A length of 5 feet 7 inches, in inches, comes out to 67 inches. There are 12 inches in a foot, so it is just a matter of multiplying 5 by 12 and then adding the remaining 7 inches.
Being part of the Imperial standard of measurements, the inch originated in England as the length of three barleycorns resting together. The term "foot" came after the Norman invasion of 1066, where it was defined as a length of 12 inches. Use of the Imperial system is mostly restricted to the United States and United Kingdom, whereas most of the rest of the world uses the metric system. The Imperial system's irregular measurements differ sharply from the metric system, in which measurements are evenly divided into place values of 10.