Every 5 yards, a yard line is marked, and every 10 yards, a field number is marked. A numbered 10-, 20-, 30-, and 40-yard line divides each half of the field, and a numbered 50-yard line divides the field evenly in the middle.
There are also hash marks, which are shorter lines that span the length of the field between the 5-yard lines. One yard separates the hash markings. The distance between the two lines of hash markers is the fundamental distinction between high school, college, and NFL fields. At each level, the amount of space between the hash marks is as follows: