Graduation rate is one of the primary metrics used to determine whether students are prepared for college and career; however, there is no single, clear-cut definition of the metric across school districts or states. Moreover, the definition of the metric may change over time, even within the same district. This 17-page brief describes the two School District of Philadelphia (SDP) graduation rates and how they are calculated. It also outlines six-year trends in SDP’s graduation metrics (2013-14 through 2018-19).