<P> In most forms of professional football in the U.S., including the National Football League and most forms of indoor football, the hash marks are in line with the goal posts, both being 18 feet 6 inches apart in the NFL and between 9 and 10 feet in indoor football . High school football, college football and Canadian football have hash marks significantly wider than the goal posts . The college football standard, which was the previous standard in the NFL (1945--1971), is 40 feet apart, (20 yards from the sidelines) introduced in 1993 . Previously, the college width was the same as the high school standard, at one - third of the width of the field (531⁄3 feet). </P> <P> The Canadian standard is 51 feet in width, 24 yards from each sideline . A Canadian football field width is 65 yards (195 feet), 35 feet wider than those in the United States . </P>

Width of hash marks on a football field