Pro-rata salary calculator
Going part-time? Scale any full-time salary down to your actual hours and see your pro-rata annual and monthly pay instantly. This is an educational estimate, not legal advice.
How pro-rata salary works
When a role is advertised at a full-time salary "pro-rata", the figure you actually earn depends on the hours you work. Pro-rata simply means "in proportion": you take the share of the full-time salary that matches your hours. This calculator does that in one step — divide your hours by the full-time week, multiply by the full-time salary, and you have your annual and monthly pay.
The figure that trips people up is the full-time hours baseline. A £50,000 salary pro-rata across a 40-hour week gives a different result from the same salary across a 35-hour week, because in the shorter week each of your hours represents a larger slice of the whole. Always use the full-time standard your employer actually applies, which you will find in the contract or job advert. The same proportional logic extends beyond pay: holiday, bonuses and pension are typically pro-rata too, and part-time staff are legally entitled to the same benefits on that basis as comparable full-time colleagues.
All the figures here are gross, before tax — your take-home will be lower once deductions come off the reduced salary. Download the PDF summary to keep a record of the calculation when comparing a part-time offer or agreeing new hours.
Frequently asked questions
How do I calculate a pro-rata salary?+−
Divide your weekly hours by the full-time hours, then multiply by the full-time salary. Working 24 hours against a 40-hour full-time week on £50,000 gives 24 ÷ 40 × £50,000 = £30,000.
What does pro-rata mean for salary?+−
Pro-rata means 'in proportion'. A job advertised at a full-time salary 'pro-rata' pays you the share that matches your hours, so part-time staff are paid fairly relative to full-time colleagues.
Is a pro-rata salary before or after tax?+−
This calculator shows the gross pro-rata figure, before tax. Your take-home will be lower once income tax and other deductions are applied to the reduced salary.
Do part-time workers get pro-rata holiday too?+−
Yes. Holiday entitlement is also pro-rata: you get the same number of weeks as a full-time worker, which translates to fewer days because your week is shorter.
How is pro-rata pay worked out for benefits?+−
Many benefits — bonuses, pension contributions, allowances — are also scaled to your hours. Part-time workers are legally entitled to the same benefits, pro-rata, as comparable full-time staff.
Does the full-time hours figure matter?+−
Yes, a lot. The same salary against a 35-hour full-time week gives a higher pro-rata figure than against 40 hours, because each of your hours represents a bigger share. Always use your employer's full-time standard.
Legal basis and primary sources
All statutory figures are sourced directly from official government legislation and guidance. See our methodology →