Length converter
Millimeters to Centimeters
Millimeters and Centimeters measure the same quantity in different unit systems. The relationship is 1 mm = 0.1 cm, which gives 0.1 cm per mm. Below you can convert any value, check a worked example and read the full chart.
Formula 1 mm = 0.1 cm
Need the other direction? Centimeters to Millimeters.
How to convert Millimeters to Centimeters
The millimetre is one thousandth of a metre and is the usual unit for engineering tolerances. The centimetre is one hundredth of a metre and is common in clothing and furniture sizes.
To convert Millimeters to Centimeters, multiply the value in mm by 0.1. For example, 10 mm × 0.1 = 1 cm. This works because the ratio between the two units is constant for every value in length.
Worked examples
| mm | cm |
|---|---|
| 1 mm | 0.1 cm |
| 2.5 mm | 0.25 cm |
| 5 mm | 0.5 cm |
| 10 mm | 1 cm |
| 25 mm | 2.5 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
Reverse conversion
| cm | mm |
|---|---|
| 1 cm | 10 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1,000 mm |
When this conversion is useful
This is the calculation you need when you are working across metric and imperial measurements, shopping abroad or reading a spec sheet. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 mm is 100 cm.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
mm to cm conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 3 mm | 0.3 cm |
| 4 mm | 0.4 cm |
| 5 mm | 0.5 cm |
| 6 mm | 0.6 cm |
| 7 mm | 0.7 cm |
| 8 mm | 0.8 cm |
| 9 mm | 0.9 cm |
| 10 mm | 1 cm |
| 11 mm | 1.1 cm |
| 12 mm | 1.2 cm |
| 13 mm | 1.3 cm |
| 14 mm | 1.4 cm |
| 15 mm | 1.5 cm |
| 16 mm | 1.6 cm |
| 17 mm | 1.7 cm |
| 18 mm | 1.8 cm |
| 19 mm | 1.9 cm |
| 20 mm | 2 cm |
| 21 mm | 2.1 cm |
| 22 mm | 2.2 cm |
| 23 mm | 2.3 cm |
| 24 mm | 2.4 cm |
| 25 mm | 2.5 cm |
| 26 mm | 2.6 cm |
| 27 mm | 2.7 cm |
| 28 mm | 2.8 cm |
| 29 mm | 2.9 cm |
| 30 mm | 3 cm |
| 31 mm | 3.1 cm |
| 32 mm | 3.2 cm |
| 33 mm | 3.3 cm |
| 34 mm | 3.4 cm |
| 35 mm | 3.5 cm |
| 36 mm | 3.6 cm |
| 37 mm | 3.7 cm |
| 38 mm | 3.8 cm |
| 39 mm | 3.9 cm |
| 40 mm | 4 cm |
| 41 mm | 4.1 cm |
| 42 mm | 4.2 cm |
| 43 mm | 4.3 cm |
| 44 mm | 4.4 cm |
| 45 mm | 4.5 cm |
| 46 mm | 4.6 cm |
| 47 mm | 4.7 cm |
| 48 mm | 4.8 cm |
| 49 mm | 4.9 cm |
| 50 mm | 5 cm |
| 60 mm | 6 cm |
| 70 mm | 7 cm |
| 80 mm | 8 cm |
| 90 mm | 9 cm |
| 100 mm | 10 cm |
Frequently asked questions
How many Centimeters are in 1 Millimeters?
1 mm equals 0.1 cm.
How do I convert Millimeters to Centimeters?
Multiply the mm value by 0.1. Example: 25 mm = 2.5 cm.
What is 2.5 mm in cm?
2.5 mm = 0.25 cm.
Is the mm to cm conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.