Pro Rata Calculator UK – Salary, Holiday, Rent
Pro rata salary
£21,000
£35,000 ÷ 37.5 × 22.5
If a job is advertised at a full-time salary but you work fewer hours, your real pay is the pro rata amount, not the headline figure. This pro rata calculator UK works it out in seconds. Enter a full-time salary, holiday entitlement or monthly rent, add the hours or days you actually work, and you get the proportional amount straight away. It is free, built for the UK, and updated for the 2026/27 year. Use it to check a job offer, sense-check a payslip, work out part-time annual leave, or split rent for a part month. Most tools online only do salary. This pro rata salary calculator UK also covers holiday and rent from one place.
What Is a Pro Rata Calculator?
A pro rata calculator converts a full-time figure into the share you are owed for the hours, days or part of a period you actually work. Pro rata is Latin for "in proportion", so the maths is always the same. Take the full amount, divide it by the standard full-time hours, and multiply by your own hours. That one formula covers a pro rata salary, holiday entitlement, a pension, a bonus or part-month rent. Enter your pro rata hours or days, and the tool returns the result. It calculates pay based on hours worked, then shows the working so you can see exactly how the number was reached.
How Does Pro Rata Salary Calculate in the UK?
In the UK, jobs are usually advertised as a full-time equivalent salary, often based on 37.5 standard full-time hours per week, though 35 and 40-hour weeks are common too. To calculate pro rata pay, you compare your hours with full-time hours and apply that ratio to the salary. The formula is:
Pro rata salary = (full-time salary ÷ full-time hours) × your hours
Say a role pays £35,000 for a 37.5-hour week and you work 22.5 hours. That is £35,000 ÷ 37.5 × 22.5 = £21,000. Because 22.5 hours is 60% of a 37.5-hour week, your pro rata salary would be 60% of the full-time figure. Always check the contract for the standard full-time hours your employer uses, since a 40-hour baseline gives a different answer to a 37.5-hour one.
Pro Rata Salary Calculator for Part-Time Workers
Most people reaching for a pro rata salary calculator are part-time workers checking what a job actually pays. Part-time workers are paid a proportion of the full-time salary, set by the hours or days they work against standard full-time hours. The hourly rate does not change. A part-time employee on £28,000 full-time for a 35-hour week earns the same hourly rate as a colleague on the full 35 hours, just fewer hours of it. Enter the full-time salary and your weekly hours, and the calculator returns the salary for part-time work instantly. That makes it easy to compare a part-time offer against your current role without working out the percentages by hand.
Calculate Pro Rata Pay from Full-Time Salary
To calculate pro rata pay from a full-time salary, you only need three things: the full-time salary, the standard full-time hours, and the number of hours you work. The calculator does the rest. Here is how common part-time hours convert at typical UK salaries, based on a five-day, 37.5-hour full-time week.
| Full-time salary | 3 days (60%) | 4 days (80%) |
|---|---|---|
| £25,000 | £15,000 | £20,000 |
| £30,000 | £18,000 | £24,000 |
| £35,000 | £21,000 | £28,000 |
| £40,000 | £24,000 | £32,000 |
| £50,000 | £30,000 | £40,000 |
How Pro-Rata Salary Is Calculated
If you would rather see how pro-rata salary is calculated by hand, here is the step-by-step method. You can work it out by hours or days, and both give the same answer.
By hours: divide the full-time salary by the standard full-time hours to get the hourly rate, then multiply by the hours you work. On £40,000 for a 40-hour week, the hourly rate is £19.23. Work 24 actual hours a week and your pro-rata salary is £19.23 × 24 × 52, roughly £24,000.
By days: some roles are easier to work out by the number of days. Divide the annual salary by 260 working days (5 days × 52 weeks) to get a daily rate, then multiply by the days you actually work.
One case people often get wrong is a mid-year start. If you join part-way through the year, your salary for that first year is also pro-rated. Take the annual salary, divide by 12, and multiply by the months left. Start a £30,000 role in October and you earn around £7,500 before the next April.
Calculate Pro Rata Salary and Annual Earnings
The pro rata figure is your gross annual salary for the hours you work. From there it helps to break it down. Divide the annual salary by 12 for monthly pay, by 52 for weekly, and use the hourly rate for shift planning. A £21,000 pro rata salary is £1,750 a month gross, or about £404 a week. Gross pay and take-home pay are not the same, though. Your take-home pay depends on Income Tax, National Insurance, pension contributions and any student loan, and those apply to the pro rata salary, not the full-time one. For an exact net figure, run the gross result through a dedicated take-home pay calculator or tax calculator.
Pro Rata Holiday Entitlement Calculator
Holiday works on the same proportional logic as pay, which is why salary and holiday entitlement are usually checked together. Under UK law, full-time workers get 5.6 weeks of paid annual leave a year, which is 28 days for a five-day week. Part-time staff get the same 5.6 weeks scaled to their days. The quickest way to use a pro rata holiday entitlement calculator is to multiply the days you work each week by 5.6. Someone on three days a week is entitled to 3 × 5.6 = 16.8 days. A four-day week gives 22.4 days. For irregular patterns, multiply your weekly hours by 5.6 to get pro rata holiday entitlement in hours instead. The holiday entitlement calculator handles both, and your employer can offer more than the statutory minimum but never less.
Holiday Entitlement and Bank Holidays Explained
Bank holidays cause more confusion than any other part of part-time leave. There is no legal right to take bank holidays off, and no rule that they must be paid on top of your 5.6 weeks. They can be counted as part of the statutory entitlement. The fair approach, and the one most employers use, is to give part-time workers a pro rata share of bank holidays rather than the full eight. England and Wales have eight bank holidays a year. A full-timer effectively gets all eight; a three-day-a-week worker should get 8 × (3 ÷ 5) = 4.8 days towards their allowance. Without this, anyone who never works a Monday would lose out on the Monday bank holidays, which is exactly what the pro rata basis is there to prevent. Check your contract, since how bank holidays are handled is set by company policy within those limits.
Who Is Eligible for Pro Rata Pay?
Pro rata pay applies to salaried employees who work fewer hours than a comparable full-time worker. That covers part-time staff, job sharers, term-time and part-year workers, and anyone joining or leaving part-way through a pay period. Term-time staff such as teaching assistants are a common example, since their pay reflects both reduced weekly hours and a working year shorter than 52 weeks. Freelancers, independent contractors and temporary workers paid by the hour or by invoice are not on a pro rata salary, because they are not salaried in the first place. Under UK employment law, part-time workers cannot be treated less favourably than full-time colleagues. They are entitled to the same hourly rate and the same access to pension, holiday and sick pay, all calculated on a pro rata basis.
Work Out Pro Rata Salary for Any Working Hours
The calculator is not limited to neat three or four-day weeks. Enter any working hours, against any full-time baseline, and it works out pro rata pay for that exact pattern, so it fits any salary and working pattern. This matters for one thing people misread: compressed hours. If you work full-time hours squeezed into fewer days, say 37.5 hours across four days instead of five, you are working 100% of the hours and compressed hours do not reduce your salary at all. Pro rata depends on total hours worked, not the number of days you spread them over. It also gives you a quick way to calculate your salary check: find the full-time equivalent salary in your contract, divide your actual hours by the standard full-time hours, and the result should match the percentage of your salary you receive. Enter your part-time hours or days, and if the figure does not line up, raise it with payroll.
What Does Pro Rata Mean in Employment?
In employment, pro rata means a salary, benefit or entitlement has been adjusted in proportion to the hours or days you work, rather than paid at the full amount. When a job advert lists a salary as pro rata, the figure shown is the equivalent salary for full-time work, and your real pay will be lower once it is scaled to your hours. The same principle runs through the rest of your package. Pension contributions, annual leave and bonuses are all worked out on a pro rata basis for part-time staff. So a pro rata salary is not a lower rate of pay. It is the full-time rate applied fairly to the hours you actually work, which is the whole point of having a pro rata calculator UK to hand.