Pro-Rata Salary Calculator
Calculate your part-time or part-year salary based on a full-time equivalent
Common Questions
What does pro-rata mean?
Pro-rata is Latin for "in proportion." Applied to salaries, it means scaling a full-time salary down to match the proportion of time you actually work. If a job pays £40,000 full-time (37.5 hrs/week) and you work 25 hours, your pro-rata salary is £40,000 × (25 ÷ 37.5) = £26,667.
Do part-time workers have the same rights as full-time?
Yes. Under the Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000, part-time employees cannot be treated less favourably than comparable full-time workers unless objectively justified. This includes pay rates, pension access, holiday entitlement, and training — all of which must be provided on a pro-rata basis.
How does pro-rata affect my pension contributions?
Auto-enrolment pension contributions are based on your qualifying earnings, not your FTE salary. If your actual annual earnings fall between £6,240 and £50,270, you'll be auto-enrolled and contribute on those earnings. Your employer also contributes on the same basis. A lower pro-rata salary means lower absolute contributions but the same percentage rates apply.
What is an FTE salary?
FTE (Full-Time Equivalent) salary is the salary the role would pay if worked full time. Job adverts often quote "£30,000 FTE" for a part-time role so that candidates can compare it with other roles. Your actual salary will be lower, proportional to the hours you work.
Enter your FTE salary and working pattern to calculate your pro-rata pay.
Quick Reference
- 4 days/5 = 80% of FTE
- 3 days/5 = 60% of FTE
- 30 hrs/37.5 = 80% of FTE
- 25 hrs/37.5 = 66.7% of FTE
- 20 hrs/37.5 = 53.3% of FTE
Related Calculators
What's included in this calculator
Convert part-time salary to Full Time Equivalent.
Accurately scales leave based on hours worked.
See how reduced hours affect your tax bands.
Logic for auto-enrolment on pro-rata earnings.
Supports 1-5 days or custom weekly hours.
Uses the latest income tax and NI thresholds.
How to Calculate a Pro-Rata Salary
A pro-rata salary is calculated by dividing the full-time equivalent (FTE) salary by the number of full-time hours or days, then multiplying by the hours or days you actually work. The formula is straightforward: Pro-rata salary = FTE salary × (actual hours ÷ full-time hours). This applies equally to weekly hours comparisons and to part-year working arrangements such as term-time only roles.
Job adverts in the UK often display salaries as "£X,000 FTE" or "£X,000 pro rata" for part-time roles. This allows candidates to make fair comparisons. Your actual salary will always be lower, reflecting the proportion of full-time hours you will work. When comparing job offers, always check whether the figure quoted is FTE or actual — it makes a significant difference.
Part-time workers in the UK have the same rights as full-time workers on a pro-rata basis, including annual leave (minimum 5.6 weeks), pension auto-enrolment, and statutory pay. Employers cannot offer less favourable terms to part-time staff unless there is a clear objective justification.