Centimeters to Millimeters Converter
Convert centimeters to millimeters instantly with this free centimeters to millimeters converter. Enter any value to get an accurate length conversion, plus the formula, the conversion factor and a full reference table.
What is 1 centimeter in millimeters?
1 centimeter is equal to exactly 10 millimeters.
1 × 10 = 10 millimeters
1 centimeter = 10 millimeters
Centimeters to Millimeters formula
mm = cm × 10
The centimeters to millimeters conversion factor is 10, which is exact by definition. 1 centimeter = 10 millimeters, and 1 millimeter = 0.1 centimeters.
Worked examples
- 2 centimeters = 20 millimeters — 2 × 10 = 20 millimeters
- 6 centimeters = 60 millimeters — 6 × 10 = 60 millimeters
- 10 centimeters = 100 millimeters — 10 × 10 = 100 millimeters
Centimeters to Millimeters conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 4 cm | 40 mm |
| 5 cm | 50 mm |
| 6 cm | 60 mm |
| 7 cm | 70 mm |
| 8 cm | 80 mm |
| 9 cm | 90 mm |
| 10 cm | 100 mm |
| 12 cm | 120 mm |
| 15 cm | 150 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 30 cm | 300 mm |
| 50 cm | 500 mm |
| 75 cm | 750 mm |
| 100 cm | 1,000 mm |
| 500 cm | 5,000 mm |
| 1,000 cm | 10,000 mm |
When you need to convert centimeters to millimeters
- Buying furniture, TVs or appliances listed in one system and fitting them into a room measured in the other.
- Following building plans, sewing patterns or DIY instructions written abroad.
- Reading height, screen size or luggage limits when travelling between the US and the rest of the world.
Getting a feel for the scale
A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.
Centimeter (cm)
- A standard pencil is about 19 cm long
- A US letter page is 21.6 cm wide
Millimeter (mm)
- A credit card is 0.76 mm thick
- A UK 1p coin is about 1.5 mm thick
Common mistakes to avoid
- Dividing when you should multiply. Because 1 centimeter = 10 millimeters, the answer should be larger than the number you started with.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
For everyday measurements round to the nearest whole unit or to one decimal place. Machining, sewing and construction usually need at least two decimals — and it is worth measuring in the target unit directly when tolerance matters.
How these units are defined
- Centimeter (cm): One hundredth of a meter, widely used for body and object measurements. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Millimeter (mm): One thousandth of a meter; the standard fine unit on metric rulers. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
Frequently asked questions
- What is 1 centimeter in millimeters?
- 1 centimeter is equal to 10 millimeters.
- How many centimeters are in one millimeter?
- There are 0.1 centimeters in 1 millimeter.
- How do you convert centimeters to millimeters?
- Multiply the number of centimeters by 10 — or use the formula mm = cm × 10.
- What is 6 centimeters in millimeters?
- 6 centimeters is 60 millimeters. 6 × 10 = 60 millimeters.
- Is the centimeters to millimeters conversion exact?
- Yes. The relationship is fixed by definition, so 10 is an exact conversion factor — only the displayed result is rounded.