📐 CM ↔ Millimeters Converter

Simple Metric Length Conversion

📏 Exact Conversion

1 centimeter = 10 millimeters (exact)
1 mm = 0.1 centimeters

🔄 Simple Math

CM to MM: Multiply by 10
MM to CM: Divide by 10

🔬 Precision

Millimeters used for precise measurements in engineering and manufacturing

Choose Conversion Mode:

🔄 CM ↔ Millimeters Converter

Centimeters: Length in centimeters (cm)

Millimeters: Length in millimeters (mm)

Unit	Symbol	In Millimeters	In Centimeters	Common Use
Micrometer	µm	0.001 mm	0.0001 cm	Microscopy, bacteria
Millimeter	mm	1 mm	0.1 cm	Precision measurements
Centimeter	cm	10 mm	1 cm	Everyday objects
Decimeter	dm	100 mm	10 cm	Rarely used
Meter	m	1,000 mm	100 cm	Room dimensions
Kilometer	km	1,000,000 mm	100,000 cm	Travel distances

📋 Quick Reference Tables

Centimeters to Millimeters

Centimeters	Millimeters
0.1 cm	1 mm
0.5 cm	5 mm
1 cm	10 mm
2.5 cm	25 mm
5 cm	50 mm
10 cm	100 mm
25 cm	250 mm
100 cm	1,000 mm

Millimeters to Centimeters

Millimeters	Centimeters
1 mm	0.1 cm
5 mm	0.5 cm
10 mm	1 cm
25 mm	2.5 cm
50 mm	5 cm
100 mm	10 cm
250 mm	25 cm
1,000 mm	100 cm (1 m)

🔧 Practical Applications

🔩 Engineering

Bolt Sizes: M3, M6, M8 (mm)
Tolerances: ±0.1 mm
Thread Pitch: 1.5 mm
Precision Parts: 0.01 mm accuracy

📐 Construction

Plywood: 18 mm (1.8 cm)
Drywall: 12.7 mm (1.27 cm)
Tile: 6-10 mm thickness
Grout Lines: 3-5 mm

🔬 Science

Microscope: Sub-mm precision
Lab Equipment: 0.1 mm markings
Cell Size: 10-100 µm
DNA Width: 2 nm (0.000002 mm)

🧮 Conversion Formulas

Centimeters to Millimeters

Formula:

mm = cm × 10

Why?

The prefix "centi" means 1/100

The prefix "milli" means 1/1000

1 cm = 1/100 m

1 mm = 1/1000 m

Therefore: 1 cm = 10 mm

Example:

5 cm × 10 = 50 mm

Millimeters to Centimeters

Formula:

cm = mm ÷ 10

cm = mm × 0.1

Related Conversions:

1 m = 100 cm = 1,000 mm

1 cm = 10 mm = 10,000 µm

1 mm = 1,000 µm = 1,000,000 nm

Example:

75 mm ÷ 10 = 7.5 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 cm	0.1 mm
0.1 cm	1 mm
1 cm	10 mm
2 cm	20 mm
3 cm	30 mm
4 cm	40 mm
5 cm	50 mm
6 cm	60 mm
7 cm	70 mm
8 cm	80 mm
9 cm	90 mm
10 cm	100 mm
20 cm	200 mm
30 cm	300 mm
40 cm	400 mm
50 cm	500 mm
60 cm	600 mm
70 cm	700 mm
80 cm	800 mm
90 cm	900 mm
100 cm	1000 mm