Pro Rata Salary Calculator 2026/27
If a full-time salary is £35,000 for 37.5 hours per week and you work 22.5 hours, your pro rata salary is £21,000 per year or £1,750 per month. Your pro rata holiday entitlement is 16.8 days. Use our calculator below for your exact figures including take-home pay after tax.
Figures verified against HMRC PAYE & NI rates on .
Written by James HartleyCIMA
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The salary for the equivalent full-time role
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Your pro rata salary
£21,000
£1,750.00 per month · £403.85 per week
- Weekly£403.85
- Daily£134.62
- Hourly£17.95
- Monthly take-home (est.)£1,553.30
Pro Rata Holiday Entitlement
16.8 days per year
Based on UK statutory minimum of 28 days (5.6 weeks) for full-time workers. Your employer may offer more.
Take-Home Pay Breakdown
Full-Time vs Pro Rata Comparison
| Full-Time | Your Pro Rata | |
|---|---|---|
| Annual salary | £35,000 | £21,000 |
| Monthly salary | £2,917 | £1,750 |
| Weekly salary | £673 | £404 |
| Daily rate | £135 | £135 |
| Hourly rate | £18 | £18 |
| Take-home (annual) | £28,720 | £18,640 |
| Take-home (monthly) | £2,393 | £1,553 |
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How Pro Rata Salary Calculator 2026/27 Works
How pro rata salary is calculated
Your pro rata salary is calculated by multiplying the full-time salary by the ratio of your hours to full-time hours:
Pro rata salary = (Full-time salary ÷ Full-time hours) × Your hours
For example, if a full-time role pays £35,000 for 37.5 hours per week and you work 22.5 hours, your pro rata salary is £35,000 ÷ 37.5 × 22.5 = £21,000 per year. For holiday entitlement, pay rights, and take-home examples, see our pro rata salary guide.
Pro rata holiday entitlement
UK statutory minimum holiday is 28 days per year for full-time workers (5.6 weeks × 5 days). Part-time workers receive the same entitlement scaled to their working days:
Pro rata holiday = (28 ÷ Full-time days) × Your days
Working 3 days a week gives you 28 ÷ 5 × 3 = 16.8 days per year. Many employers round this up or offer more generous allowances.
Take-home pay for part-time workers
Your take-home pay uses official 2026/27 income tax and National Insurance rates. The personal allowance (£12,570) still applies in full, which means part-time workers often have a lower effective tax rate than full-time workers, as more of their income falls within the tax-free personal allowance.
Same hourly rate as full-time
Under UK law, part-time workers must receive the same hourly rate as comparable full-time colleagues. The Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000 make it unlawful to pay part-time workers less per hour simply because they work fewer hours.
Frequently Asked Questions
Pro rata is Latin for 'in proportion'. A pro rata salary is a salary that is proportional to the number of hours or days worked compared to a full-time equivalent. If a full-time role pays £35,000 per year and you work half the hours, your pro rata salary would be £17,500. Pro rata calculations ensure part-time workers are paid fairly in proportion to their full-time counterparts.
To calculate pro rata pay, divide the full-time salary by the full-time hours per week, then multiply by your actual hours per week. For example: £35,000 ÷ 37.5 hours × 22.5 hours = £21,000 per year. Alternatively, use the days method: £35,000 ÷ 5 days × 3 days = £21,000. Both methods give the same result when the hours-to-days ratio is consistent.
UK full-time workers are entitled to at least 28 days holiday per year (including bank holidays), equivalent to 5.6 weeks. Part-time workers receive the same entitlement on a pro rata basis. If you work 3 days a week instead of 5, your holiday entitlement is 28 × (3 ÷ 5) = 16.8 days per year. Your employer may round this up and offer additional holiday above the statutory minimum.
Yes - a pro rata salary is effectively a part-time salary scaled from the full-time equivalent. The term 'pro rata' is used to show the salary is proportional, making it easy to compare with the full-time role. Your hourly rate should be identical to the full-time employee doing the same job - the only difference is you work fewer hours.
Yes. Under the Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000, part-time workers have the right to the same hourly rate of pay as comparable full-time workers. This is known as the 'no less favourable' principle. Employers cannot pay part-time workers a lower hourly rate simply because they work fewer hours.
Related Guides
Part-Time Worker Rights in the UK: A Complete Guide
Everything part-time employees need to know about pay, holiday, pension auto-enrolment, and protections under UK employment law.
Read guideHow to Calculate Statutory Holiday Pay
UK rules for calculating holiday pay including irregular hours workers, overtime, and the 52-week average method.
Read guidePart-Time Worker Rights and Pay Guide
Know your rights: holiday entitlement, pro rata pay, pension auto-enrolment, redundancy, and maternity pay for part-time workers. 28-page PDF guide.
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Official Rates Used
This calculator uses official HMRC rates for 2026/27. View the current rates at GOV.UK:
Rates last verified:
Disclaimer: This calculator provides estimates based on standard HMRC rates for 2026/27. Results may vary based on individual circumstances. This is not financial advice. Always consult a qualified accountant or CIMA-qualified financial adviser for personal tax matters.