Convert a full-time salary to its part-time equivalent with hourly, weekly, and monthly breakdowns.
This calculator provides an estimate of pro rata salary. Actual pay may vary depending on your employment contract, overtime, and benefits arrangements.
When moving from full-time to part-time work, or starting a new part-time role, understanding your pro rata salary is essential for financial planning. Pro rata simply means "in proportion," and a pro rata salary reflects the portion of a full-time salary you earn based on the hours you work. Many job advertisements list the full-time equivalent (FTE) salary, and it can be unclear what the actual take-home amount will be for part-time hours. This calculator converts any full-time salary into its part-time equivalent, giving you clear figures for your annual, monthly, weekly, and hourly pay so you can make informed decisions about your working arrangements.
To calculate your pro rata salary: 1. Enter the full-time annual salary for the role. This is the salary stated in the job advert or contract for full-time hours. 2. Enter the standard full-time hours per week for the role. In the UK, this is typically 37.5 hours for office-based roles or 40 hours in some industries. Check your employer's definition of full-time hours. 3. Enter the number of hours you will actually work per week. This is your contracted part-time hours. 4. Review your results, which show your pro rata annual salary, monthly pay, weekly pay, hourly rate, and the percentage of full-time you are working.
The pro rata calculation is straightforward: Pro rata salary = full-time salary x (your hours / full-time hours) For example, if the full-time salary is GBP 30,000 based on 37.5 hours per week, and you work 22.5 hours per week, your pro rata salary is 30,000 x (22.5 / 37.5) = GBP 18,000 per year. The monthly salary divides the annual pro rata figure by 12. The weekly salary divides by 52. The hourly rate is calculated from the full-time salary divided by (full-time hours x 52 weeks), which gives the same hourly rate regardless of whether you work full-time or part-time. The percentage of full-time is simply (your hours / full-time hours) x 100, which tells you the proportion of a full-time role you are working.
Part-time workers in the UK are protected by the Part-time Workers (Prevention of Less Favourable Treatment) Regulations 2000. This means part-time workers must receive the same hourly rate of pay, the same access to pension schemes, the same holiday entitlement (pro rata), and the same access to training and career development as their full-time colleagues. When comparing job offers, remember that your pro rata salary will also affect your income tax and National Insurance contributions. A lower salary may mean you fall into a lower tax band. Use our salary calculator to see your actual take-home pay after deductions. Your holiday entitlement is also calculated on a pro rata basis; use our holiday entitlement calculator to check your annual leave days.