UK Pro Rata Salary Calculator
Use this tool to estimate your part-time or term-time salary from a full-time annual figure.
How pro rata salary works in the UK
“Pro rata” simply means “in proportion.” In salary terms, it means your pay is calculated as a proportion of a full-time salary. This is common for part-time roles, job shares, term-time contracts, and positions where someone works fewer than 52 weeks per year.
A typical UK pro rata calculation starts with the full-time annual salary for the role and then adjusts it based on your contracted hours. If your contract also includes fewer working weeks in a year, you apply a second proportional adjustment.
Formula used in this calculator
This page uses a standard two-step approach:
- Hours factor = your weekly hours ÷ full-time weekly hours
- Weeks factor = weeks worked per year ÷ 52
- Pro rata annual salary = full-time annual salary × hours factor × weeks factor
Example: If full-time is £35,000 at 37.5 hours, and you work 30 hours for all 52 weeks, your salary is: £35,000 × (30 ÷ 37.5) × (52 ÷ 52) = £28,000.
What the results mean
Annual, monthly, and weekly equivalent pay
The calculator gives your estimated gross annual salary plus monthly and weekly equivalents. These are gross amounts before tax, National Insurance, pension deductions, student loan deductions, and any salary sacrifice arrangements.
FTE percentage
You will see two percentages:
- Hours FTE: your weekly hours compared with full-time weekly hours.
- Adjusted FTE: hours FTE adjusted for weeks worked per year.
For year-round part-time work, these figures are usually the same. For term-time work, adjusted FTE will be lower.
Holiday entitlement (pro rata)
If you enter full-time holiday days, the tool estimates a proportional holiday entitlement. Real workplace policies can vary, especially where bank holidays are included separately or where leave is calculated in hours.
Common UK scenarios
- Part-time all year: reduce by hours only.
- Term-time only: reduce by both hours and weeks worked.
- Compressed hours: annual salary can be unchanged if total weekly hours remain equivalent.
- Mid-year starters: payroll is usually prorated by actual service dates as well.
Important notes before accepting an offer
Pro rata pay can look straightforward, but always confirm the contract details:
- Is the quoted figure gross annual salary or full-time equivalent (FTE) salary?
- Are you paid evenly each month or only during worked months?
- How are bank holidays handled for part-time schedules?
- Are overtime rates, bonuses, and pension contributions pro rated?
Frequently asked questions
Is pro rata salary the same as take-home pay?
No. Pro rata salary is gross pay. Your net pay depends on PAYE tax code, NI thresholds, pension scheme, and any deductions.
Can my hourly rate change when I move part-time?
Usually, the hourly rate stays equivalent for the same role and grade. However, check your contract and employer policy.
Does statutory holiday become pro rata too?
Yes, for part-time workers entitlement is usually adjusted proportionally. Employers may calculate this in days or hours depending on schedule.
Final thoughts
A pro rata salary calculator is one of the easiest ways to compare offers fairly, especially if you’re balancing childcare, education, or a portfolio career. Use this estimate as a starting point, then verify details in writing with HR or payroll before signing.