Sun Prairie Chamber of Commerce: We facilitate the growth and prosperity of our members through connection, promotion and education. Plus, all employees within your organization can take advantage of Chamber programs and services! Membership is good from January 1 through December 31 of the given year. Membership renewal dues are billed annually in December and due in January. To determine your membership level by FTE - A. Each Full-time employee equals 1. B. To convert Part-time employees into an FTE - determine the total number of hours worked by the PT employees and divide by 40. C. Add the two together for your total FTE.