Convert centimeters to inches (cm to in) with the length conversion calculator, and learn the centimeter to inch formula. How can CM help you? CM is there in small and big moments, in joy and in adversity. Whatever life has in store for you, you will find an answer to your questions here. A centimetre (International spelling) or centimeter (American English), with SI symbol cm, is a unit of length in the International System of Units (SI) equal to one hundredth of a metre, centi- being the SI prefix for a factor of ⁠1 100⁠. [1] Definition: A centimeter (symbol: cm) is a unit of length in the International System of Units (SI), the current form of the metric system. It is defined as 1/100 meters. Free online ruler for accurate measuring in inches, centimeters, and millimeters. Use our real size digital ruler on any phone, tablet, or computer. A centimeter (cm) is a metric unit of measurement used for measuring the length of an object. Learn about the tools, conversion charts, examples, & more. Centimeters to inches (cm to in) converter and how to convert. centimetre (cm), unit of length equal to 0.01 metre in the metric system and the equivalent of 0.3937 inch. A centimeter is a unit of measuring length under the metric system of measurement. It can be abbreviated as 'cm'. Learn everything about centimeters in this article. 1cm is equivalent to 0.39370 inches. Origin: The metric, or decimal, system of weights and measures was defined and adopted in France in 1795. Using the metre as the basis for length measurements, the system is now used officially across the globe.