Practical measurement guide
CM to MM Converter
Convert centimeters to millimeters with the exact metric factor of 10, examples, and precision notes.
Multiply centimeters by 10 to convert centimeters to millimeters.
cm
Decimals and fractions work, for example 1.5, 1/2, or 1 1/2.
mm
Try a value
2.54 cm = 25.4 mm
2.54 cm × 10 = 25.4 mm
Centimeters to millimeters formula
Multiply centimeters by 10. For example, 2.54 cm × 10 = 25.4 mm.
When millimeters are better
Use millimeters for hardware, small product details, drawings, and fit checks where small differences matter.
Related measurement tools
Frequently asked questions
How many mm is 1 cm?
1 cm equals exactly 10 mm.
How many mm is 2.54 cm?
2.54 cm equals exactly 25.4 mm.