Centimeter to Millimeter Converter
Length · unit-converter
Convert Centimeter to Millimeter with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use SI-based definitions (international yard, nautical mile, etc.).
Calculator
From: Centimeter (cm)
To: Millimeter (mm)
About Centimeter
The centimeter is a metric unit equal to one hundredth of a meter (0.01 m). It is convenient for everyday objects, paper sizes, and body measurements.
About Millimeter
The millimeter is a metric unit equal to one thousandth of a meter (0.001 m). It is used for precision engineering, 3D printing, and small tolerances.
How to convert centimeters to millimeters
1 centimeter is equal to 10 millimeter:
1 cm = (0.01 m ÷ 0.001 m) mm = 10 mm
1 centimeter = 10 millimeters (metric).
Each centimeter is defined as 0.01 m and each millimeter as 0.001 m, so one cm equals 0.01 ÷ 0.001 mm = 10 mm.
Let d(cm) be the numeric value of the same length measured in Centimeter (cm), and d(mm) the value in Millimeter (mm). Then:
d(mm) = d(cm) × (0.01 / 0.001)
Equivalently, divide by how many cm fit into one mm (meters per mm divided by meters per cm):
d(mm) = d(cm) ÷ 0.1
Or: millimeter = centimeter ÷ 0.1
Examples
Example #1: Convert 20 cm to millimeter
20 cm = 20 cm × (0.01/0.001) mm = 200 mm
20 cm = 20 cm ÷ 0.1 = 200 mm
Example #2: Convert 50 cm to millimeter
50 cm = 50 cm × (0.01/0.001) mm = 500 mm
50 cm = 50 cm ÷ 0.1 = 500 mm
Summary
To convert Centimeter to Millimeter, multiply the value in cm by the ratio of meters per cm divided by meters per mm. Equivalently: value_mm = value_cm × (0.01 / 0.001). Numerically, 1 cm equals 10 mm.
Relationship context
Both units are metric (SI) and tied to the meter. Converting between them uses powers of ten (or simple rational factors), so the relationship is exact in decimal arithmetic. The factor from Centimeter to Millimeter is 1.000000e+1 (1 cm = 10 mm).
Conversion tables
| Centimeter (cm) | Millimeter (mm) |
|---|---|
| 0.1 | 1 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 6 | 60 |
| 7 | 70 |
| 8 | 80 |
| 9 | 90 |
| Centimeter (cm) | Millimeter (mm) |
|---|---|
| 10 | 100 |
| 20 | 200 |
| 30 | 300 |
| 40 | 400 |
| 50 | 500 |
| 60 | 600 |
| 70 | 700 |
| 80 | 800 |
| 90 | 900 |
| 100 | 1,000 |
Conversions outside the hub list
The grid on the category page lists hub units only. These pairs include at least one unit outside that hub set (same tools: formulas and tables on each page).
- cm to nmiCentimeter to Nautical Mile
- cm to chainCentimeter to Chain
- cm to fathomCentimeter to Fathom
- cm to umCentimeter to Micrometer
- cm to nmCentimeter to Nanometer
- cm to angstromCentimeter to Angstrom
- cm to pmCentimeter to Picometer
- nmi to mmNautical Mile to Millimeter
- chain to mmChain to Millimeter
- fathom to mmFathom to Millimeter
- um to mmMicrometer to Millimeter
- nm to mmNanometer to Millimeter