The length of a football field, from goal line to goal line, is 100 yards, or roughly 300 feet. 3 feet make up one yard. A yard is 36 inches long, hence 100 yards are made up of 3,600 inches.
The imperial system of measurement gave rise to the U.S. customary units of length of inches, feet, and yards. The United States is where this system is largely employed. When measuring length, the metric system employs units such the millimetre, centimetre, and metre. Since one yard is equal to 0.9144 metres in the metric system, 100 yards are comparable to 91.44 metres.