Pro Rata Salary Calculator
Enter the full-time salary and the hours or days you work. See your pro rata annual, monthly, weekly and hourly pay.
Your pro rata salary
£24,000.00
£2,000.00 a month, 80% of the full-time salary
Monthly
£2,000.00
Weekly
£461.54
Hourly rate
£15.38
£6,000.00 less a year than the full-time salary
£15.38 an hour at 37.5 hours and at 30 hours a week.
Pay and time scale together, so the rate stays the same. That is this calculator's arithmetic, not a legal test.
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What does pro rata mean?
Pro rata means in proportion. A pro rata salary is the full-time salary scaled to the hours you actually work.
GOV.UK describes it this way: some benefits are applied “pro rata” (in proportion to hours worked). Acas defines it the same way: “Pro rata means in proportion to hours worked.”
How to work out a pro rata salary
- Start with the full-time salary for the role, and the hours (or days) a full-time week holds.
- Divide the hours you work by the full-time hours. 30 ÷ 37.5 = 0.8, or 80%.
- Multiply the full-time salary by that fraction. £30,000.00 × 0.8 = £24,000.00.
Multiply first and divide last (£30,000.00 × 30 ÷ 37.5) and you get the same £24,000.00 without rounding the fraction along the way.
Shorter weeks, worked out
The same sum for a £30,000.00 full-time salary on a 5-day week, paid over 52 weeks. These figures come from the calculator above.
| Days a week | Share of full time | Annual | Monthly | Weekly | Daily rate |
|---|---|---|---|---|---|
| 4 days | 80% | £24,000.00 | £2,000.00 | £461.54 | £115.38 |
| 3 days | 60% | £18,000.00 | £1,500.00 | £346.15 | £115.38 |
| 2 days | 40% | £12,000.00 | £1,000.00 | £230.77 | £115.38 |
Why the hourly rate does not change
Pay and hours move together, so dividing the pro rata salary by the hours you work gives the same figure as the full-time salary does: £15.38 an hour at 37.5 hours and at 30 hours. That is this calculator’s arithmetic, not a legal test.
What GOV.UK says is that part-time workers should get “the same treatment for” pay rates, among other things. Your contract sets the actual rate. See GOV.UK: part-time worker rights.
Holiday is pro rata too
This calculator does not work holiday out, and the figures here are GOV.UK’s, not ours. GOV.UK says almost all workers are entitled to 5.6 weeks’ paid holiday a year, and that statutory paid holiday is limited to 28 days. For someone working fewer days it gives this example: if they work 3 days a week, they must get at least 16.8 days’ leave a year (3 × 5.6).
Sources
Read on 8 October 2026. This is general information, not legal advice.
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