How to convert centimeters to millimeters
To convert centimeters to millimeters, multiply by 10. Length conversions are used everywhere from construction drawings and travel distances to sewing patterns and science homework.
Centimeter to Millimeter conversion table
| Centimeter (cm) | Millimeter (mm) |
|---|---|
| 0.1 cm | 1 mm |
| 0.5 cm | 5 mm |
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 4 cm | 40 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1,000 mm |
| 500 cm | 5,000 mm |
| 1,000 cm | 10,000 mm |
About the units
Centimeter (cm)
A centimeter is one hundredth of a meter, widely used for body height, clothing sizes and everyday measurements outside the US.
Millimeter (mm)
A millimeter is one thousandth of a meter. It is the standard unit on engineering drawings, rulers and screw sizes.
How to use this converter
- Type the number of centimeters (cm) in the input box.
- The result in millimeters appears instantly — no button needed.
- See the same value in every other length unit just below.
- Use “Swap units” to convert millimeters back to centimeters.
When you’ll use the centimeter to millimeter conversion
Converting centimeters to millimeters comes up more often than you might expect — for example when measuring furniture to see if it fits through a doorway, reading a product spec sheet from another country, or checking a running or cycling route distance. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 cm = 10 mm.
Watch out for these mix-ups
- Confusing the international mile with the nautical mile (1,852 m).
- Writing 5′10″ as 5.10 ft — it is actually about 5.83 ft.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many millimeters are in one centimeter?
One centimeter equals 10 millimeters. 10 is the exact factor used by this converter.
How do I convert centimeters to millimeters?
Multiply the value in centimeters by 10. To go the other way, multiply millimeters by 0.1.
What is 10 cm in mm?
10 cm = 100 mm. Also, 5 cm = 50 mm and 100 cm = 1,000 mm.
What is the difference between a centimeter and a millimeter?
A centimeter is one hundredth of a meter, widely used for body height, clothing sizes and everyday measurements outside the US. A millimeter is one thousandth of a meter. It is the standard unit on engineering drawings, rulers and screw sizes.
Is this tool free and private?
Yes — the Centimeter to Millimeter is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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