Basketballs are official size 7. Approx 29.5″ circumference and 22 oz weight. This is official size for high school, college, and the pros.
Footballs are considered youth size. Tip to tip across the seam is approximately 13″ and circumference is approx. 19″
Soccer balls are official size 5. Approx 27.5″ circumference.
Volleyballs are official size and weight. 25.5 to 26.5-inches in circumference and 9.2 to 9.9-ounces.