Pro Rata Salary Calculator
Pro Rata Calculator UK makes it simple to work out part-time salary, holiday entitlement, and pension contributions accurately.
Pro-rata Holiday (UK statutory)
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How to use the Pro-Rata Calculator
The Pro Rata Calculator is a simple way to work out part-time pay, holiday entitlement, and pension contributions in the UK. It adjusts a full-time salary to match the actual hours worked, giving you an accurate figure every time.
To use the calculator:
Enter the full-time annual salary.
Add the standard weekly hours for a full-time role.
Enter the number of hours worked part-time.
(Optional) Include a pension contribution percentage.
If National Insurance doesn’t apply, just tick the box.
Once the details are entered, the Pro Rata Salary Calculator UK will instantly show the adjusted salary in the blue results box. The calculation is based on the ratio of part-time to full-time hours, so as long as your inputs are correct, your pro rata pay will be accurate.
This makes the Pro Rata Pay Calculator useful for both employers checking staff wages and employees confirming their part-time salary.
For more on statutory holiday entitlement, visit
GOV.UK holiday entitlement.
Helpful Guides
What is a pro rata basis?
“Proportional rate” is shortened to “pro rata.” In payroll, it refers to how part-time workers are paid based on their hours compared to full-time workers.
Full-time employees usually get a fixed yearly salary. Part-time workers also receive salaries, but their pay is pro rata, meaning it is adjusted for the fewer hours they work.
It’s important to note that pro rata pay is only for part-time workers. Typically, temporary employees, contractors, or freelancers do not receive pro rata compensation.
How to Calculate Pro Rata Salary?
Here is a breakdown to help you understand and calculate your employees’ pro rata salary on your own, even though our calculator tool makes it easy. First, find the full-time equivalent salary and divide it by 52 weeks. Then, divide that result by the number of full-time hours worked per week at your company, such as 37.5 out of 40. This will give you your hourly rate. Next, multiply this figure by the actual number of working hours per week (the pro rata hours per week).
Once you have this number, multiply it by 52 to get the annual pro rata salary. To find the actual amount, you need to consider several additional factors, including national insurance. To make things a bit easier, our pro rata salary calculator does all the math for you.
How to Work Out Pro Rata Holiday?
1. To start, a full-time worker in the UK who works five days a week is entitled to 5.6 weeks of vacation time each year, which includes 28 days for bank holidays.
2. Check the working days of your part-time employee. Find out how many days a week they usually work, like three or four.
3. Do the math. To figure out their annual holiday allowance, multiply the number of days they work each week by 5.6.
Four times a week: 4 × 5.6 = 22. Four days off.
Three days a week: 3 × 5.6 = 16.8 vacation days.
4. Round if needed. Some employers round to the nearest half-day or full day. If you choose to do this, make sure it’s fair and consistent for all employees.
5. Double-check compliance. Always ensure the entitlement you calculated matches their working pattern and meets the legal minimum. It’s better to verify than risk giving too little leave.
6. Use Blaze HR’s calculator. If you want to avoid the math, Blaze HR’s holiday entitlement calculator determines it quickly, saving time and ensuring accuracy.
Is Part-Time Employment Right Fit for Your Business?
It’s important to think about whether moving someone to part-time hours or hiring them on a pro rata basis is the best choice for your business.
Part-time jobs can lower benefit-related expenses, increase employee flexibility, and save on payroll costs.
However, there are drawbacks. These include higher employee turnover, differences between full-time and part-time workers, and sometimes a drop in engagement with the company culture.
To ensure part-time workers feel as valued and committed as your full-time staff, you need to integrate them effectively. You have the final decision, but be sure their pay and paid time off are set fairly and accurately.
Payroll Made Easy with Blaze HR
Payroll management doesn’t have to be hard. Blaze HR keeps all your employee and pay information in one secure place, ready for payday.
You can export payroll data instantly, review employee records quickly, and ensure everything is correct and meets regulations.
Blaze HR makes payroll faster, simpler, and less stressful.
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Start your free trial of Blaze HR and see how easy it is to save time, cut down admin, and give your team the tools they need to perform at their best.
Frequently asked questions
What is a pro rata basis?
When someone is paid on a pro rata basis, their salary and benefits are worked out in proportion to the hours they work compared with a full-time contract. In simple terms, you only get paid for the share of hours you actually work.
So, if a full-time role pays £30,000 a year for 37.5 hours a week, but you only work half those hours, you’d earn around £15,000. This way of calculating pay makes sure part-time employees are treated fairly and consistently.
It’s important to note that pro rata pay is usually linked to salaried part-time roles. Freelancers, agency workers, and contractors are generally paid differently, so pro rata rules don’t apply to them.
If you’re not confident doing the sums yourself, our Pro Rata Calculator can quickly show you the correct salary based on your hours.
Are bank holidays included in pro rata holiday entitlement?
Bank holidays may be included in pro rata holiday entitlement depending on company policy. If full-time staff receive bank holidays, part-time employees should get a proportional allowance.
Who is eligible for pro rata pay?
Part-time employees are eligible for pro rata pay, while freelancers and temporary staff usually are not.
How to work out pro rata holiday
Along with salary, part-time employees are entitled to pro rata holiday based on their hours. Ensuring accurate leave entitlement is essential, as mistakes can lead to legal issues. In the UK, full-time staff working five days a week receive a statutory minimum of 5.6 weeks (28 days) paid holiday.
