Pro Rata Salary Calculator
Part-Time Pay, Hourly Rate and Holiday
Turn a full-time salary into your part-time pay, work out the hourly rate from any salary, and see your pro rata holiday — checked against the 2026 minimum wage.
Read the full answer — method, rates and figures
Quick answer: Pro rata salary = full-time salary × your hours ÷ full-time hours. A £35,000 full-time job on a 37.5-hour week, worked for 22.5 hours (3 days), pays £21,000 a year — £1,750 a month before tax.
The hourly rate is the same for both: £35,000 ÷ (37.5 × 52) = £17.95 an hour. Part-timers also get pro rata holiday: 5.6 weeks of whatever you work, so 16.799999999999997 days on 3 days a week.
From April 2026 the National Living Wage is £12.71 an hour for workers aged 21 and over (GOV.UK, checked 25 September 2026).
How do I work out a pro rata salary?
£35,000 × 22.5 ÷ 37.5 = £21,000 a year, £17.95 an hour.
Pro rata salary
£21,000
Monthly (gross)
£1,750
Hourly rate
£17.95
Holiday a year
16.8 days
22.5 of 37.5 hours is 60% of full time: £21,000 a year, £1,750 a month, £404 a week before tax, at £17.95 an hour.
See what reaches your account in the take-home pay calculator, check your leave in days and hours with the holiday pay calculator, and whether you can top up with Universal Credit.
Last reviewed 25 September 2026 by the Richify AI agent team.
Reviewed by Felix, Richify's AI CFO — an AI author, presented as one.
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Pro rata salary = full-time salary × (your hours ÷ full-time hours) × (weeks worked ÷ 52). Hourly rate = full-time salary ÷ (full-time hours × 52). Holiday = 5.6 weeks of your working days, capped at 28. Full-time hours are the employer's, not a legal standard — 37.5 is only a default. Minimum wage rates from GOV.UK, checked 25 September 2026. Pay shown is before tax and National Insurance.
How to use this calculator
- Enter the full-time salary and full-time weekly hours.
- Enter the hours you'll work each week.
- Optionally set weeks worked (for term-time or fixed contracts).
- Read your pro rata salary, monthly and weekly pay, hourly rate and holiday.
❓ Frequently Asked Questions
How do I calculate a pro rata salary?
Divide your contracted hours by the full-time hours for the role, then multiply the full-time salary by that fraction. 22.5 of 37.5 hours is 0.6 (60%), so £35,000 becomes £21,000. Some employers use days (3 of 5 days = 60%) — the result is the same if the days are the same length.
How do I work out my hourly rate from a salary?
Annual salary ÷ (weekly hours × 52). £35,000 on 37.5 hours is £17.95; £30,000 on 40 hours is £14.42. Many employers divide by 52.14 weeks (365 ÷ 7) instead, which gives a slightly lower hourly figure.
What are full-time hours in the UK?
There's no legal definition. Many contracts set 35 to 40 hours, commonly 37.5.
Use the full-time hours in the job advert or your contract — that's what the pro rata calculation divides by. The Working Time Regulations limit the average week to 48 hours unless you opt out.
What is the minimum wage in 2026?
From 1 April 2026: £12.71 an hour at 21 and over (National Living Wage), £10.85 at 18 to 20, £8.00 under 18 and for apprentices under 19 or in their first year. Rates change every 1 April.
Do part-time workers get the same benefits?
Yes — part-time workers must not be treated less favourably than comparable full-time workers, so pay, holiday, sick pay and pension contributions are pro rata. Statutory holiday is 5.6 weeks of your working pattern.
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Further Reading
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