Convert millimeters to centimeters
Converting millimeters to centimeters is a common length task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 mm equals 0.1 cm, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert millimeters to centimeters
To convert millimeters to centimeters, multiply the number of millimeters by 0.1. For example, 10 mm × 0.1 = 1 cm.
cm = mm × 0.1
- Write down the value in millimeters you want to convert.
- Multiply it by 0.1 (the exact mm→cm factor).
- The result is your value in centimeters. Check it below with the converter or the table.
Conversion table
Common values of millimeters and their equivalents in centimeters:
| mm | cm |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 4 | 0.4 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 25 | 2.5 |
| 50 | 5 |
| 100 | 10 |
| 250 | 25 |
| 500 | 50 |
About these units
Millimeter (mm). A millimeter is one thousandth of a meter, the smallest length unit in everyday metric use. It is the standard precision unit in engineering drawings, machining and rainfall measurement.
Centimeter (cm). A centimeter is one hundredth of a meter, roughly the width of a fingernail. It is the everyday unit for body measurements, clothing sizes and small objects in metric countries.
Frequently asked questions
How do I convert millimeters to centimeters?
To convert millimeters to centimeters, multiply the number of millimeters by 0.1. For example, 10 mm × 0.1 = 1 cm. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many centimeters are in 1 millimeter?
1 mm = 0.1 cm. That is the fixed relationship used by this converter and by international standards.
How many millimeters are in 1 centimeter?
1 cm = 10 mm. If you are converting in the opposite direction, use our Centimeter to Millimeter converter for the dedicated table and FAQ.
Is the millimeters to centimeters conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.1 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is millimeter used for?
A millimeter is one thousandth of a meter, the smallest length unit in everyday metric use. It is the standard precision unit in engineering drawings, machining and rainfall measurement.