There are 0.39370079 inches in a centimeter. Conversion Formula Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper. The formula to convert from cm to inches is: in = cm ÷ 2.54 Conversion Example A quick online length calculator to convert Centimeters (cm) to Inches (in). Plus learn how to convert cm to in NXuke.