Millimeters to Centimeters
Millimeters to centimeters: 1 mm = 0.1 cm. Formula, a 12-row reference table, worked examples and the reverse conversion.
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Millimeters to centimeters: the relationship and formula
This page converts millimeters (mm) to centimeters (cm). In the converter's unit table, one millimeter equals 0.1 centimeters, so every result here comes from a single multiplication by 0.1.
Because the relationship is a plain ratio, doubling the millimeters doubles the centimeters, and 0 mm stays 0 cm. The inverse ratio is 10, meaning 1 cm = 10 mm.
Millimeters and their value in centimeters
This lookup list shows 12 mm values and what they become in cm. The step from one row to the next is not constant, but the ratio of 0.1 between the columns is.
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 0.25 | 0.025 |
| 1 | 0.1 |
| 1.5 | 0.15 |
| 3 | 0.3 |
| 6 | 0.6 |
| 8 | 0.8 |
| 15 | 1.5 |
| 40 | 4 |
| 75 | 7.5 |
| 150 | 15 |
| 400 | 40 |
| 2,000 | 200 |
These figures are generated, not typed in by hand, and follow the widget's rounding rules described in the questions further down.
Three sample conversions from millimeters to centimeters
Suppose a quantity is 350 millimeters. Scaling it by 0.1 gives 35 centimeters.
Try 6,500 mm as well. Multiplying by 0.1 gives 650 cm, which the reverse ratio 10 maps back to 6,500 mm.
Example 3. Starting from the other unit, 5.5 cm is 55 mm, since 1 cm = 10 mm.
Converting centimeters back to millimeters
The mirror-image page is Centimeters to Millimeters, where 1 cm = 10 mm. Its table and examples use centimeters as the starting unit.
The full Length Converter lets you choose any two units from the same list, not only mm and cm.
Related conversions for millimeters and centimeters
Other pairs that use the same unit table are listed here.
Frequently asked questions
What is 1 mm in cm?
The widget shows 0.1 centimeters for each millimeter. Scaled up, that makes 1 cm for 10 mm.
How many mm make up 1 cm?
The widget shows 10 millimeters for each centimeter. For 10 centimeters, the result is 100 millimeters.
What is 700 millimeters in centimeters?
700 millimeters is 70 centimeters. The calculation is 700 multiplied by 0.1, rounded the way the widget rounds.
How many decimal places does the mm to cm converter show?
Rounding happens only when a result is displayed. Between 1 and 1,000 the display has 10 significant digits, under 1 it has 8, and from 1,000 up it allows 6 decimals with comma separators; very large or very small results switch to scientific notation. Entering 0.123456789 mm shows 0.012345679 cm, and 1,234.5678 mm shows 123.45678 cm.
Which formula does the mm-to-cm converter use?
Conversion goes through a shared reference unit: mm is scaled into it, and the result is scaled out into cm. The two steps combine into one multiplication by 0.1.
How do I turn centimeters into millimeters?
The page titled "Centimeters to Millimeters" covers it, or you can press the swap button in the widget above. In the reverse direction multiply by 10, or equivalently divide by 0.1, giving 250 mm for an input of 25 cm.
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