21 Centimeters (cm) to Millimeters (mm)
21 Centimeters (cm) to Millimeters (mm), Centimeters - Millimeters calculator. What is 21 Centimeters in Millimeters. You can calculate more units with our Converter Unit Tools
The centimeter (cm) and millimeter (mm) are units used to measure length. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about centimeter.
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Length Units Conversion
Length is referred to as the distance between two points or the measure of a distance between two endpoints of an object. In other words, length is the measurement of things from end to end. The method of converting the measures of length from one unit to another is called length conversion.
Centimeters (cm)
A centimetre or centimeter (American spelling), SI symbol cm is a unit of length in the International System of Units (SI), equal to one hundredth of a meter, centi being the SI prefix for a factor of 0.01 The centimetre was the base unit of length.
Millimeters (mm)
The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a meter, which is the SI base unit of length. Therefore, there are one thousand millimeters in a meter. There are ten millimeters in a centimeter.
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