Goal Posts

Positioned at the center of the end line (back of the end zone) (Rule 1); Crossbar height: 10 feet (3.05 m) above the ground (Rule 1); Uprights: 18 feet 6 inches (5.64 m) apart, extending at least 30 feet above the crossbar (Rule 1)

Source: Rule 1

Send this to your friend — argument over.