Pro rata is Latin for "a proportion of." In terms of salary it refers to the amount a part-time worker would make if they worked full-time. This is often calculated for part-time positions with "benefits" such as pensions, holidays, maternity pay and parental leave, but you only receive these benefits in proportion to how much you work compared to a 40-hour work week.
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Gather your data. You will need the number of hours worked for a full-time employee (A); the number of hours you work per week (B); and the number of weeks you will be working (C). As an example, let's define these variables as A = 40, B = 28, C = 52. A full-time annual salary is £65,000.
Divide the full-time annual salary by 52. The equation is £65,000 / 52 = £1,249.
Divide Step 2 (£1,249) by the full-time number of hours (40). The equation is $1,923 / 40 = £31. This is your hourly rate.
Multiply Step 3 (£31), the hourly rate, by the number of hours you work each week (28). The equation is $48 * 28 = £873. This is your weekly salary.
Multiply your weekly salary (£873) by 52. The equation is $1,344 * 52 = £45,427. This is your annual salary.
Divide your annual salary ($70,000) by 12 for your pro rata salary. The equation is £45,500.00 / 12 = £3,791.6.
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