There are approximately 5.91 inches in 15 centimeters. To convert centimeters to inches, it is necessary to divide by 2.54 as there are 2.54 centimeters in an inch.
An inch is a unit used in the imperial system of measurements, and a centimeter is used in the metric system. Many countries around the world continue to use the inch as a measurement of length, including the United States, Canada and the United Kingdom. International standardization of an inch has meant that the internationally accepted length of one inch is exactly 2.54 centimeters. Prior to this standardization, slight variations of the length of an inch were used around the world.