Quick answer
- Pro-rata salary starts from the full-time salary and applies the reduced work pattern.
- FTE percentage normally compares weekly hours, while a shorter paid year adds a second adjustment.
- A four-day week can be reduced hours or compressed full-time hours.
- Part-time workers can still accrue paid annual leave.
Pro-Rata Salary Calculator
Open this Irish calculator to test your own numbers and compare the result with the guide.
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The pro-rata formula
The hours ratio compares your weekly hours with full-time weekly hours. The paid-weeks ratio is needed only when your salary covers fewer paid weeks than the full-time benchmark.
FTE percentage versus overall work-pattern percentage
FTE commonly describes weekly hours as a share of full-time hours. If both roles cover the same paid year, that hours percentage also drives salary. A shorter paid working year requires a separate weeks ratio, so the overall salary percentage can be lower than the weekly-hours FTE.
Three-day and four-day weeks
Use weekly hours, not days alone. Three normal full-time-length days may differ from three shorter days. A four-day arrangement may be 80% hours, another percentage, or compressed full-time hours with no salary reduction.
Job sharing
A job-share salary depends on each person’s contracted share, not automatically one half. Enter the full-time salary and the hours and paid weeks attached to your own share. Employer or public-service rules may add role-specific rounding or allowances.
Reduced weekly hours
When paid weeks are unchanged, the main adjustment is the weekly-hours ratio. Keep allowances, premiums and benefits separate until the employer confirms whether they reduce proportionally or remain fixed.
Shorter working year and term-time arrangements
Where part of the year is genuinely unpaid, the paid-weeks ratio reduces the salary in addition to the weekly-hours ratio. Do not use this adjustment for ordinary paid annual leave.
Variable-hour part-time work
The pro-rata calculator is best for a salary quoted from a full-time benchmark. If you are paid for each hour and weekly hours vary, use the Hourly to Annual Calculator and run low, typical and high scenarios instead.
Part-time annual leave
Part-time status does not remove annual-leave rights. Entitlement and leave pay depend on the applicable hours-based rules and employment pattern. Paid leave should remain represented in paid weeks; check WRC or Citizens Information guidance for the entitlement method.
Frequently asked questions
What does pro-rata salary mean?
It means a full-time salary is adjusted in proportion to your work pattern.
How is FTE percentage calculated?
Divide your weekly hours by the full-time weekly hours and express the result as a percentage.
Is a four-day week always 80% pay?
No. It depends on hours. Compressed full-time hours may remain 100% pay.
How does job-share salary work?
Use your contracted share of full-time hours and any paid-weeks adjustment. Do not assume every job share is exactly 50%.
Should paid annual leave reduce my paid weeks?
No. Paid leave remains paid time.
What if I work fewer weeks each year?
Use the paid-weeks inputs when those weeks are genuinely unpaid.
Can I use this for variable hourly work?
Use the Hourly to Annual Calculator when pay is based on each hour rather than a full-time salary benchmark.
Does pro-rata salary include tax?
No. Use the final gross annual result in the Net Salary Calculator.
Sources & references
Related calculators
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