Pro-rata calculator
Pro-Rata Calculator 2026/27
Scale a full-time salary to your part-time hours or days, see your take-home pay after tax for 2026/27, and find out your pro-rata holiday entitlement.
Your details
The full-time salary the role pays.
Your results
Pro-rata gross salary
£16,000(££30,000 ÷ 37.5 hrs) × 20 hrs
Annual take-home
£14,464Monthly take-home
£1,205Holiday entitlement
14.9 dayspro-rata of 28 statutory days
Income Tax
£526National Insurance
£210Pension
£800Where your money goes
| Band | Yearly | Monthly | Weekly | % of Gross |
|---|---|---|---|---|
| Income Tax | £526 | £44 | £10 | 3.29% |
| National Insurance | £210 | £18 | £4 | 1.32% |
| Pension | £800 | £67 | £15 | 5% |
| Take-home pay | £14,464 | £1,205 | £278 | 90.4% |
What is a Pro-Rata Salary?
Pro-rata is Latin for "in proportion". Employers use it to scale a full-time salary to match the hours or days you actually work. If a full-time role pays £30,000 for 37.5 hours a week and you work 20 hours, your salary is scaled by the same ratio — around £16,000 a year.
This calculator applies the exact same 2026/27 tax rules to your pro-rata gross salary, so you get an accurate take-home figure for your part-time contract — including income tax, National Insurance, pension and student loan repayments.
The Pro-Rata Formula
Hours per week
pro-rata = (full-time salary ÷ full-time hours) × your hours
Example: (£30,000 ÷ 37.5) × 20 = £16,000
Days per week
pro-rata = (full-time salary ÷ full-time days) × your days
Example: (£30,000 ÷ 5) × 3 = £18,000
2026/27 Income Tax Bands
The same bands apply to your pro-rata salary. Scotland uses its own rates.
| Taxable income band | Rest of UK | Scotland |
|---|---|---|
| Up to £12,570 (personal allowance) | 0% | 0% |
| £12,571 – £15,629 | 20% | 19% |
| £15,630 – £27,491 | 20% | 20% |
| £27,492 – £43,662 | 20% | 21% |
| £43,663 – £50,270 | 20% | 42% |
| £50,271 – £75,000 | 40% | 42% |
| £75,001 – £125,140 | 40% | 45% |
| Above £125,140 | 45% | 48% |
Frequently asked questions
What does pro-rata mean?
Pro-rata means "in proportion". Your salary is scaled in line with the hours or days you work compared with a full-time equivalent role, so part-time staff earn a fair share of the full-time salary.
How do I calculate my pro-rata salary?
Divide the full-time salary by the full-time hours (or days) per week, then multiply by your actual hours (or days) per week. For example: (£30,000 ÷ 37.5) × 20 = £16,000.
Do part-time workers get the same annual leave as full-time staff?
Part-time workers are entitled to a pro-rated version of the 28 statutory days (including bank holidays). Use the same ratio — your hours divided by full-time hours, multiplied by 28 — as this calculator does.
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