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Length
Millimeters to Centimeters
Convert millimeters (mm) to centimeters (cm). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mm = 0.1 cm
Millimeters to Centimeters Conversion Table
Common values, ready to copy:
| millimeters | centimeters |
|---|---|
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 5 mm | 0.5 cm |
| 10 mm | 1 cm |
| 25 mm | 2.5 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
| 1,000 mm | 100 cm |
Formula
centimeters = millimeters × 0.1
Length conversions use the SI definition: 1 inch is exactly 0.0254 meters and 1 mile is exactly 1,609.344 meters. The factor above is the exact ratio between millimeter and centimeter.
About Millimeters and Centimeters
Millimeters (mm): One thousandth of a meter, where the meter was originally defined in 1799 as one ten-millionth of the equator-to-pole distance, and is now defined by the speed of light. Common uses: The default precision unit in engineering drawings, machining tolerances, manufacturing specifications, and most metric-country construction blueprints.
Centimeters (cm): One hundredth of a meter; the metric system was formalized by the French Academy of Sciences in 1799 and the meter has been refined four times since, most recently in terms of the speed of light. Common uses: Body measurements, paper sizes, small everyday distances, and the universal unit for fabric and sewing-pattern dimensions outside the United States.
How the conversion works
Length conversions use the SI definition: 1 inch is exactly 0.0254 meters and 1 mile is exactly 1,609.344 meters. The factor above is the exact ratio between millimeter and centimeter.
The exact relationship is centimeters = millimeters × 0.1, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between millimeters and centimeters comes up wherever length measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.