Calculate your pro-rata salary when working part-time hours. Enter the full-time equivalent salary and your working hours to see your actual annual salary.
The salary you would earn if working full-time (37.5 hours/week)
Standard full-time is 37.5 hours per week
Calculate your pro-rata salary based on your working hours
Pro-rata is a Latin term meaning "in proportion." When applied to salary, it refers to the proportional payment you receive based on the hours you work compared to a full-time equivalent position.
For example, if a full-time position offers £40,000 per year for 37.5 hours per week, and you work 30 hours per week, your pro-rata salary would be calculated as:
(30 ÷ 37.5) × £40,000 = £32,000 per year
Pro-rata calculations are commonly used for part-time workers, job sharers, and those transitioning between full-time and part-time roles. Understanding your pro-rata salary helps you compare job offers accurately and understand your true earning potential.
Pro-rata salary means your pay is proportional to the hours you work compared to a full-time equivalent. If a full-time role pays £40,000 for 37.5 hours per week and you work 30 hours, your pro-rata salary would be £32,000 (30/37.5 × £40,000).
Pro-rata salary is calculated using this formula: (Your working hours ÷ Full-time hours) × Full-time salary. For example, working 22.5 hours when full-time is 37.5 hours at a £30,000 salary: (22.5 ÷ 37.5) × £30,000 = £18,000 pro-rata salary.
In the UK, full-time hours are typically 35-40 hours per week, with 37.5 hours being the most common standard. However, this can vary by industry and employer. Some sectors consider 35 hours full-time, while others may use 40 hours.
Part-time workers have the legal right to be treated no less favourably than full-time colleagues. Benefits like holiday entitlement, sick pay, and pension contributions are usually calculated on a pro-rata basis, meaning you receive a proportional amount.
Holiday entitlement is calculated pro-rata based on your working hours. If full-time workers get 28 days and you work 3 days a week (vs 5), you'd receive 16.8 days (28 × 3/5). This is often rounded up to 17 days.
Yes, pension contributions are typically based on your actual pro-rata salary, not the full-time equivalent. Both your contributions and your employer's contributions will be calculated on your reduced salary.
You can negotiate the full-time equivalent salary that your pro-rata is based on. When job hunting, compare the FTE salary to similar full-time roles to ensure you're being paid fairly. Your pro-rata percentage should match your working hours exactly.
Term-time contracts work differently - your annual salary is spread across 12 months but you only work during term time. The calculation includes weeks worked, not just hours per week. For example, working 39 weeks instead of 52 affects your pro-rata calculation.