Pro-Rata Salary Calculator
Work out what a full-time salary is worth when you work fewer days. Enter the full-time salary, the full-time days per week and your own days per week to see your pro-rata gross salary and the percentage of full-time.
Pro-rata salary
Working fraction
3 ÷ 5 = 60.0%
Pro-rata annual salary
£24,000
How this calculator works
Pro-rata means "in proportion". If you work fewer days than a full-time role, your salary is scaled by the fraction of full-time days you work. The calculator divides your days per week by the full-time days per week to find that fraction, applies it to the full-time annual salary, and shows the pro-rata annual salary plus monthly and weekly equivalents and the percentage of full-time hours.
What you enter
The full-time annual salary is the headline salary for the full-time role. The full-time days per week is the days a full-time colleague works — usually 5. Your employee days per week is the days you actually work. The fraction between them sets your pro-rata pay.
Pro-rata is gross, not take-home
This is a gross-pay calculation only. Pro-rata salary is the proportional gross amount before tax, National Insurance and deductions — it is not what you take home. Annual leave is often calculated separately by employers on a pro-rata basis too, so check your contract rather than assuming the salary figure includes holiday pay.
Formula
fraction = yourDaysPerWeek ÷ fullTimeDaysPerWeek proRataAnnual = fullTimeAnnualSalary × fraction monthlyPay = proRataAnnual ÷ 12
Worked example
- ›Full-time salary £40,000, you work 3 days/week vs 5 full-time days
- ›Fraction = 3 ÷ 5 = 0.6 (60%)
- ›Pro-rata annual = £40,000 × 0.6 = £24,000
- ›Pro-rata monthly = £24,000 ÷ 12 = £2,000
Frequently asked questions
What does pro-rata salary mean?
It means pay in proportion to full-time. Work 3 days of a 5-day week and you earn 3 ÷ 5 = 60% of the full-time salary.
How is pro-rata calculated for a four-day week?
Divide your days by the full-time days and apply that fraction to the full-time salary. A 4-day week against a 5-day full-time role is 4 ÷ 5 = 80% of the full-time salary.
Does pro-rata cover term-time work?
It can, if you set your working pattern to the weeks you actually work. Term-time roles are often annualised across the year, so check whether your employer pays over 52 weeks or only for worked weeks.
Are holidays and bonuses pro-rata too?
Paid holiday is usually pro-rata to full-time entitlement, and bonuses may be pro-rata, but both depend on your contract. This calculator shows gross pro-rata salary only, not leave or benefits.