Formula
cm to mm conversion formula
Use this relationship for a direct conversion:
mm = cm x 10
Worked example
2 cm = 20 mm.
Metric factors and international inch, foot, yard, mile, and nautical mile definitions are exact.
Length conversion
Convert Centimeter to Millimeter
1 centimeter (cm) equals 10 millimeter (mm). Enter any value below to convert from cm to mm.
Enter a value and choose units. Results update instantly.
1 cm = 10 mm
All Length units
From 1 cm| Unit | Value |
|---|---|
| Meter m | 0.01 |
| Kilometer km | 0.00001 |
| Centimeter cm | 1 |
| Millimeter mm | 10 |
| Micrometer μm | 10,000 |
| Nanometer nm | 10,000,000 |
| Inch in | 0.3937007874 |
| Foot ft | 0.032808399 |
| Yard yd | 0.010936133 |
| Mile mi | 0.0000062137 |
| Nautical mile nmi | 0.0000053996 |
| Light-year ly | 1.057000834e-18 |
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Quick reference
Centimeter to Millimeter table
| Centimeter (cm) | Millimeter (mm) |
|---|---|
| 0.01 | 0.1 |
| 0.1 | 1 |
| 1 | 10 |
| 2 | 20 |
| 5 | 50 |
| 10 | 100 |
| 25 | 250 |
| 50 | 500 |
| 100 | 1,000 |
| 1,000 | 10,000 |
From unit
About the centimeter
One hundredth of a meter.
Symbol: cm
To unit
About the millimeter
One thousandth of a meter.
Symbol: mm
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Conversion standard
Definitions are checked against NIST SP 811: Guide for the Use of the SI. Calculations use full internal precision before display rounding.
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cm to mm FAQ
How do you convert centimeter to millimeter?
Use the formula mm = cm x 10. 1 centimeter (cm) equals 10 millimeter (mm).
Is the cm to mm conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.