Free pro rata salary calculator for UK workers. Calculate part-time salary, 4-day week pay, and take home after tax. Works for any working pattern in 2026. Fast, accurate, no sign-up required.
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Common pro rata salary calculations for part-time and flexible working patterns. Use the calculator above for precise figures including tax and deductions.
| Full-Time Salary | 4 Day Week (80%) | 3 Day Week (60%) | Half Time (50%) |
|---|---|---|---|
| £25,000 | £20,000 | £15,000 | £12,500 |
| £30,000 | £24,000 | £18,000 | £15,000 |
| £40,000 | £32,000 | £24,000 | £20,000 |
| £50,000 | £40,000 | £30,000 | £25,000 |
Pro Rata Calculator Note: This pro rata salary calculator uses the standard formula: (Your Hours / Full-Time Hours) × Full-Time Salary. Always verify calculations with your HR department and check your employment contract for specific terms. VisitGOV.UK for official guidance on part-time worker rights.
| Annual Salary | Monthly Take Home (approx.) | Weekly Take Home (approx.) |
|---|---|---|
| £20,000 | £1,469 | £339 |
| £25,000 | £1,730 | £399 |
| £30,000 | £1,983 | £457 |
| £35,000 | £2,236 | £516 |
| £40,000 | £2,499 | £577 |
| £45,000 | £2,762 | £638 |
| £50,000 | £3,026 | £698 |
| £60,000 | £3,487 | £805 |
| £75,000 | £4,213 | £972 |
| £100,000 | £5,084 | £1,173 |
*After 20% basic rate tax, NI, assumes standard personal allowance 2026–27
The pro rata salary calculator uses a simple but important formula to ensure fair pay for part-time and flexible workers. Pro rata literally means "in proportion," ensuring you're paid fairly for the hours you work.
Pro Rata Salary = (Your Hours ÷ Full-Time Hours) × Full-Time SalaryWhether you're calculating full-time or pro rata salary, UK tax and NI are applied to your actual earnings. The basic formula is: Gross Salary - Income Tax - National Insurance = Take Home Pay
Important: Always verify tax calculations with official sources. VisitGOV.UK Income Tax rates andNational Insurance rates for the latest official information.
To calculate pro rata salary in the UK, use this formula: (Your Working Hours / Full-Time Hours) × Full-Time Salary. For example, if you work 3 days (24 hours) instead of 5 days (40 hours) with a full-time salary of £30,000, your pro rata salary would be: (24/40) × £30,000 = £18,000. Use our pro rata calculator above for instant results.
Pro rata salary means your pay is proportionally adjusted based on the hours or days you work compared to a full-time position. If you work part-time, your salary is calculated as a percentage of the full-time equivalent salary. This ensures fair compensation for flexible working patterns.
A £40,000 salary pro rata for 4 days a week (80% of full-time) would be £32,000 per year. This assumes a standard 5-day working week, so 4 days represents 80% of full-time hours. After tax and NI, this would be approximately £2,499 take home per month.
Yes, holiday entitlement is also calculated pro rata. If full-time employees get 28 days holiday (including bank holidays), someone working 3 days a week would get 16.8 days. Your pro rata salary typically includes the same benefits as full-time workers, adjusted proportionally.
For compressed hours (same total hours in fewer days), you typically receive the full salary, not pro rata. For example, working 37.5 hours over 4 longer days instead of 5 standard days means you still get 100% salary. Our pro rata calculator can help you determine the difference.
Your UK take home pay is calculated by deducting income tax and National Insurance contributions from your gross salary. For the 2026-27 tax year, the personal allowance is £12,570. Income above this is taxed at 20% (basic rate) up to £50,270, then 40% (higher rate) up to £125,140.
For a £30,000 annual salary in the UK (2026-27 tax year), the approximate take home pay is £23,800 per year, or around £1,983 per month, after income tax and National Insurance deductions.
For 2026-27, employees pay 8% National Insurance on earnings between £12,570 and £50,270 per year, and 2% on earnings above £50,270. The first £12,570 is exempt from National Insurance.
Part-time workers have the same employment rights as full-time staff, calculated pro rata:
Source: GOV.UK Part-time Workers' Rights
Common part-time and flexible working salaries across UK industries
| Sector | Full-Time Average | 4-Day Week (80%) | 3-Day Week (60%) |
|---|---|---|---|
| NHS Band 5 Nurse | £35,392 | £28,314 | £21,235 |
| Teacher (M6) | £43,685 | £34,948 | £26,211 |
| Admin Assistant | £23,500 | £18,800 | £14,100 |
| Software Developer | £55,000 | £44,000 | £33,000 |
| Retail Manager | £28,000 | £22,400 | £16,800 |
Data sources: NHS Pay Scales, Teachers' Pay Scales, ONS Average Weekly Earnings
Disclaimer: This pro rata salary calculator provides estimates only. Always verify calculations with your employer's HR department and check official government resources atGOV.UKfor the most current tax rates and employment regulations.
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