This study examined the relationship between students' self-reported high school grade point average (HSGPA) from the SAT Questionnaire and their HSGPA provided by the colleges and universities they attend. The purpose of this research was to offer updated information on the relatedness of self-reported (by the student) and school-reported (by the college/university from the high school transcript) HSGPA, compare these results to prior studies, and provide recommendations on the use of self-reported HSGPA. Results from this study indicated that even though the correlation between the self-reported and school-reported HSGPA is slightly lower than in prior studies (r = 0.74), there is still a very strong relationship between the two measures. The following tables and figure are appended: (1) HSGPA Grading Scales Across Higher Education Institutions in the Study; (2) Recoding of School- and Self-Reported HSGPA; (3) Descriptive Statistics for the Academic Measures (N = 40,301); (4) Self-Reported Versus School-Reported HSGPA Accuracy: Correlations, Percentage of Exact HSGPA Match, Underreporting and Overreporting of HSGPA in Grade Steps by Race/Ethnicity, Parental Income, Parental Education Level and SAT Score Band; (5) Accuracy of Self-Reported HSGPA by HSGPA Value; (6) Percentage of Exactly Matching, Underreporting and Overreporting of HSGPA by Demographic Characteristics in the SAT Score Band; and (7) Self-Reported HSGPA Item on the SAT Questionnaire (2005-2006).