How to convert centimeters to inches

Step-by-step explanation of how to convert centimeters to inches, with formulas, worked examples, and a free online calculator.

Centimeters and inches are both units of length. Inches belong to the Imperial system (used in the United States), while centimeters are part of the metric system (used almost everywhere else). One inch equals exactly 2.54 centimeters, so to convert from centimeters to inches, you divide the number of centimeters by 2.54. To convert the other way, multiply inches by 2.54. For example, 10 cm ÷ 2.54 = 3.937 inches, and 5 inches × 2.54 = 12.7 cm. Quick mental math: divide cm by 2.5 for a rough estimate of inches. This conversion is essential for clothing sizes, screen dimensions, and any product shipped internationally.