Self-reported measures for body mass index (BMI) are considered a limitation in research design, especially when they are a primary outcome. Studies have found some populations to be quite accurate when self-reporting BMI; however, there is limited research on the accuracy of self-reported measurements in adolescents. The purpose of this study was to test the consistency of self-reported and objectively measured BMI of a sample of male and female adolescents. This was a sub-project of the larger Get Fruved study which focused on innovative strategies to promote health in adolescents. A sample was recruited from five high schools in four states (Tennessee, South Dakota, Kansas, and Florida). Participants (n = 425) were asked to self-report their height and weight, followed by being measured by a trained researcher. Self-reported and objective BMI were calculated. Regression was used to understand differences in accuracies with and without gender. Chi-square and Cohen's kappa coefficient were used to understand agreements between BMI categories. Participants were mostly white (46.8%) and female (52.9%). The mean BMI for males was higher than females (24.5(± 6.7) and 23.9(± 5.4), respectively). Regression analysis showed a significant interaction between gender and self-reported BMI (P =.01). Adequate agreement overall for BMI categories were found (Κ =.723, P <.001). Over 85% of participants reported themselves to be in the correct BMI category, with 10.2% reporting to be in a lower BMI category and 4.7% reporting to be in a higher BMI category. Adolescents have acceptable agreement between self-reported and objectively measured BMI. This study suggests gender may play a role in accurate reporting of BMI. Overall, self-reported BMI may be appropriate for use in adolescents, especially when resources are limited. Further research is needed to explore and understand the gender differences in self-reporting BMI. USDA. [ABSTRACT FROM AUTHOR]