Pro-rata salary calculator
Scale a full-time salary to your part-time hours — your pro-rata annual and monthly pay, in seconds.
Your pro-rata annual salary
- Full-time salary
- £50,000
- Full-time hours
- 40 hrs/week
- Your hours
- 24 hrs/week
- Pro-rata fraction
- 60%
- Your salary
- £30,000
- Monthly (gross)
- £2,500
- All figures are gross, before tax and deductions.
- Part-time workers are entitled to the same pay and benefits, pro-rata, as comparable full-time staff.
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.
Source: GOV.UK — Part-time workers' rights