What this conversion means in practice
Millimeters and centimeters share the same meter backbone; only the prefix moves. Divide by ten, or shift the decimal left one place.
Twenty-five mm is 2.5 cm (common drill bit). One hundred mm is 10 cm, not 1 cm.
This is exact SI prefix math; no imperial crossover on this page.
How to convert millimeter to centimeter
Multiply the millimeter value by 0.1 to get centimeter.
Example: 25 mm × 0.1 = 2.5 cm
Millimeter
Definition: A millimeter (mm) equals one-thousandth of a meter.
History and origin: Adopted widely where metric precision is needed without fractions.
Current use: Used in machining, manufacturing, drafting, and tolerancing.
Centimeter
Definition: A centimeter (cm) equals one-hundredth of a meter.
History and origin: Part of the decimal metric hierarchy introduced for coherent conversion.
Current use: Common in body dimensions, consumer products, and education.
Millimeter to Centimeter conversion table
| Millimeter (mm) | Centimeter (cm) |
|---|---|
| 0.1 mm | 0.01 cm |
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 3 mm | 0.3 cm |
| 5 mm | 0.5 cm |
| 10 mm | 1 cm |
| 20 mm | 2 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
| 1,000 mm | 100 cm |
Millimeter to Centimeter FAQ
mm to cm for shop notes and science class.
How many cm is 1 mm?
0.1 cm exactly.
How many mm in 1 cm?
10 mm exactly.
Inches?
Leave metric first; use mm ↔ in when you need US units.