Centimeters to Millimeters Converter
Use this free centimeters to millimeters converter to get an exact answer as you type. 1 centimeter equals 10 millimeters, so the conversion is simple – the calculator also accepts fractions such as 5 3/8 and shows the result as a fraction of an inch when it helps.
How to convert centimeters to millimeters
- Type the length in centimeters into the Value box. Fractions like 3/8 and mixed numbers like 5 3/8 are accepted.
- Check that “From” shows centimeters and “To” shows millimeters. Use the swap button to reverse the direction.
- Read the exact answer instantly. Choose how many decimals you need, and copy the result with one tap.
The centimeters to millimeters formula
To convert centimeters to millimeters, multiply the number of cm by 10. In short: mm = cm × 10. Example: 25 cm = 250 mm.
Centimeters to millimeters conversion table
Look up the most common values below. For any other number, use the calculator above.
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 6 | 60 |
| 7 | 70 |
| 8 | 80 |
| 9 | 90 |
| 10 | 100 |
| 11 | 110 |
| 12 | 120 |
| 13 | 130 |
| 14 | 140 |
| 15 | 150 |
| 16 | 160 |
| 17 | 170 |
| 18 | 180 |
| 19 | 190 |
| 20 | 200 |
| 21 | 210 |
| 22 | 220 |
| 23 | 230 |
| 24 | 240 |
| 25 | 250 |
| 26 | 260 |
| 27 | 270 |
| 28 | 280 |
| 29 | 290 |
| 30 | 300 |
| 35 | 350 |
| 40 | 400 |
| 45 | 450 |
| 50 | 500 |
| 55 | 550 |
| 60 | 600 |
| 65 | 650 |
| 70 | 700 |
| 75 | 750 |
| 80 | 800 |
| 85 | 850 |
| 90 | 900 |
| 95 | 950 |
| 100 | 1,000 |
| 120 | 1,200 |
| 150 | 1,500 |
| 180 | 1,800 |
| 200 | 2,000 |
| 250 | 2,500 |
| 300 | 3,000 |
About these units
The centimeter (cm) is one hundredth of a meter. It is the everyday metric unit for body height, clothing, furniture and small objects.
The millimeter (mm) is one thousandth of a meter. It is the standard unit for precise measurements in engineering, woodworking, 3D printing and hardware.
Frequently asked questions
How many millimeters are in 1 cm?
1 cm = 10 mm. This factor is exact by definition.
How do I convert centimeters to millimeters?
Multiply the value in cm by 10. For example, 25 cm = 250 mm.
How many millimeters is 100 cm?
100 cm = 1,000 mm.
Is this centimeters to millimeters converter accurate?
Yes. It uses the exact international definitions (1 inch = 2.54 cm, 1 foot = 30.48 cm). Numbers are rounded only for display, and you can show up to 8 decimals.