A regulation size soccer ball used in international matches and by people ages 12 and older weighs 14 to 16 ounces and has a circumference of 27 to 28 inches. In soccer, there are five different ball sizes depending on the age group and skill level.
Size three to size five are the only soccer balls that can be used in matches. Size three balls are used for children age 8 or younger and weigh 11 to 12 ounces and have a circumference of 23 to 24 inches. Size four balls are used for players between the ages of 8 to 12 and weigh 12 to 13 ounces and have a circumference of 25 to 26 inches. Size one and two are promotional soccer balls and have a circumference of 18 to 20 inches or 20 to 22 inches.