Centimeters to Millimeters
A centimeter is one hundredth of a meter, commonly used for paper sizes and human height in metric countries. A millimeter is one thousandth of a meter, the standard unit on rulers and rainfall gauges worldwide. 1 cm equals 10 mm, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to length, measured here against length's base unit (m) — every other length unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
mm = cm × 10
cm = mm × 0.1
Worked example: 5 cm × 10 = 50 mm.
Conversion table
| Centimeter (cm) | Millimeter (mm) |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 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 |
| 250 cm | 2,500 mm |
| 500 cm | 5,000 mm |
| 1,000 cm | 10,000 mm |
Frequently asked
- How many Millimeters in a centimeter?
- 1 cm equals 10 mm.
- How do I convert Centimeters to Millimeters?
- Multiply the value in cm by 10 to get mm. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Centimeter and Millimeter are both defined by a fixed conversion factor to length's base unit (m), so the result shown is exact to the precision displayed, not an approximation.