MM to CM Converter
Convert millimeters (mm) to centimeters (cm) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
mm to cm formula
cm = mm ÷ 10
1 millimeter = 0.1 centimeters · 1 centimeter = 10 millimeters
To convert millimeters to centimeters, divide the value by 10. For example, 25 mm:
cm = 25 ÷ 10cm = 2.5
So 25 mm = 2.5 cm.
Mental math shortcut
This conversion is exact, so there is no need to estimate: just divide by 10.
mm to cm conversion table
cm back to mm
The same values converted the other way, rounded for everyday use:
| Centimeters | Millimeters |
|---|---|
| 0.1 cm | 1 mm |
| 0.5 cm | 5 mm |
| 1 cm | 10 mm |
| 1.5 cm | 15 mm |
| 2 cm | 20 mm |
| 2.5 cm | 25 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
About the units
Millimeters (mm)
A millimeter is one thousandth of a meter (0.1 cm). It is used for small, precise measurements like rainfall, screws and paper thickness.
Centimeters (cm)
A centimeter is one hundredth of a meter. It is the everyday metric unit for body height, clothing and short lengths.
Frequently asked questions
How many centimeters are in a millimeter?
One millimeter equals 0.1 centimeters.
What is 25 mm in cm?
25 mm = 2.5 cm.
How do I convert cm back to mm?
Multiply the centimeters by 10. Or use the CM to MM converter.