Converting centimeters (cm) to inches (in) can be done with the formula: in = cm * 0.39. Centimeters and inches are both units for measuring short distances. Although a calculator could be used for precision purposes, many conversions from centimeters to inches can be quickly estimated or calculated on paper.Continue Reading
Learn how many centimeters are in each inch and vice versa. There are approximately 2.54 centimeters (cm) in each inch (in), which creates the equation 2.54cm = 1in. Because 1/2.54 is approximately 0.39, you can also write 1cm = 0.39in. This tells you that there are a little more than 2.5 centimeters in every inch and that 1 centimeter is about 0.4 or 2/5 of an inch.
To convert centimeters to inches, create an equation that cancels the centimeter unit and replaces it with inches. For example, 47cm * 0.39in / 1cm = 18.33in, because 1cm/1cm can be reduced to 1 with no remaining units.
Make sure that you performed the calculation correctly. A major indicator that you performed the correct operation is that there should be less than half as many inches as there were centimeters. In the example, 18.33 is less than half of 47. You could also perform the operation backwards to see if you can get your original number again.