10 mm berapa cmCentimeter. 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 1100 meters. Historyorin: AMillimeters to centimeters conversion table ; 9 mm, 0.9 cm ; 10 mm, 1 cm ; 20 mm, 2 cm ; 30 mm, 3