MM to CM and CM to MM Converter
Two-way converter: turn millimeters into centimeters or centimeters into millimeters in one step.
Type a value into either field — conversion is instant
About the Millimeters ↔ Centimeters conversion
Converting mm to cm comes up with rulers, technical drawings, part dimensions and school work.
The factor: 1 cm = 10 mm. For example, 25 mm = 2.5 cm. The converter works both ways automatically — type a value into either field.
Everything is calculated instantly in your browser: no data is sent anywhere and the result appears as you type.
Why this converter
Both directions
Convert millimeters to centimeters and back by typing into either field.
Accurate
Uses the exact factor: 1 cm = 10 mm, no rough rounding.
Nothing to install
Works in the browser on phone and desktop, no sign-up.
FAQ
How much is 1 mm in cm?
1 cm = 10 mm. For example, 25 mm = 2.5 cm.
How do I convert millimeters to centimeters?
Type the value into the “Millimeters” field — the result in centimeters appears instantly. The reverse works the same way.
Is the converter accurate?
Yes — it uses the internationally accepted factor (1 cm = 10 mm).