cm to mm – centimeters to millimeters conversion

cm to mm – centimeters to millimeters conversion

Conversion online Calculator 

Metric Length Converter

Convert between centimeters and millimeters with precision

Centimeters to Millimeters

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Millimeters to Centimeters

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Batch Converter

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Conversion Reference

Key Formulas:

  • 1 centimeter (cm) = 10 millimeters (mm)
  • 1 millimeter (mm) = 0.1 centimeters (cm)

Common Values:

  • 5 cm = 50 mm
  • 10 cm = 100 mm
  • 25 cm = 250 mm
  • 100 cm = 1000 mm (1 meter)

Practical Examples:

Standard Ruler

  • Length: 30 cm = 300 mm
  • Small divisions: 1 mm

A4 Paper Size

  • Width: 21 cm = 210 mm
  • Height: 29.7 cm = 297 mm

Credit Card

  • Width: 8.56 cm = 85.6 mm
  • Height: 5.4 cm = 54 mm
Metric converter tool • Last updated May 2025
MM to CM

How to convert centimeters to millimeters

1 centimeter is equal to 10 millimeters:

1 cm = 10 mm

The distance d in millimeters (mm) is equal to the distance d in centimeters (cm) times 10:

d(mm) = d(cm) × 10

Example

Convert 20 cm to millimeters:

d(mm) = 20cm × 10 = 200mm

Centimeters to millimeters conversion table

Centimeters (cm)Millimeters (“)
0.01 cm0.1 mm
0.1 cm1 mm
1 cm10 mm 
2 cm20 mm
3 cm30 mm
4 cm40 mm
5 cm50 mm
6 cm60 mm
7 cm70 mm
8 cm80 mm
9 cm90 mm
10 cm100 mm
20 cm200 mm
30 cm300 mm
40 cm400 mm
50 cm500 mm
60 cm600 mm
70 cm700 mm
80 cm800 mm
90 cm900 mm
100 cm1000 mm

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