A professional size football is uk size 5.
Adults use a size 5 soccer ball.
15 or 14
The circumference of a size 3 soccer ball is 23 to 24 inches. Size 4 soccer balls are 25 to 26 inches in circumference. The size used in professional soccer and upper level youth leagues is size 5 which is 27 to 28 inches. The smaller size 2 soccer balls are promotional soccer balls.
It depends how old you are but for professional players (example: MLS) it's a size 5
5 feet some times 6
they use 6 inch balls
The goal posts are now 8 yards wide, F.I.F.A increased the size of the goalposts intending to have more goals scored.
The size of a 7-a-side goal is the same dimensions for standard football (soccer) which is: - They must be square, rectangular, round or elliptical in shape and must not be dangerous to players. The distance between the posts is 7.32 m (8 yds) and the distance from the lower edge of the crossbar to the ground is 2.44 m (8 ft). Both goalposts and the crossbar have the same width and depth, which do not exceed 12 cm (5 ins). The goal lines must be of the same width as the goalposts and the crossbar.
I play middle school soccer, and the size for the soccer balls range from size 4 to size 5.