Pro Rata Salary Calculator UK

Enter the full time annual salary and the hours or days actually worked, and get the pro rata annual, monthly and weekly pay, with the FTE fraction shown.

Pro rata pay is the full time salary scaled down to the fraction of full time that you actually work. Pick hours or days, fill in the numbers, and the tool works out the FTE fraction and the pro rata pay for the year, the month and the week. All figures are gross, before tax and National Insurance.

Full time annual salary (£)

Full time hours / week

Hours you work / week

Worked examples. Full time 30,000 pounds, 3 days out of 5 (0.6 FTE): 18,000 pounds a year, 1,500 a month, about 346.15 a week. Full time 40,000 pounds, 25 hours out of 37.5 (0.667 FTE): 26,666.67 pounds a year, 2,222.22 a month, about 512.82 a week.

How pro rata pay works

Pro rata pay scales the full time salary by the fraction of full time worked. First work out the FTE fraction: hours worked divided by full time hours, or days worked divided by full time days. Then multiply the full time annual salary by that fraction. Monthly pay is the annual figure divided by 12, and weekly pay is the annual figure divided by 52. The hourly rate is the full time salary divided by full time hours times 52, and it stays the same whether you work full time or part time.

A note on holidays and benefits: part time staff in the UK get the same holiday entitlement pro rata, so 0.6 FTE of a 28 day allowance is 16.8 days. Pension and other benefits are usually worked out on the same pro rata basis. This tool covers pay only.

Check the full time figure first

The result is only as good as the full time salary and hours you enter. Check the job advert or contract: a 30,000 pound salary on a 37.5 hour week is not the same hourly rate as 30,000 pounds on a 40 hour week. Use the contract hours, not a guess.

Gross pay, not take home pay

Every figure on this page is gross pay before tax, National Insurance and pension. Tax bands and the personal allowance apply to your total income, so the take home figure needs a separate tax calculation.

Frequently Asked Questions

Pro rata means in proportion. If a full time job pays 30,000 pounds a year and you work 3 days out of 5, you work 0.6 of full time, so your pro rata salary is 18,000 pounds a year.

FTE means full time equivalent. It is the fraction of a full time job that you work. Someone working 18.75 hours in a 37.5 hour week is 0.5 FTE. Someone working the full 37.5 hours is 1.0 FTE.

Divide the days you work by the full time days, then multiply the full time salary by that fraction. For 3 days out of 5, the fraction is 3 divided by 5, which is 0.6.

Divide the hours you work by the full time hours, then multiply the full time salary by that fraction. For 25 hours out of 37.5, the fraction is 25 divided by 37.5, which is 0.667.

Use the hours in your contract or job advert. In the UK a common full time week is 37.5 hours, but some jobs use 35, 40 or 37 hours. This tool lets you set the full time hours yourself.

The tool still works it out and flags it. Working 45 hours in a 37.5 hour week is 1.2 FTE, so the pay would be 1.2 times the full time salary. In practice overtime is often paid at a different rate, so check your contract.

No. This tool works out gross pro rata pay before tax, National Insurance and pension. Use a take home pay calculator for the net figure.

Yes. Pro rata pay has its own rules, its own wording and its own worked examples, so it has its own page with its own calculator, rather than being a small option inside a general salary tool.

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