The dimensions of a soccer ball vary depending on the age group, but the standard circumference of an adult soccer ball is 27 to 28 inches. There are also soccer balls for kids and youth.
Depending on the soccer league, there may be different regulations regarding soccer ball size. Soccer balls for kids under age 8 are size 3, have a circumference of 23 to 24 inches and weigh 11 to 12 ounces. Youth soccer balls, designed for ages 8 to 12, are size 4 with a circumference of 25 to 26 inches. They weigh 12 to 13 ounces.
Size 5 is the standard for adults and teenagers age 13 and above. This is typically the size used in professional soccer leagues. Size 5 soccer balls weigh 14 to 16 ounces.