What is 21 centimeters to inches? The answer is that 21 cm equals 8.2677 inches.
How to convert 21 cm to inches? We know that one inch is equal to 2.54 centimeters, so to convert 21 centimeters to inches, we must divide the amount of centimeters by 2.54, which means that 21 centimeters is equal to 21 cm ÷ 2.54 = 8.2677 inches.
See also: How to convert 21 inches to cm.