400px|Diagram of an American football field  . The rectangular field of play used for American football games measures long between the goal lines, and () wide. The field is made of grass. In addition, there are end zones extending another past the goal lines to the "end lines", for a total length of . When the "football field" is used as unit of measurement, it is usually understood to mean , although technically the full length of the official field, including the end zones, is . There is a goal centered on each end line, with a crossbar above the ground and goalposts apart extending at least above the crossbar. Between the goal lines, additional lines span the width of the field at 5-yard intervals. These lines give the football fieldan appearance resembling that of a gridiron, which gives rise to "gridiron" being a nickname for a football field and for the sport itself  . The goal lines span the width of the field and run parallel to each end line. The 100 yards between the goal lines where most gameplay occurs is officially called the field of play in the NFL rulebook. Additional lines span the width of the field at 5-yard intervals from each goal line. End zones According to the high school rulebook recommendations, the field should be angled at approximately 1.2° (rising inch per foot, or 1 in 48) upward from each sideline to the center of the field so that the center is higher than the sidelines.NFHS Rules 2012, pp. 11–12, 13, 28. 
400px|Diagram of a modern American football field. 400px|Diagram of an early version of an American football field ; the intersecting gridlines of this early form gave birth the field's nickname of "gridiron" . The rectangular field of play used for American football games measures long between the goal lines, and () wide. The field is made of grass. In addition, there are end zones extending another past the goal lines to the "end lines", for a total length of . When the "football field" is used as unit of measurement, it is usually understood to mean , although technically the full length of the official field, including the end zones, is . There is a goal centered on each end line, with a crossbar above the ground and goalposts apart extending at least above the crossbar. Between the goal lines, additional lines span the width of the field at 5-yard intervals. Originally, these lines ran across the field, giving it a checkerboard-like appearance resembling that of a gridiron, which gave rise to "gridiron" being a nickname for a football field and for the sport itself that has remained while the appearance has not . The goal lines span the width of the field and run parallel to each end line. The 100 yards between the goal lines where most gameplay occurs is officially called the field of play in the NFL rulebook. Additional lines span the width of the field at 5-yard intervals from each goal line. End zones According to the high school rulebook recommendations, the field should be angled at approximately 1.2° (rising inch per foot, or 1 in 48) upward from each sideline to the center of the field so that the center is higher than the sidelines.NFHS Rules 2012, pp. 11–12, 13, 28. See also Canadian football field
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See also Canadian football field