Millimeters to Centimeters
Convert millimeters to centimeters and back, instantly.
Move one step on the metric length scale
Millimeters and centimeters are neighboring metric length units. One centimeter contains exactly ten millimeters, so their conversion is simple but frequently needed in drawings, product specifications, crafts, and schoolwork. Decimal input supports dimensions smaller than either whole unit.
With the default input, 10 millimeters converts to exactly 1 centimeter. Reversing direction converts 1 centimeter to exactly 10 millimeters. The quick reference table makes common values visible and the six-significant-figure formatting keeps longer decimals controlled.
Private exact metric conversion
The measurement is processed only in your browser and is never uploaded. This tool changes units and does not assess ruler precision, manufacturing tolerance, or significant digits in the source measurement. Preserve only the precision justified by the original instrument.
Frequently Asked Questions
How many millimeters are in one centimeter?
One centimeter contains exactly ten millimeters.
Why is this conversion exact?
Both are decimal subdivisions of the meter, so the relationship is defined by powers of ten.
Can the calculator handle fractions of a millimeter?
Yes. The number input accepts decimals in both directions.
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