Pro Rata Salary Calculator UK (2026)
Work out pro rata pay for part-time or reduced hours. UK-focused and updated for 2026. Convert full-time salary to your actual hours in seconds.
No signup. UK-focused. Updated for 2026.
Pro Rata Salary Examples (UK)
These examples show how a pro rata calculation works. The formula is based on hours worked compared with full-time hours.
Pro Rata Salary = (Full-Time Salary × Your Hours) ÷ Full-Time Hours
Example 1: 40 hours full-time, 20 hours part-time
- Full-time salary: £35,000
- Full-time hours: 40
- Your hours: 20
- Pro rata salary: (£35,000 × 20) ÷ 40 = £17,500
Example 2: 37.5 hours full-time, 30 hours part-time
- Full-time salary: £42,000
- Full-time hours: 37.5
- Your hours: 30
- Pro rata salary: (£42,000 × 30) ÷ 37.5 = £33,600
What is Pro Rata Salary?
Pro rata salary is a way of calculating part-time pay based on the full-time equivalent salary. If you also want to estimate take-home pay after tax, use our take-home pay calculator alongside this pro rata salary calculator.
When Pro Rata Is Used
Pro rata calculations apply to various working arrangements:
- Part-time work: Regular hours less than full-time
- Term-time only: Working during school terms only
- Compressed hours: Working fewer days but same weekly hours
- Job sharing: Sharing a full-time role between multiple employees
If you want to convert your pro rata result into an hourly figure, try our hourly calculator.
Pro Rata for Term-Time Only and Compressed Hours
If you are term-time only, your pro rata salary may also account for unpaid weeks outside term. If you work compressed hours (for example, 4 days instead of 5), your pro rata salary depends on total weekly hours rather than the number of days worked.
Frequently Asked Questions
What is pro rata?
Pro rata means "in proportion" and refers to calculating pay based on the proportion of hours you work compared to full-time hours. For example, if you work 20 hours per week and full-time is 40 hours, your pro rata salary would be 50% of the full-time salary.
What does pro rata mean?
Pro rata means proportional or in proportion. When applied to salary, it means your pay is calculated based on the proportion of hours you work compared with the standard full-time hours for that role. This ensures part-time workers receive fair pay relative to full-time employees.
How do you calculate pro rata pay?
To calculate pro rata pay, divide your hours by full-time hours, then multiply by the full-time salary. For example, if full-time is 40 hours at £40,000 and you work 20 hours: (20 ÷ 40) × £40,000 = £20,000. Our pro rata salary calculator automates this calculation instantly.
What is a prorate calculator?
A prorate calculator (also called a pro rata calculator) is a tool that converts full-time salaries into part-time pay based on hours worked. It calculates the proportional salary by comparing your working hours to full-time hours, giving you accurate annual, monthly, and weekly pay figures.
Is prorata the same as pro rata?
Yes, prorata and pro rata mean the same thing. "Pro rata" is the correct spelling (two words), while "prorata" is a common alternative spelling (one word). Both refer to proportional calculations, where pay is calculated based on the proportion of hours worked compared to full-time hours.
What are the benefits of pro rata calculation?
Pro rata calculation ensures fair pay for part-time workers by:
- Maintaining pay equity between full-time and part-time employees
- Providing transparency in salary calculations
- Ensuring proportional benefits and entitlements
- Making it easier to compare different working arrangements
How does pro rata affect benefits?
Many benefits are also calculated pro rata for part-time workers, including:
- Holiday entitlement
- Pension contributions
- Bonus payments
- Other workplace benefits
However, some benefits may be provided in full regardless of hours worked. To plan your finances effectively with your pro rata income, use our budget planner.
Is pro rata calculation required by law?
Yes, UK employment law requires that part-time workers receive the same treatment as full-time workers on a pro rata basis. This is covered by the Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000.