Formula
mm to cm conversion formula
Use this relationship for a direct conversion:
cm = mm x 0.1
Worked example
2 mm = 0.2 cm.
Metric factors and international inch, foot, yard, mile, and nautical mile definitions are exact.
Length conversion
Convert Millimeter to Centimeter
1 millimeter (mm) equals 0.1 centimeter (cm). Enter any value below to convert from mm to cm.
Enter a value and choose units. Results update instantly.
1 mm = 0.1 cm
All Length units
From 1 mm| Unit | Value |
|---|---|
| Meter m | 0.001 |
| Kilometer km | 0.000001 |
| Centimeter cm | 0.1 |
| Millimeter mm | 1 |
| Micrometer μm | 1,000 |
| Nanometer nm | 1,000,000 |
| Inch in | 0.0393700787 |
| Foot ft | 0.0032808399 |
| Yard yd | 0.0010936133 |
| Mile mi | 0.0000006214 |
| Nautical mile nmi | 0.00000054 |
| Light-year ly | 1.057000834e-19 |
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Quick reference
Millimeter to Centimeter table
| Millimeter (mm) | Centimeter (cm) |
|---|---|
| 0.01 | 0.001 |
| 0.1 | 0.01 |
| 1 | 0.1 |
| 2 | 0.2 |
| 5 | 0.5 |
| 10 | 1 |
| 25 | 2.5 |
| 50 | 5 |
| 100 | 10 |
| 1,000 | 100 |
From unit
About the millimeter
One thousandth of a meter.
Symbol: mm
To unit
About the centimeter
One hundredth of a meter.
Symbol: cm
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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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mm to cm FAQ
How do you convert millimeter to centimeter?
Use the formula cm = mm x 0.1. 1 millimeter (mm) equals 0.1 centimeter (cm).
Is the mm to cm conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.