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£18,000 pro rata: what you'll actually earn

£18,000 pro rata at 3 days a week is £10,800 a year, or £900.00 a month after tax and NI. At 4 days it's £14,400.

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hrs
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3 days of 7.5 hours = 22.5
Where you pay tax
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£18,000 pro rata by days and hours

PatternHoursPro rata salaryTake-home / monthPer day
4.5 days33.75£16,200£1,265.30£41.60
4 days30£14,400£1,157.30£38.05
3.5 days26.25£12,600£1,049.30£34.50
3 days22.5£10,800£900.00£29.59
2.5 days18.75£9,000£750.00£24.66
2 days15£7,200£600.00£19.73
1 day7.5£3,600£300.00£9.86
30 hours30£14,400£1,157.30£38.05
25 hours25£12,000£1,000.00£32.88
20 hours20£9,600£800.00£26.30
16 hours16£7,680£640.00£21.04

How to calculate pro rata salary

  1. Take the full-time salary in the advert.
  2. Divide your weekly hours by the full-time hours (often 37.5).
  3. Multiply the two. By days it's the same: salary × days ÷ 5.

"Pro rata" means the advertised figure is the full-time equivalent. You're paid your share of it, and you get the same share of holiday: 5.6 weeks a year, so 16.8 days if you work 3 days a week.

Full time, £18,000 takes home £1,373.30 a month. See £18,000 after tax →

Nearby salaries

Tax year 2026/27. An estimate for planning, not tax advice: your payslip can differ with tax codes, benefits, pension schemes and credits we don't model. Rates from the official source.

Questions

How much is £18,000 pro rata for 3 days?

£10,800 a year (3/5 of £18,000), or £900.00 a month after Income Tax and NI.

How much is £18,000 pro rata for 4 days?

£14,400 a year, or £1,157.30 a month after tax.

What is £18,000 pro rata for 20 hours?

£9,600 a year, if full time is 37.5 hours.

How much holiday do I get part-time?

5.6 weeks a year in proportion to your days: 16.8 days on 3 days a week, 22.4 on 4.

More free tools

Estimates for planning, not financial advice. Everything is calculated in your browser; nothing you type is sent anywhere. Updated 2026-10-29.