Pro Rata Salary Calculator
Thinking of reducing your hours, or starting a part-time role advertised as "£30,000 pro rata"? Enter the full-time salary and your hours — see your actual salary, take-home pay and holiday entitlement.
What does "pro rata" actually mean?
Pro rata is Latin for "in proportion". If a job pays £35,000 full-time (37.5 hours) and you work 22.5 hours, your pro-rata salary is £35,000 × (22.5 ÷ 37.5) = £21,000. The same proportion applies to holiday: the statutory minimum of 28 days (5.6 weeks) becomes 16.8 days at three days a week. Pension, tax and National Insurance are then worked out on your actual pro-rata pay — which is why your take-home is often a bigger share of your salary than a full-timer's: more of it sits inside the tax-free personal allowance.
Pro rata questions
How do I calculate my pro-rata salary?
Divide your hours by the full-time hours, then multiply the full-time salary by that fraction. Example: £30,000 full-time at 40 hours, you work 24 hours → 24 ÷ 40 = 0.6 → £18,000.
How much holiday do part-time workers get?
The statutory minimum is 5.6 weeks including bank holidays, pro-rata. Work 3 days a week and that's 16.8 days a year. Your employer can give more, and many public-sector schemes do.
Do I pay less tax working part-time?
You pay the same rates, but on a lower salary — so a larger share of your pay falls within the £12,570 tax-free personal allowance, and your overall deduction percentage is usually lower than a full-time colleague's.
Is pro rata the same as part-time?
Almost — "part-time" describes the job; "pro rata" describes how the pay and benefits are scaled down from the full-time equivalent. A part-time job's salary is nearly always quoted either as the actual amount or as "full-time salary, pro rata".