How to convert centimeters to millimeters
Centimeters and Millimeters both measure length, so converting is a single multiplication. One cm equals 10 mm, so you multiply your centimeters value by 10.
Formula: millimeters = centimeters × 10. For example, 10 cm = 100 mm.
Centimeters to Millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 5 | 50 |
| 10 | 100 |
| 25 | 250 |
| 50 | 500 |
| 100 | 1,000 |
| 1,000 | 10,000 |
Centimeters and Millimeters explained
Centimeters (cm): One-hundredth of a metre, common for body measurements, paper sizes and everyday lengths.
Millimeters (mm): One-thousandth of a metre, used for small, precise measurements like rainfall or engineering tolerances.
When you'd convert centimeters to millimeters
You'll convert centimeters to millimeters whenever a measurement is given in one unit but you need it in the other — comparing centimeters and millimeters figures across regions, following a recipe or spec, or double-checking a number. Because 1 cm is exactly 10 mm, the result is precise every time.
Frequently asked questions
How many millimeters are in a centimeter?
One cm equals 10 mm. Multiply your centimeters figure by 10 to get millimeters.
What is the formula to convert centimeters to millimeters?
millimeters = centimeters × 10. The factor 10 is exact.
What is 2 centimeters in millimeters?
2 cm = 20 mm. You can enter any value in the converter above to get an instant result.
Is this Centimeters to Millimeters converter accurate?
Yes. It uses the standard conversion factor (1 cm = 10 mm) defined by BIPM — SI Brochure (definition of the metre), so results are exact to several decimal places.