert or contract; (2) divide your weekly hours by the full-time hours to get your FTE — 22.5 ÷ 37.5 = 0.6; (3) multiply the full-time salary by your FTE — £35,000 × 0.6 = £21,000 a year; (4) divide by 12 for monthly gross pay, £1,750. Pro rata salary is always before tax; the calculator also shows your take-home pay.
Use hours if your contract is in hours, and the employer's full-time week as the base — often 37.5 or 40 hours, sometimes 35. Your hourly rate is the same as a full-time colleague's; only the number of hours changes.
Part-time workers are entitled to the same statutory holiday as full-time staff, pro rata: 5.6 weeks a year. Someone working 3 days a week gets 16.8 days, including bank holidays; the statutory maximum is 28 days. Take-home is worked out with the 2026/27 rates from the UK take-home pay calculator. Working fewer hours to bring a high salary under £100,000? See how that interacts with the £100k tax trap.
More uk pay & tax calculators
Frequently asked questions
What does pro rata mean on a salary?
That the quoted salary is for full-time hours, and you will be paid in proportion to the hours or days you actually work.
How do I calculate part-time wages?
Multiply the full-time salary by your hours divided by the full-time hours. 20 hours of a £30,000, 37.5-hour job is £30,000 × 20 ÷ 37.5 = £16,000 a year.
Is a pro rata salary before or after tax?
Before tax. Income tax and National Insurance are then worked out on the pro rata amount — part-time earners often pay little or no tax because more of their pay falls under the £12,570 personal allowance.
How do I calculate my FTE?
Divide your weekly hours by the full-time weekly hours. 22.5 ÷ 37.5 = 0.6 FTE.
How much holiday do part-time workers get?
5.6 weeks a year, pro rata. Multiply the days you work each week by 5.6 — 3 days a week gives 16.8 days, including bank holidays.