This page gives an example to calculate the cost to an individual faculty member to buy out a course. This document contains information about how to calculate the cost to buy out a course and a link for more information on fringe rates.
The required faculty teaching load is 2 courses a semester or 4 courses in an academic year. A course is equal to 20% of total faculty salary plus the applicable fringe benefit rate. For academic year 2015-16 the fringe benefit rate is 37.0%. The fringe benefit rate changes every year, check the UW Research and Sponsored Programs fringe rate page.
Example: A 9-month salary is $80,000. Calculation to figure what the cost of buying out a course at this salary level in AY2016: $80,000 x 20% = $16,000 x 1.37% = $21,920.