Centimeters to Millimeters
Convert centimeters to millimeters instantly, with a reference table.
Centimeters to Millimeters at a glance
Centimeters to Millimeters is a free online converter you can use right now to convert centimeters to millimeters instantly, with a reference table โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Unit Conversions
Centimeters to Millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1,000 mm |
| 500 cm | 5,000 mm |
| 1000 cm | 10,000 mm |
About Centimeters to Millimeters
Convert centimeters to millimeters instantly, with a reference table of common values. The factor is exact: 1 cm = 10 mm.
Used when a measurement needs the precision of millimetres โ technical drawings and manufacturing specifications are written in millimetres precisely to avoid decimal centimetres.
The centimetre is one hundredth of a metre, and the metre has been defined since 1983 as the distance light travels in a vacuum in 1/299,792,458 of a second โ a definition that ties it to a physical constant rather than to any object. It is the everyday metric unit for anything hand-sized: body measurements, clothing sizes, paper and furniture dimensions across most of the world. A credit card is 8.56 cm wide, and an adult of 5 feet 9 inches is about 175 cm tall.
Worked through with real numbers: 1 cm is 10 mm, 10 cm is 100 mm, 100 cm is 1000 mm.
As for the other side of the conversion: A credit card is 0.76 mm thick and a standard pencil lead is 0.7 mm across.
Length conversions between metric and imperial are exact by definition rather than approximate. The 1959 international yard and pound agreement fixed the inch at precisely 2.54 cm and the yard at 0.9144 m, so these factors are definitions and carry no measurement error.
How to use Centimeters to Millimeters
- Enter the number of centimeters you want to convert.
- The equivalent in millimeters appears instantly โ there is no button to press.
- Check the reference table for common Centimeters to Millimeters values.
Frequently asked questions
How do I convert centimeters to millimeters?
Multiply your centimeters figure by 10 to get millimeters โ or type a value above and read the answer straight off.
How many millimeters are in one centimeter?
1 cm = 10 mm.
When would I need to convert centimeters to millimeters?
Used when a measurement needs the precision of millimetres โ technical drawings and manufacturing specifications are written in millimetres precisely to avoid decimal centimetres.
What is a centimeter, exactly?
The centimetre is one hundredth of a metre, and the metre has been defined since 1983 as the distance light travels in a vacuum in 1/299,792,458 of a second โ a definition that ties it to a physical constant rather than to any object. A credit card is 8.56 cm wide, and an adult of 5 feet 9 inches is about 175 cm tall.
Where is the millimeter actually used?
It is the working unit of engineering drawings, machining and construction, where specifying in centimetres would introduce ambiguous decimal places. Technical drawings almost universally use millimetres without stating the unit. A credit card is 0.76 mm thick and a standard pencil lead is 0.7 mm across.
Is there anything tricky about length conversions?
Length conversions between metric and imperial are exact by definition rather than approximate. The 1959 international yard and pound agreement fixed the inch at precisely 2.54 cm and the yard at 0.9144 m, so these factors are definitions and carry no measurement error.
Is this converter accurate?
Yes. It uses the exact standard factor of 1 cm = 10 mm, and the conversion runs in your browser so nothing is uploaded.