Vertical jump performance is a critical determinant of success in basketball, especially among adolescent athletes who are in a key developmental stage. This study investigates the relationship between leg measurements, energy and macronutrient intake, and vertical jump performance in adolescent basketball players. A cohort of 400 male basketball players (200 females and 200 males, n=100 from each age group of 10-12 yrs and 13-15 yrs) was assessed for leg measurements, including thigh, calf and ankle circumferences and foot width and length. Dietary intake was recorded using a 3-day food diary, with subsequent analysis of total energy and macronutrient consumption. Vertical jump height was measured using a standardized jump test procedure. The findings revealed significant positive correlations between all leg measurements and vertical jump performance, with greater muscle mass in the thighs and calves positively associated with higher jump heights. Additionally, a balanced intake of macronutrients, particularly adequate protein and carbohydrate consumption, was linked to better vertical jump outcomes. These results underscore the importance of both physical and nutritional factors in optimizing athletic performance among adolescent basketball players. This study provides valuable insights for coaches and sports nutritionists aiming to enhance vertical jump performance through targeted training and dietary interventions. Future research should explore longitudinal effects and intervention-based approaches to further substantiate these findings.