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The following are the recommended sizes of USA Basketball, the #1 Resource for Youth Basketball Coaching.

AGES 7-8 / Grades 1, 2, & 3 Boys and Girls size 5 (27.5”)

AGES 9-11 / Grades 4, 5 & 6 Boys and Girls size 6 (28.5”)

AGES 12-14 / Grades 7 & 8 Girls size 6 (28.5″) Boys size 7 (29.5″)

GRADES 9-12 Girls size 6 (28.5″) Boys size 7 (29.5″)

NOTE: 3×3 half-court play is also recommended for young players to foster enhanced participation and development.