Convert a full-time salary into your pro rata salary based on the days or hours you work.
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What this calculator covers and how the numbers are worked out
Part-time and job-share roles are almost always advertised using a full-time-equivalent salary. Pro rata simply means 'in proportion' - your actual pay is the full-time salary scaled down to match the share of full-time hours or days you actually work. This calculator does that scaling for you.
The calculation itself is straightforward: pro rata salary equals the full-time salary multiplied by your hours or days divided by full-time hours or days. Enter the full-time salary, the full-time hours or days in a normal week, and the hours or days you'll actually work, and it returns your yearly, monthly and weekly pay at that proportion.
Take a full-time salary of £33,000 advertised for a five-day week, for a role you'll do three days a week. Your proportion is 3 divided by 5, or 0.6, so your pro rata salary is £33,000 x 0.6 = £19,800 a year, which works out at £1,650 a month.
The same works with hours instead of days - if the full-time week is 37.5 hours and you work 22.5 hours, that's again 22.5 divided by 37.5 = 0.6 of full-time, giving the identical £19,800 pro rata salary for the £33,000 role. Use whichever measure - hours or days - matches how your contract actually describes your working pattern.
By law, part-time workers get the same holiday entitlement, pension rights, sick pay and other statutory benefits as a full-time employee doing the same job, just in the same proportion as their hours - so someone working 0.6 of full-time hours is entitled to 0.6 of the standard holiday allowance, not a smaller share on top of that.
The figure this calculator produces is gross pro rata pay, before any income tax, National Insurance, pension or student loan deductions. Put the result into the salary calculator or after-tax calculator to see what you'd actually take home from a part-time role.
Watch out for roles that quote an hourly or daily rate rather than a pro rata annual salary - the two aren't always equivalent, because a daily rate sometimes already accounts for the fact that contractors don't get paid holiday, while an employee's pro rata salary should. Always check whether a quoted figure already includes holiday pay before comparing offers.
Pro rata calculations also come up outside part-time jobs - for example, working out pay for someone who joins or leaves partway through the year, or comparing a job that pays term-time only against one that pays for the full 52 weeks. In each case the same underlying idea applies: scale the full-time-equivalent figure down by whatever proportion of the full period you're actually being paid for, whether that's measured in days, weeks or hours.
Full-time salary multiplied by the proportion of full-time hours or days you work - for example, a £33,000 full-time salary at 3 days out of a 5-day week gives £33,000 x (3/5) = £19,800 a year.
Yes - enter the full-time hours in a normal week and your own weekly hours, and the calculator applies the same proportion; 22.5 hours out of a 37.5-hour full-time week gives the same 0.6 proportion as 3 days out of 5.
It's gross pay, before income tax, National Insurance and any other deductions - use the salary or after-tax calculator with the pro rata figure to see your take-home pay.
Not proportionally less than their hours - by law, part-time staff get the same holiday entitlement as a full-time employee in the same role, scaled to their working pattern, so 0.6 of full-time hours means 0.6 of the standard holiday entitlement.
Use your average hours over a representative period, such as a typical four-week cycle, as your input, since the calculator assumes a consistent weekly pattern.
Workplace pension contributions are usually calculated as a percentage of your actual pro rata pay, not the full-time-equivalent salary, so your contributions and any employer match also scale down in proportion to your hours.
Not always - a quoted day rate for contract or freelance work often doesn't include paid holiday, whereas an employee's pro rata salary should, so compare carefully before assuming two offers are equivalent.
Work out the pro rata equivalent of the full-time-equivalent salary at your intended hours, then compare that figure - along with pro rata holiday and any benefits - against the actual salary offered for the part-time role.
Yes - the same principle applies, scaling your annual salary by the proportion of the year you actually worked, so someone on a £33,000 role who works exactly half the tax year would typically be paid £16,500 for that year.
These results are estimates for general guidance and are not financial advice. Always confirm important figures with an official source.
Rates last reviewed: 2 October 2026 · Built around the 2026/27 UK tax year
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