 This study examined the accuracy of self-reported body mass index, BMI, compared to objectively measured BMI in a sample of US adolescents. The results showed that self-reported BMI was generally accurate, but accuracy decreased as BMI increased. Additionally, females reported higher BMI's than males, which may indicate that females are more likely to underestimate their true BMI. This article was offered by Chelsea Allison, Sarah Colby, Audrey Oppo-Kuachimpong, and others.