Salary Checker Pro Rata

Check Your Pro Rata Salary Is Correct

This salary checker verifies whether your employer has calculated your pro rata pay correctly. Enter the full-time salary for your role, the standard hours, and your contracted hours. Compare the result with your payslip to confirm accuracy.

Payroll errors affecting part-time workers are more common than employers admit. A 2023 CIPD survey found that 12% of part-time employees had experienced at least one pay discrepancy in the previous year, often due to incorrect base hours being used in the pro rata formula.

Common Salary Calculation Errors

• Wrong base hours: Using 40 instead of 37.5 as full-time hours inflates your pro rata — but you're actually paid less per hour than colleagues. Check your organisation's HR policy.
• Forgetting annual increments: If full-time colleagues received a pay rise, your pro rata should increase by the same percentage.
• Holiday calculation errors: Your holiday should be 5.6 × your working days per week. Employers sometimes calculate this incorrectly. Verify with our holiday pay calculator.
• Pension contribution mistakes: Auto-enrolment should be based on your actual (pro rata) salary, not the full-time equivalent.

What to Do If Your Pay Is Wrong

First, calculate the correct figure using this checker. Then raise it informally with your line manager or payroll department, providing your workings. If unresolved, submit a formal grievance citing the Part-time Workers Regulations 2000. You can also contact ACAS on 0300 123 1100 for free advice. As a last resort, you may take a claim to an employment tribunal within three months of the pay discrepancy.

How to Use the Salary Checker Pro Rata

Using our salary checker pro rata is straightforward. Follow these steps to get accurate results for your situation:

1. Enter your full-time salary — This is the annual salary for the equivalent full-time role, before any deductions. You'll find this on the job advert or your contract.
2. Set the full-time hours — The standard working week for the role. Most UK employers use 37.5 or 40 hours per week.
3. Enter your actual hours — Your contracted weekly hours. This is the number you actually work.
4. Click Calculate — The salary checker pro rata displays your results instantly, with annual, monthly, weekly, daily, and hourly breakdowns.

Worked Example: Salary Checker Pro Rata

Let's work through a practical example of salary checker pro rata. A marketing coordinator role advertises a full-time salary of £28,000 for 37.5 hours per week. You're offered the position at 25 hours per week.

Step 1 — Find your FTE ratio: 25 ÷ 37.5 = 0.667 (66.7%)

Step 2 — Calculate pro rata salary: £28,000 × 0.667 = £18,667 per year

Step 3 — Monthly breakdown: £18,667 ÷ 12 = £1,556 gross per month

Step 4 — Holiday entitlement: 28 days × 0.667 = 18.7 days pro rata

After income tax and NI (2025/26 rates), your monthly take-home would be approximately £1,377. Use our pro rata calculator above to check your own figures.

Tips for Using This Calculator

• Always use gross salary: Enter the salary before tax and deductions — the calculator works with gross figures.
• Check your contract: Your employment contract should state your full-time equivalent hours. Common UK standards are 35, 37, 37.5, and 40 hours per week.
• Know your rights: Under the Part-time Workers Regulations 2000, part-time employees must receive the same hourly rate, holiday entitlement (pro rata), and benefits as full-time colleagues.
• Tax personal allowance: For 2025/26, the first £12,570 of earnings is tax-free. If your pro rata salary falls below this, you pay no income tax at all.
• National Insurance: Employee NI is 8% on earnings between £12,570 and £50,270 (2025/26 rates). Check HMRC NI rates for the latest figures.

Pro Rata Holiday Entitlement

Under the Working Time Regulations 1998, all UK workers are entitled to a minimum of 5.6 weeks' paid holiday per year (28 days for full-time). If you work part-time, your entitlement is calculated pro rata based on your actual hours or days worked.

Holiday entitlement is always rounded up — never down — when the result is not a whole number, per ACAS guidance on holiday entitlement. Bank holidays may be included in or added on top of your statutory 28 days, depending on your contract.

Related Salary Calculators

Our salary checker pro rata is just one of the tools available on ProRataCalculator. You may also find these useful: term-time salary calculator, overtime calculator, holiday pay guide.

Last updated: February 2026. Verified against HMRC 2025/26 tax rates and April 2025 National Living Wage (£12.21/hour).