Pro rata salary calculator
Turn a full-time salary into part-time pay — a year, a month, a week and an hour — with your holiday entitlement in hours and what you take home.
Part-time pay from a full-time salary
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| Your pro rata salary | — |
|---|---|
| A month | — |
| A week | — |
| Hourly rate | — |
| Take-home a month (England, no pension or loan) | — |
| Holiday entitlement | — |
Figures reviewed: July 2026, for the 2026/27 tax year. Thresholds change every April — if you are reading this later, check gov.uk/income-tax-rates.
How pro rata pay is worked out
Pro rata means "in proportion". A part-time salary is the full-time salary multiplied by the share of full-time hours you work:
Pro rata salary = full-time salary × (your hours ÷ full-time hours)
On a £32,000 full-time salary for a 37.5-hour week, 22.5 hours is 60% of the hours, so the pro rata salary is £19,200 — £1,600 a month before tax, at the same hourly rate (£16.41) as a full-timer. If the advert says "£32,000 pro rata", that £32,000 is the full-time equivalent, not what you will be paid.
Holiday is pro rata too
The statutory minimum is 5.6 weeks of paid holiday a year, which is 28 days for someone working five days a week and can include the eight bank holidays. A part-timer gets the same 5.6 weeks of their own working pattern. Working it out in days goes wrong as soon as the days are uneven, so the calculator gives it in hours: full-time holiday hours × your fraction. Someone on 22.5 hours against a 37.5-hour full-time week with 28 days' leave gets 126 hours — about 16.8 of their 7.5-hour days.
Bank holidays are the usual catch. If they are included in the 28 days, a part-timer who never works Mondays must still receive their proportionate share as leave on other days, not simply lose them.
Take-home pay is not pro rata
Tax is the one thing that does not scale in proportion. The personal allowance (£12,570 in 2026/27) and the National Insurance threshold are fixed amounts, so a part-timer keeps a larger share of their pay than a full-timer on the same hourly rate. On £19,200 the take-home is about £1,445 a month — 90% of gross — whereas the full-timer on £32,000 keeps about 83%. The calculator's take-home line uses the same engine as our take-home pay calculator, for England with no pension or student loan; use that page for Scotland, pensions and loans.
Term-time and compressed hours
Term-time contracts are pro rata by weeks as well as hours: a 39-week year against a 52-week full-time year is a further 75% factor, usually with the holiday element folded in and the pay spread over twelve months. Compressed hours — full-time hours in four days — are full-time pay: the fraction is 1, and only the holiday needs converting to hours.
Common questions
How do I calculate a pro rata salary?
Multiply the full-time salary by your hours divided by the full-time hours. £32,000 full-time for 37.5 hours a week, at 22.5 hours, is £32,000 × 22.5 ÷ 37.5 = £19,200.
What does '£30,000 pro rata' mean in a job advert?
That £30,000 is the full-time equivalent salary. If the job is part-time you will be paid the proportion that your hours are of full-time hours — for example £18,000 for a 3-day week against a 5-day full-time week.
How is part-time holiday entitlement calculated?
Part-timers get the same 5.6 weeks as full-timers, in their own working pattern. Work it out in hours: full-time holiday days × hours per day × your fraction of full-time hours. Bank holidays included in the full-time allowance must be shared proportionately.
Is my hourly rate lower if I work part-time?
No — pro rata means the hourly rate is identical. What changes is the number of hours, so the annual and monthly pay are proportionate.
Does tax go down in proportion if I go part-time?
It goes down by more than proportionately, because the personal allowance and NI threshold are fixed amounts. A part-timer keeps a larger share of gross pay than a full-timer on the same hourly rate.
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