Guide
Part-Time Pro Rata Pay UK: Working Out a 3-Day Week
Part-time pro rata pay scales a full-time salary to your contracted working pattern. To calculate it with your own figures, use the UK pro rata salary calculator.
The core formula
full-time salary × your contracted time ÷ full-time contracted time
For three days out of five, the fraction is 3 ÷ 5 = 60%. A £30,000 full-time salary therefore becomes £30,000 × 60% = £18,000 gross a year.
Days or hours?
Use the comparison stated in your contract. Three equal days out of five and 22.5 hours out of 37.5 both equal 60%, but unequal working days can make the results differ. The part-time salary calculator lets you use the appropriate working-pattern figures.
Holiday, tax and pension
Part-time holiday entitlement is also commonly scaled to the working pattern. Bank holidays may be included within the stated entitlement, so check how your employer presents the allowance. Income Tax and National Insurance apply after the gross salary is calculated, while workplace pension contributions depend on the scheme and pensionable earnings.
If the issue concerns only an incomplete first or final month, use the part month salary calculator instead.
▲ Check your own figure
Plug your numbers into the UK pro rata salary calculator — it shows the full working, so you can see exactly which days were counted.