HomePro-Rata Salary Calculator

Pro-Rata Salary
Calculator 2026/27

Find out what a full-time salary pays for the hours you actually work, or for part of the year. You also see your monthly pay, hourly rate and an estimate of your take-home pay.

Tax year 2026/27
The yearly salary for the job if worked full time
Leave blank for 37.5
Leave blank for a full year (52 weeks). Use this for a fixed-term or part-year job.

How pro-rata pay works

Pro rata means "in proportion". When a job is advertised as "£30,000 pro rata", £30,000 is what you would earn working full time. If you work fewer hours, you get the same share of that salary as the share of full-time hours you work. You can read more in our glossary entry on pro rata.

The calculator works it out like this:

Worked example

A job pays £30,000 for a full-time week of 37.5 hours. You work 22.5 hours a week, all year. 22.5 ÷ 37.5 is 0.6, so you earn 60% of the full-time salary: £30,000 × 0.6 = £18,000 a year, or £1,500 a month. Your hourly rate is £30,000 ÷ (37.5 × 52) = £15.38, the same as a full-time worker.

On £18,000 in England, Wales or Northern Ireland, with tax code 1257L, the first £12,570 is your Personal Allowance and is tax-free. Income tax is 20% of the remaining £5,430, which is £1,086. National Insurance is 8% of the same £5,430, which is £434.40. Your estimated take-home pay is £16,479.60 a year, about £1,373.30 a month.

Working part of the year

If a job runs for only part of the year, such as a 26-week fixed-term contract, enter the weeks you will work. The salary is scaled down by weeks ÷ 52. The take-home estimate treats this as your only pay for the tax year, so if you have other earnings in the same year your tax will be higher than shown.

Term-time only jobs

Many school jobs are paid for term time plus holiday, not all 52 weeks. Tick term-time only and enter the weeks you work, for example 39. Part-year workers build up paid holiday at 12.07% of the hours they work (for leave years starting on or after 1 April 2024), which is about 4.7 weeks on top of 39 weeks. If your contract gives more holiday, enter your own figure. Your pay is then the full-time salary × (your hours ÷ full-time hours) × (weeks worked plus holiday weeks ÷ 52).

Holiday is pro rata too

Almost all workers get 5.6 weeks of paid holiday a year. If you work part time, your holiday is worked out the same way as your pay: 5.6 times the days you work each week. Use our holiday entitlement calculator to check yours.

Related calculators

See your full take-home pay with pension and student loan using the take home pay calculator. Check how much paid leave you get with the holiday entitlement calculator. Turn a salary into an hourly figure with the salary to hourly calculator, or go the other way with the hourly to salary calculator. Make sure your hourly rate is legal with the minimum wage calculator.

How this is worked out

We multiply the full-time salary by your hours (or days) as a share of full time, then by the weeks you are paid for as a share of 52. Take-home pay is then estimated with the same income tax, National Insurance, pension and student loan rules as our take home pay calculator. Statutory holiday is 5.6 weeks of your working pattern, or 12.07% of the hours you work for term-time only jobs.

What this calculator assumes

  • Tax year 2026/27, using England, Wales and Northern Ireland rates, or Scottish income tax rates if you choose Scotland.
  • Full-time hours are 37.5 a week, full-time days are 5 and weeks worked are 52 if you leave those fields blank. Comparing by days keeps the same hourly rate as full time.
  • Term-time only: you are paid for the weeks you work plus paid holiday. If you leave the holiday blank we use 12.07% of the weeks you work, the legal minimum for part-year workers.
  • Holiday for a full year is 5.6 weeks of your hours, or 5.6 times your days a week up to 28 days. For other part-year jobs we do not show a holiday figure.
  • Take-home uses tax code 1257L (or your own under More options), employee National Insurance (category A), and no other income. Pension and student loan are included only if you add them under More options. A Postgraduate Loan is 6% of pay above £21,000. Over State Pension age, no employee National Insurance is taken.
  • The pro-rata salary is treated as your total pay for the tax year.
  • Results are rounded to the nearest penny for display.

Sources

Rates checked against GOV.UK on 12 October 2026. Read how we calculate or tell us about a mistake.

Frequently asked questions

Pro rata means in proportion. A job advertised at £30,000 pro rata pays £30,000 for full-time hours, and you get a share of that based on the hours you work. At 22.5 hours a week against a full-time week of 37.5 hours, you would earn 60%, which is £18,000 a year.

No. A pro-rata salary keeps the same hourly rate as the full-time job. You are paid for fewer hours, so the yearly total is lower, but each hour is worth the same.

Multiply the yearly salary by the number of weeks you work and divide by 52. For example, a £30,000 full-time job worked for 26 weeks pays £15,000. Enter the weeks in the optional weeks field of the calculator.

Part-time workers pay tax and National Insurance on the same rules as everyone else. Because the yearly pay is lower, more of it can fall within the £12,570 Personal Allowance, so a smaller share goes in tax. On £18,000 in England the estimate is £1,086 income tax and £434.40 National Insurance.

Yes. Almost all workers get 5.6 weeks of paid holiday a year, so a part-time worker gets 5.6 times the days they work each week. Someone working 3 days a week gets 16.8 days. Our holiday entitlement calculator works it out for you.