A. FIFA criteria for Size 5 balls, Inspected Category Ball Size Circumference Weight 5 68 – 70 cm 26 ¾” – 27 ½’ 410 – 450 grams 14 ½ – 16 oz. USSF criteria for Size 3 & 4 balls Ball Size Circumference Weight 3 23 – 24 inches 11 – 12 oz. 4 25 – 26 inches 12 – 13 oz. Please Note: If a size 4 soccer ball measures 25 ¼” when you inflate it the first time, it is of regulation size. Most balls will stretch a little as they are used. The stretching process can add up to ¾” and the ball would still be of regulation size.