109.7 metres!
An American football field is 109.7 meters (120 yards) long, including an end zone at each end, and 48.8 meters (160 feet) wide. The explorer shows the full length, from one end line to the other. The National Football League (NFL) sets these sizes in its rulebook.
The NFL rulebook describes the field as a rectangle 360 feet long and 160 feet wide. Goal lines cross it 10 yards (9.1 meters) in from each end. The 100 yards (91.4 meters) between the goal lines is called the field of play. The two 10-yard areas behind them are the end zones.
All distances are measured from the inside edges of the lines that mark the field's boundary. A solid white border at least 6 feet (1.8 meters) wide runs around the outside. Inside the boundary, the field covers 5,351 square meters (57,600 square feet), about 1.3 acres.
Lines cross the field every 5 yards, and short hash marks show each yard in between. Two rows of hash marks near the middle, 70 feet 9 inches (21.6 meters) in from each sideline, are called the inbounds lines. Most lines are 4 inches (10 centimeters) wide, but each goal line is 8 inches (20 centimeters) wide.
A goalpost stands at the back of each end zone, with its crossbar directly above the end line. The crossbar is 18 feet 6 inches (5.6 meters) long, and its top is 10 feet (3.05 meters) above the ground. Two uprights rise 35 feet (10.7 meters) above it. A kick from the field of play that passes over the crossbar and between the uprights is a field goal, worth 3 points.
The yard lines matter because progress in the game is counted in yards. A team with the ball gets four tries, called downs, to move it 10 yards (9.1 meters) forward. If it succeeds, it gets four more downs. If it fails, it loses the ball to the other team.
A team scores a touchdown, worth 6 points, when one of its players holds the ball on, above or past the other team's goal line. That includes catching the ball in the end zone.