1 centimeter = 10 millimeters
All conversions
| Unit | Symbol | Value |
|---|
Quick answer
To convert centimeters to millimeters, multiply the number of centimeters by 10. For example, 2.5 centimeters = 25 millimeters.
Full guide
Length Conversion Guide: Feet to Meters, CM to Inches and More
Read the guide
How to Convert CM to MM
The formula is millimeters = centimeters × 10. 1 centimeter = 10 millimeters. Type any value in the converter above for an instant answer, or use the chart below for the most common values.
This page is preset for centimeter to millimeter conversions, but you can switch either list to any of the 92 units in the Length Converter, or go the other way with the MM to CM converter.
CM to MM conversion chart
| CM | MM |
|---|---|
| 0.1 cm | 1 mm |
| 0.25 cm | 2.5 mm |
| 0.5 cm | 5 mm |
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 2.5 cm | 25 mm |
| 3 cm | 30 mm |
| 4 cm | 40 mm |
| 5 cm | 50 mm |
| 6 cm | 60 mm |
| 7 cm | 70 mm |
| 8 cm | 80 mm |
| 9 cm | 90 mm |
| 10 cm | 100 mm |
| 11 cm | 110 mm |
| 12 cm | 120 mm |
| 13 cm | 130 mm |
| 14 cm | 140 mm |
| 15 cm | 150 mm |
| 16 cm | 160 mm |
| 17 cm | 170 mm |
| 18 cm | 180 mm |
| 19 cm | 190 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 30 cm | 300 mm |
| 40 cm | 400 mm |
| 50 cm | 500 mm |
| 60 cm | 600 mm |
| 70 cm | 700 mm |
| 75 cm | 750 mm |
| 80 cm | 800 mm |
| 90 cm | 900 mm |
| 100 cm | 1,000 mm |
| 150 cm | 1,500 mm |
| 200 cm | 2,000 mm |
| 250 cm | 2,500 mm |
| 500 cm | 5,000 mm |
| 1,000 cm | 10,000 mm |
Common CM to MM conversions
- 1 centimeter = 10 millimeters
- 1 cm = 10 mm
- 2.5 cm = 25 mm
- 5 cm = 50 mm
- 10 cm = 100 mm
- 30 cm = 300 mm
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How to Use the CM to MM Converter
- Type a value in the From box and choose its unit.
- Pick the unit you want in the To list — the result updates as you type.
- Use the swap button to reverse the conversion, or type in the To box to convert backwards.
- Check the All conversions table to see your value in every unit; click a row to make it the target.
Frequently Asked Questions
How many millimeters are in a centimeter?
There are 10 millimeters in 1 centimeter. Going the other way, 1 millimeter = 0.1 centimeters.
How do I convert CM to MM?
Use the formula millimeters = centimeters × 10. For example, 1 centimeter = 10 millimeters. Or type the value in the converter above and the answer appears as you type.
What is the CM to MM formula?
millimeters = centimeters × 10 — the conversion factor is exact, using the international definitions of both units.
What is 1 centimeter in millimeters?
1 centimeter = 10 millimeters.
What is 2.5 centimeters in millimeters?
2.5 centimeters = 25 millimeters.
What is 5 centimeters in millimeters?
5 centimeters = 50 millimeters.
What is 10 centimeters in millimeters?
10 centimeters = 100 millimeters.
What is 30 centimeters in millimeters?
30 centimeters = 300 millimeters.
How do I convert MM back to CM?
Use the swap button in the converter above, or open our MM to CM converter. centimeters = millimeters ÷ 10.
Is this CM to MM converter accurate?
Yes. It uses exact unit definitions and double-precision maths, and you can show up to 15 significant digits. The table below is calculated with the same formula.
Can I convert CM to other length units?
Yes — pick any unit in the From and To lists above, or open the full Length Converter, which handles 92 length units.
Is the CM to MM converter free?
Yes, it is free with no sign-up, and every conversion runs in your browser so nothing is sent to a server.