Pro Rata Salary Calculator UK 2025

Use our free pro rata salary calculator to work out your part-time salary from a full-time equivalent. Calculate pro rata pay for reduced hours, job shares and part-time contracts.

Instantly see your pro rata salary and take home pay after tax.

£

Quick patterns:

Pro Rata Salary
£21,000
60.0% of full-time
Full-Time Salary
£35,000
Working Pattern
22.5 / 37.5 hrs
Take Home Pay (Net)
£16,794
per year
Monthly
£1,400
Weekly
£323
Daily
£65

Annual Deductions

Gross Pro Rata Salary£21,000
Income Tax-£1,476
National Insurance-£1,680
Pension (5%)-£1,050
Take Home Pay£16,794

Pro Rata Holiday Entitlement

Based on 28 days full-time entitlement (including bank holidays):

16.8 days

Minimum statutory entitlement: 25.2 weeks

How to Calculate Pro Rata Salary

The Pro Rata Formula

Pro rata means "in proportion". To calculate your pro rata salary:

Pro Rata = Full-Time Salary × (Your Hours ÷ Full-Time Hours)

Example: £35,000 × (24 ÷ 37.5) = £22,400

Common Working Patterns

  • Full-time (37.5 hrs)100%
  • 4 days (30 hrs)80%
  • 3 days (22.5 hrs)60%
  • Half-time (18.75 hrs)50%

Pro Rata Salary Examples

Full-Time Salary4 Days (80%)3 Days (60%)Half-Time (50%)
£25,000£20,000£15,000£12,500
£35,000£28,000£21,000£17,500
£45,000£36,000£27,000£22,500
£60,000£48,000£36,000£30,000

Pro Rata Salary Calculator FAQ

What does pro rata salary mean?
Pro rata means "in proportion" in Latin. A pro rata salary is the proportional amount you earn when working fewer hours than a full-time equivalent. For example, if a full-time role pays £40,000 and you work 3 days instead of 5, your pro rata salary would be £24,000 (60% of the full-time salary).
How do I calculate my pro rata salary?
To calculate your pro rata salary, divide your working hours by the full-time hours, then multiply by the full-time salary. For example: If full-time is 37.5 hours at £30,000 and you work 22.5 hours: (22.5 ÷ 37.5) × £30,000 = £18,000 pro rata salary.
Is holiday entitlement pro rata too?
Yes, holiday entitlement is also calculated pro rata. If full-time employees get 28 days holiday and you work 60% of full-time hours, you'd get 16.8 days (28 × 0.6). This includes bank holidays. The minimum statutory entitlement is 5.6 weeks pro rata.
What are full-time hours in the UK?
There's no legal definition, but typical full-time hours in the UK are 35-40 hours per week. Common standards are 37.5 hours (7.5 hours × 5 days) or 40 hours (8 hours × 5 days). Some industries use different standards - always check with your employer what they consider full-time hours.
How does tax work on pro rata salary?
Tax on a pro rata salary works the same as any other salary - you get the full personal allowance (£12,570) and pay tax on earnings above that. Part-time workers often pay less tax overall because their annual earnings are lower. Our calculator shows your exact take home pay after tax.