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Convert centimeters to millimeters
Instant, accurate cm → mm conversion with a live converter, table and formula.
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1 centimeter = 10 millimeters
1 millimeter = 0.1 centimeters
centimeters to millimeters table
| centimeters (cm) | millimeters (mm) |
|---|---|
| 0.5 | 5 |
| 1 | 10 |
| 2 | 20 |
| 5 | 50 |
| 10 | 100 |
| 20 | 200 |
| 50 | 500 |
| 100 | 1000 |
| 500 | 5000 |
| 1000 | 10000 |
Formula
millimeters = centimeters × 10.
Example
10 centimeters = 100 millimeters.
What is a centimeter?
A centimeter (cm) is one-hundredth of a meter; roughly the width of a fingernail.
What is a millimeter?
A millimeter (mm) is one-thousandth of a meter — about the thickness of a credit-card edge.
Real-world reference points
A meter is about one long stride; a foot is a large shoe; an inch is the top joint of a thumb.
| Reference | centimeters | millimeters |
|---|---|---|
| Credit card width | 8.56 cm | 85.6 mm |
| Average adult height | 170 cm | 1,700 mm |
| Door height | 200 cm | 2,000 mm |
| Football (soccer) pitch length | 10,500 cm | 105,000 mm |
| Marathon distance | 4,220,000 cm | 42,200,000 mm |
Mistakes to avoid with length conversions
- Mixing unit systems mid-calculation — convert everything first, then do the math.
- Treating yards and meters as equal: a yard is ~8.6% shorter, which compounds over long distances.
- Rounding centimeters to inches too early when cutting materials — keep one extra decimal until the final cut.
Frequently asked questions
How many millimeters in a centimeters?+
1 centimeter = 10 millimeters.
How do I convert centimeters to millimeters?+
Enter the value in the centimeters box above and the millimeters value appears instantly. You can also type in the millimeters box to convert the other way.
Is this cm to mm converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.