CM to MM Converter
Convert centimeters to millimeters instantly
Formula
Centimeters → Millimeters
1 cm = 10 mm
mm = cm × 10
💡 Shortcut: shift the decimal point one place to the right
- 20 cm = 200 mm
- 2.3 cm = 23 mm
- 100 cm = 1000 mm
Millimeters → Centimeters
1 mm = 0.1 cm
cm = mm ÷ 10
💡 Shortcut: shift the decimal point one place to the left
- 200 mm = 20 cm
- 23 mm = 2.3 cm
- 1000 mm = 100 cm
Unit Definitions
Centimeter (cm): One hundredth of a meter. The prefix centi- means 1/100.
Millimeter (mm): One thousandth of a meter. The prefix milli- means 1/1000.
Conversion Reference Table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 | 1 |
| 0.5 | 5 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 25 | 250 |
| 30 | 300 |
| 40 | 400 |
| 50 | 500 |
| 75 | 750 |
| 100 | 1000 |
| 150 | 1500 |
| 200 | 2000 |
| 500 | 5000 |
| 1000 | 10000 |
Frequently Asked Questions
How many mm are in 1 cm?
There are 10 millimeters in 1 centimeter.
How do I convert cm to mm?
Multiply the number of centimeters by 10. For example, 5 cm × 10 = 50 mm.
What is the difference between cm and mm?
A centimeter is 10 times larger than a millimeter. 1 cm = 10 mm.
How do I convert mm back to cm?
Divide the number of millimeters by 10. For example, 50 mm ÷ 10 = 5 cm.
How many cm are in 1 meter?
There are 100 centimeters in 1 meter.