Pro rata is Latin for "a proportion of." In terms of salary it refers to the 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.

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 $100,000.

Divide the full-time annual salary by 52. The equation is $100,000 / 52 = $1,923.

Divide Step 2 ($1,923) by the full-time number of hours (40). The equation is $1,923 / 40 = $48. This is your hourly rate.

Multiply Step 3 ($48), the hourly rate, by the number of hours you work each week (28). The equation is $48 * 28 = $1,344. This is your weekly salary.

Multiply your weekly salary ($1,344) by 52. The equation is $1,344 * 52 = $69,888. This is your annual salary.

Divide your annual salary ($70,000) by 12 for your pro rata salary. The equation is $70,000.00 / 12 = $5,833.33.

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Working as a full-time freelance writer/editor for the past two years, Bradley James Bryant has over 1500 publications on eHow, LIVESTRONG.com and other sites. She has worked for JPMorganChase, SunTrust Investment Bank, Intel Corporation and Harvard University. Bryant has a Master of Business Administration with a concentration in finance from Florida A&M University.

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