Length / mm → cm
Convert Millimeters to Centimeters
From a small measurement to a long distance. Move between metric and imperial units. Convert Millimeters (mm) to Centimeters (cm). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Centimeters to Millimeters →
How to convert millimeters to centimeters
Length conversion changes the unit of a distance. Area and volume need squared and cubed factors; this calculator does not convert square feet or cubic feet.
Use x for the value in mm, b for the intermediate value in m, and y for the result in cm.
cm = mm × 0.001 ÷ 0.01
Worked examples
10 mm ≈ 1 cm
Step 1: (10 × 0.001) ≈ 0.01 m.
Step 2: 0.01 ÷ 0.01 ≈ 1 cm.20 mm ≈ 2 cm
Step 1: (20 × 0.001) ≈ 0.02 m.
Step 2: 0.02 ÷ 0.01 ≈ 2 cm.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Millimeters
A millimeter is one thousandth of a meter. Small dimensions and engineering drawings often use millimeters; retain the precision of the original measurement.
About Centimeters
A centimeter is one hundredth of a meter. It is often used for body measurements, product dimensions, and clothing sizes.
Definitions and sources
Use consistent length units when carrying dimensions into construction calculations.
Millimeters to centimeters reference table
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 | 0.1 |
| 5 | 0.5 |
| 10 | 1 |
| 25 | 2.5 |
| 50 | 5 |
| 100 | 10 |
| 1000 | 100 |
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