Pro-Rata Salary Calculator
Convert a full-time salary into pro-rata part-time pay based on the hours you actually work. See your annual, monthly, weekly and hourly figures instantly — perfect for part-time and term-time roles.
Pro-rata salary calculator
Convert full-time pay into your part-time equivalent.
Gross figures before tax. For take-home pay, deduct Income Tax and National Insurance.
What does pro-rata salary mean?
"Pro rata" is Latin for "in proportion". When a job is advertised at, say, £30,000 pro rata, that is the full-time salary — your actual pay is a proportion of it based on the hours or weeks you work. This calculator does the proportion for you and shows the annual, monthly, weekly and hourly result.
The formula is simple: your pay = full-time salary × (your hours ÷ full-time hours). If a £30,000 role is full-time at 37.5 hours and you work 22.5 hours, you'd earn 22.5 ÷ 37.5 = 60% of £30,000 = £18,000 a year.
How to work out pro-rata pay
There are two adjustments that can apply:
- Hours. Divide your contracted hours by the full-time hours for the role to get your "FTE" (full-time equivalent) fraction.
- Weeks. Term-time-only roles (common in schools) are also pro-rated for the weeks you actually work across the year, including paid holiday entitlement.
Our calculator handles both. Set "weeks per year" to 52 for a standard part-time job, or to the contracted number for term-time work.
Pro-rata and term-time work
Term-time staff are paid for the weeks they work plus their statutory holiday. This is why a teaching assistant's annual salary is lower than the headline full-time figure even at full hours — the weeks are pro-rated too. Always check whether an advertised salary is the full-time figure or the already-adjusted pro-rata amount.
Worth knowing. Part-time workers are legally entitled to the same hourly rate, pension access and pro-rata holiday as full-time colleagues under the Part-time Workers Regulations. If your pro-rata pay works out at a lower hourly rate than a full-timer, that may be unlawful.
This tool shows gross pay. To see what lands in your account, you'll also need to deduct Income Tax and National Insurance on the pro-rata figure.
Frequently asked questions
How do I calculate pro-rata salary?
Multiply the full-time salary by your hours divided by the full-time hours. For example, £30,000 × (22.5 ÷ 37.5) = £18,000. If you also work fewer weeks, multiply by your weeks ÷ 52.
What does '£30,000 pro rata' mean on a job advert?
It means £30,000 is the full-time salary. Your actual pay will be a proportion of it based on the part-time hours (and weeks) you work.
Is pro-rata salary before or after tax?
Pro-rata salary is a gross figure. Income Tax and National Insurance are then calculated on that reduced amount, so part-time earners often pay proportionally less tax.
How is term-time-only pay calculated?
Term-time pay is pro-rated for both hours and the weeks worked across the year (including paid holiday). That's why term-time annual pay is below the headline full-time figure.
Do part-time workers get the same hourly rate?
Yes. Under the Part-time Workers Regulations you are entitled to the same hourly pay rate and pro-rata benefits as a comparable full-time colleague.