Why this site exists
Part-time and term-time work is ordinary — millions of people in the UK do it — but the pay arithmetic is rarely explained where it matters: on the job advert, the contract and the payslip. A salary described as “£30,000 pro rata” leaves the obvious question unanswered, and most calculators answer it with a bare number and no working behind it.
QuickProRata exists to show the working. Every calculator sets out the calculation in plain English, using your own figures, so you can follow each step, compare it with your contract, and see where a difference comes from if the numbers do not match.
What you will find here
The main pro rata calculator sits on the homepage. Dedicated pages go further: a salary calculator, a holiday calculator, a teacher calculator for term-time pay and a part-time calculator, plus rent, hourly rate and date calculators for part-period amounts. The FTE calculator converts between hours and FTE, the reverse calculator works out the hours behind a target salary, and the guides explain what pro rata means and how to work out pro rata salary by hand.
How the calculators work
The method throughout is the standard UK one. Pay and holiday scale with your fraction of the full-time week: your hours divided by the full-time hours, applied to the full-time figure. Holiday entitlement starts from the statutory minimum of 5.6 weeks a year and scales the same way; for irregular-hours and part-year workers, the calculators use the statutory 12.07% accrual method. Term-time pay uses the paid-weeks method that schools and councils use — term weeks plus holiday weeks, divided by 52. Take-home estimates then apply income tax and National Insurance on top of the gross figure.
Nothing is hidden. Each result shows the formula with your numbers in it, so the arithmetic can be checked on paper.
Rates and sources
The tax and National Insurance figures come from the rates published by HMRC on GOV.UK for the 2026/27 tax year, with Scottish income tax bands as published by the Scottish Government. Holiday guidance follows GOV.UK — holiday entitlement rights and ACAS — part-time workers. Where a calculation depends on a rate or a rule, the rate is stated on the page itself, next to the calculator, so you can see exactly what was assumed.
Keeping it current
Rates and rules change, usually each April. We review the site's rates, examples and explanations against the published figures and update pages when they change; the “last reviewed” date at the top of each page shows when it was last checked. If you spot something that looks out of date, please tell us — corrections are genuinely welcome, and the contact page explains what to send.
What we do not do
QuickProRata is an information site, not an advice service. We cannot tell you what your pay should be, check your personal payslip, or act for you in a dispute with an employer. For help with your own situation, ACAS and Citizens Advice offer free, impartial advice. Our Disclaimer sets out the limits of the figures in more detail.