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Convert mm to cm, cm to mm - Length Conversion

Use these online calculators to convert between millimeters (mm) and centimeters (cm). These Length conversion calculators provide a quick and easy way to convert:

  • mm to cm
  • cm to mm

Conversion Calculators

Enter your value in one of the conversion calculators below to convert mm to cm or convert cm to mm.

Convert mm to cm

Convert cm to mm

How to convert mm to cm: Use the conversion calculator on the left titled "Convert mm to cm". Enter a value in the mm field and click on the "Calculate cm" button. Your answer will appear in the cm field.

How to convert cm to mm: Use the conversion calculator on the right titled "Convert cm to mm". Enter a value in the cm field and click on the "Calculate mm" button. Your answer will appear in the mm field.

Conversion Definitions

The following is a list of definitions relating to conversions between millimeters and centimeters.

What is a millimeter (mm)?

A millimeter is a unit of length in the Metric System. The symbol for millimeter is mm. There are 1,000 millimeters in a meter. The International spelling is millimetre.

What is a centimeter (cm)?

A centimeter is a unit of length in the Metric System. The symbol for centimeter is cm. There are 100 centimeters in a meter. The International spelling is centimetre.

How many millimeters in a centimeter?

There are 10 millimeters in a centimeter.

How many centimeters in a millimeter?

There are 0.1 centimeters in a millimeter.

Understanding the Length Units

This table provides a summary of the Length units within their respective measurement systems.

Unit Symbol Measurement System Description
inches in or " US Customary Units (and Imperial)  
feet ft or ' US Customary Units (and Imperial) 1 foot = 12 inches
yards yd US Customary Units (and Imperial) 1 yard = 3 feet
miles mi US Customary Units (and Imperial) 1 mile = 1760 yards or 5280 feet
millimeter mm Metric System 1000 mm = 1 m
centimeter cm Metric System 100 cm = 1 m, 1 cm = 10 mm
decimeter dm Metric System 10 dm = 1 m, 1 dm = 10 cm
meter m Metric System 1 m = 1000 mm, 100 cm, 10 dm
kilometer km Metric System 1 km = 1000 m