Pro-Rata Salary Calculator (UK, 2026/27)
Going part-time or offered a pro-rata salary? Enter the full-time salary and hours, then your own hours or days, to see your actual salary, your take-home pay after Income Tax and National Insurance in 2026/27, and your statutory holiday. Results update instantly. No sign-up.
England, Wales or Northern Ireland, tax code 1257L, NI category A, the same pay every month.
- Share of full-time0%
- Gross a month£0
- Income Tax (year)£0
- National Insurance (year)£0
- Take-home pay (year)£0
- Take-home pay (month)£0
- Statutory paid holiday0 days
Full-time vs your pro-rata pay
| Item | Full-time | Your pro-rata |
|---|
Your holiday entitlement
GOV.UK: almost all workers are entitled to 5.6 weeks' paid holiday a year, capped at 28 days. Your contract can give more.
| Entitlement | Days | Hours |
|---|
Share of full-time pay you keep
Take-home pay as a share of full-time take-home (purple), against your share of full-time hours (dashed). The gap is the tax-free allowance and NI threshold working harder on a smaller salary.
Quick answer
A £30,000 full-time salary for 37.5 hours a week, worked at 22.5 hours a week, is £18,000 pro-rata (60%). In England, Wales or Northern Ireland in 2026/27 that is about £1,373 a month after Income Tax and National Insurance, with a statutory minimum of 16.8 days of paid holiday. Tax code 1257L, NI category A, even pay. Rules from GOV.UK, checked 18 October 2026.
Other part-time patterns
The same full-time salary at different shares of full-time. Your row is highlighted.
| Share of full-time | Pro-rata salary | Take-home a month | Share of full-time take-home |
|---|
How pro-rata salary works
A pro-rata salary is the full-time salary (often called the FTE salary) scaled to the hours you work. If the full-time job is 37.5 hours a week and you work 22.5, you get 22.5 ÷ 37.5 = 60% of it: £18,000 of a £30,000 salary. Some contracts pro-rate by days instead; when your days are a different length from full-time days, the two methods give different answers, and the calculator warns you.
Why your take-home is a bigger share than your hours
The salary is pro-rated, but the £12,570 Personal Allowance and the £12,570 National Insurance threshold are not. On a smaller salary a larger part is untaxed, so at 60% of the hours you keep about 66% of the full-time take-home in the example above. Take-home pay comes from the same tested engine as our UK take-home pay calculator.
Part-time holiday entitlement
GOV.UK: “Almost all people classed as workers are legally entitled to 5.6 weeks' paid holiday a year.” For a part-time worker on regular hours that is 5.6 × the days you work a week: “if they work 3 days a week, they must get at least 16.8 days' leave a year (3 × 5.6).” Statutory paid holiday is limited to 28 days, and an employer can include bank holidays in it. If your contract gives full-time staff more than the minimum, it is usually pro-rated by the same share as your pay; the calculator shows that figure next to the statutory minimum, in hours and in days of your length.
Workers with irregular hours or who work only part of the year build up holiday differently (GOV.UK's accrual rules), which this calculator does not model.
What this calculator does not cover
- Scottish Income Tax, other tax codes and NI letters: use the annual figure in the Advanced mode of the take-home pay calculator.
- Irregular-hours and part-year workers' holiday accrual.
- Pay that is not pro-rated in your contract, such as some allowances.
The formula
- By days: full-time salary × (your days ÷ full-time days)
- Statutory holiday = 5.6 × days you work a week, up to 28 days
- Contract holiday, pro-rated = full-time days × full-time hours a day × your share, shown in hours
See the formula with your own numbers
These update live from the calculator inputs above.
Frequently asked questions
How do I work out a pro-rata salary?
Divide your hours by the full-time hours and multiply by the full-time salary. For 22.5 hours of a 37.5-hour job paying £30,000: 22.5 ÷ 37.5 = 60%, so £18,000 a year.
How much holiday do part-time workers get?
GOV.UK says almost all workers are entitled to 5.6 weeks' paid holiday a year. Part-time workers on regular hours get 5.6 times the days they work each week: 3 days a week gives at least 16.8 days. Statutory paid holiday is capped at 28 days.
Is the Personal Allowance pro-rated for part-time work?
No. The £12,570 Personal Allowance and the National Insurance threshold are the same whatever hours you work, so you keep a bigger share of a part-time salary than of a full-time one.
What is £30,000 pro-rata for 3 days a week?
If full-time is 5 days, 3 days is 60%, so £18,000 a year. In England, Wales or Northern Ireland in 2026/27 that is about £16,480 a year, or £1,373 a month, after £1,086 Income Tax and £434.40 National Insurance (no pension or student loan).
Do bank holidays count towards part-time holiday?
GOV.UK says an employer can include bank holidays as part of statutory annual leave, and bank holidays do not have to be given as paid leave on top. Check your contract.
Method & sources
- Calculation: pro-rata salary = full-time salary × your share of hours (or days); take-home for both from
thCompute, the engine behind our take-home pay calculator (whole-year basis, tax code 1257L, NI category A). - Holiday: 5.6 weeks, the 3 days → 16.8 days example, 28-day limit, bank holidays: GOV.UK — gov.uk/holiday-entitlement-rights.
- Income Tax rates, bands and Personal Allowance 2026 to 2027: GOV.UK — gov.uk/income-tax-rates.
- Employee National Insurance rates 2026 to 2027: GOV.UK — gov.uk/national-insurance-rates-letters; yearly thresholds and student loan thresholds: HMRC — rates and thresholds for employers 2026 to 2027.
- All sources checked 18 October 2026. Verification: automated tests, run before every update, check the results against hand-worked examples and confirm every tax and National Insurance figure comes from the same tested engine as our take-home pay calculator.
- Reviewed: .
Educational estimate only, not personal financial, tax or employment advice. Your contract decides how pay and holiday are pro-rated. Rules can change; confirm with GOV.UK, ACAS or your employer.
Run your own numbers
Enter the full-time salary and your hours to see your pro-rata pay and holiday.
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