Salary Calculator Pro Rata
Compare full-time and part-time earnings side by side
📊 Salary Calculator Pro Rata
📋 Embed This Calculator
Add the calculator widget (no navigation, no ads) to your website or blog. Copy the code below:
Pro Rata Salary Calculator for UK Workers
This salary calculator converts full-time wages to pro rata equivalents for any working pattern. Whether you work fixed part-time hours, compressed weeks, or irregular shift patterns, the calculator gives you annual, monthly, weekly, and hourly salary breakdowns tailored to your situation.
Unlike generic salary tools, this calculator uses UK-specific parameters: the 2025/26 tax year thresholds, standard 37.5-hour full-time baseline, and 5.6-week statutory holiday calculations. Results are pre-tax gross figures.
Salary Comparisons Across Working Patterns
Comparing salaries across different working patterns requires converting everything to a common metric. The hourly rate is the fairest comparison point, as it removes variations in hours and shows the true value of each role.
| Role | Advertised | Hours | Hourly Rate |
|---|---|---|---|
| Office Admin (FT) | £24,000 | 37.5 | £12.31 |
| Office Admin (PT) | £14,400 pro rata | 22.5 | £12.31 |
| Retail Manager | £28,000 | 40 | £13.46 |
| NHS Band 4 | £26,530 | 37.5 | £13.60 |
Notice both admin roles have identical hourly rates despite different totals — this confirms the pro rata calculation is correct. Use our hourly rate converter for salary-to-hourly conversions.
What to Check on Your Pro Rata Payslip
Your payslip should show: gross monthly pay (annual pro rata ÷ 12), your tax code (usually 1257L for 2025/26), income tax deducted, employee NI contributions (8% on earnings between £12,570-£50,270), and any pension deductions. If any figure looks wrong, divide your gross monthly by your monthly hours — the hourly rate should match full-time colleagues.
How to Use the Salary Calculator Pro Rata
Using our salary calculator pro rata is straightforward. Follow these steps to get accurate results for your situation:
- 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.
- Set the full-time hours — The standard working week for the role. Most UK employers use 37.5 or 40 hours per week.
- Enter your actual hours — Your contracted weekly hours. This is the number you actually work.
- Click Calculate — The salary calculator pro rata displays your results instantly, with annual, monthly, weekly, daily, and hourly breakdowns.
Worked Example: Salary Calculator Pro Rata
Let's work through a practical example of salary calculator 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 salary calculator pro rata above to check your own figures.
Tips for Using This Calculator
- Always use gross salary: Enter the salary before tax and deductions — the salary calculator pro rata 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.
| Days Worked/Week | FTE Ratio | Statutory Days/Year | Bank Holidays (pro rata) |
|---|---|---|---|
| 5 days (full-time) | 1.0 | 28 days | 8 days |
| 4 days/week | 0.8 | 22.4 days | 6.4 days |
| 3 days/week | 0.6 | 16.8 days | 4.8 days |
| 2.5 days/week | 0.5 | 14 days | 4 days |
| 2 days/week | 0.4 | 11.2 days | 3.2 days |
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.
All calculations on this page follow ACAS pro rata pay guidelines and are consistent with the UK Employment Rights Act 1996. Tax figures use HMRC 2025/26 rates. The April 2025 National Living Wage of £12.21/hour is applied where relevant.
Related Salary Calculators
Our salary calculator 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).
Frequently Asked Questions
Pro rata means "in proportion." In employment, it refers to adjusting a full-time salary proportionally based on the number of hours, days, or weeks actually worked compared to a full-time equivalent role.
Divide the full-time salary by full-time hours, then multiply by your actual hours. For example: £30,000 ÷ 37.5 hours × 25 hours = £20,000 pro rata.
Pro rata salary is usually calculated before holiday pay. Your holiday entitlement is also pro-rated — part-time workers get 5.6 weeks holiday pro rata, calculated proportionally to hours worked.
Not exactly. Pro rata is the method used to calculate part-time salary. It ensures part-time workers receive the proportional equivalent of the full-time rate, maintaining fairness under UK employment law.