There are 2.54 centimeters in an inch, so to convert centimeters to feet, it is necessary to first divide the number of centimeters by 2.54 and then divide the result by 12 to convert to feet. To convert 191 centimeters to inches, 191 is divided by 2.54, which gives a result of 75.2 inches. Because there are 12 inches in a foot, 75.2 is then divided by 12 to provide the final conversion to 6.27 feet.
A centimeter is equal to 1/100th of a meter. The prefix "centi" is the International System of Units designation for a factor of 1/100. For rough estimations, the width of the fingernail on an average adult makes an approximation of 1 centimeter.
The United States is one of the few countries in the world that has not fully embraced the metric system. The system has, however, been used to a greater extent in recent years. The metric system is a base-10 system, which makes it much easier to convert between measurement units such as centimeters, meters and kilometers. Some common metric measurements are the 1-meter typical height of a doorknob from the floor or the 12-centimeter diameter of a DVD or CD.