The goal posts @ Collegiate and Professional levels are 18'6" (eighteen feet & six inches) apart, supended by a crossbar which is 10' (ten feet) off the ground. The uprights (the two posts) extend 30' (thirty feet) into the air, making for a total height of the goal posts of 40' (forty feet) off the ground in total.
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If you're asking how far apart are the two uprights on a single goal post, they are 18 feet 6 inches apart in college and pro, and 23 feet 4 inches apart in high school.
If you're asking how far apart is one team's goal post from the other team's goal post on the opposite end of the field, they are 120 yards apart. (10 yards for each end zone and 100 yards for the length of the field in-between.)