About Centimeters to Millimeters Converter
This converter turns centimeters into millimeters. One centimeter is 10 millimeters. It is free, needs no sign-up and runs in your browser, so nothing you enter is uploaded.
To convert by hand, multiply the number of centimeters by 10. For example, 10 cm × 10 = 100 mm. To go back, multiply millimeters by 0.1.
One centimeter is 0.01 m. Every length unit here is defined from the meter: 1 inch is exactly 25.4 mm, 1 foot is exactly 0.3048 m, 1 mile is exactly 1,609.344 m and 1 nautical mile is exactly 1,852 m. The factor on this page is therefore exact, and only the displayed digits are rounded.
How to use Centimeters to Millimeters Converter
- Choose a group such as Length or Temperature from the Quantity picker. It opens on a worked conversion.
- Type the value you want to convert in the From box. Decimals and negative numbers are fine.
- Pick the unit you have in the From list and the unit you want in the To list. The swap button reverses the pair.
- Read the result in the result card, and use the copy button to put it on your clipboard.
- Set Precision to Auto, or to a fixed number of decimals from 0 to 10, if you need a specific rounding.
- Check the formula line and the chart of common values under the result when you want to see how the number was reached.
Features
- 102 units in 15 groups, from nanometers and light-years to square miles, and from bits to tebibytes. It includes milligrams, UK gallons and pints, cubic meters, feet and inches, degrees and radians, hertz and rpm, and bits per second to MB/s.
- Results update as you type, with a swap button to reverse the pair.
- Precision control: Auto (up to 8 significant digits) or 0 to 10 fixed decimals.
- A copy button for the result.
- The formula and the factor in both directions, shown under the result.
- A chart of common values (1, 2, 5, 10, 20, 25, 50, 75, 100, 250, 500 and 1,000) for the pair you chose.
- Temperature handled with proper offset formulas, plus the UK gas mark oven table.
- Fuel economy handled as an inverse, so US and UK miles per gallon and liters per 100 km convert correctly.
- Bangladesh land units: decimal (shotangsho), katha and bigha.
- Both decimal data units (KB, MB, GB, TB) and binary ones (KiB, MiB, GiB, TiB), clearly labeled.
Centimeters to millimeters formula
To convert centimeters to millimeters, multiply the value by 10.
To go the other way, multiply millimeters by 0.1, which is the same as dividing by 10.
mm = cm × 10Worked examples
10 cm gives 100 mm
10 × 10 = 100
40 cm gives 400 mm
40 × 10 = 400
170 cm gives 1,700 mm
170 × 10 = 1,700
Centimeters to millimeters conversion chart
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 25 | 250 |
| 30 | 300 |
| 40 | 400 |
| 50 | 500 |
| 60 | 600 |
| 100 | 1,000 |
| 150 | 1,500 |
| 170 | 1,700 |
| 180 | 1,800 |
| 200 | 2,000 |
Privacy: how it works
- Every conversion is calculated by code running in your browser tab. The values you type are never sent to Ulkaa or anyone else, and nothing is stored.
- There is no account and no sign-up for this tool, and it costs nothing to use.
Tips
- Use the swap button instead of retyping when you need the reverse conversion.
- For a quick mental check, round the factor: 1 inch is about 2.5 cm, 1 kg is about 2.2 lbs, 1 mile is about 1.6 km.
- Set Precision to 2 decimals for cooking, shopping and travel, and to 6 or more for engineering work.
- Check whether a figure uses US or imperial units before converting volumes, gallons and miles per gallon.
- For land, convert for a rough size, then confirm the area from the deed or survey record.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial and no credit card. Ulkaa Tool does the work with your own device, so there is no server bill to pass on to you.
Do I need an account?
No. There is no sign-up and no login. Open the page and use it. An Ulkaa account is not needed for anything on this tool.
Does it run in my browser?
Yes. Your values are processed by code running in your browser tab, on your own device.
Is my data uploaded?
No. Your values are never sent to Ulkaa or to anyone else. You can check this yourself by watching the Network tab in your browser developer tools while you use the tool.
How many millimeters are in a centimeter?
One centimeter is 10 millimeters.
How many centimeters are in a millimeter?
One millimeter is 0.1 centimeters.
How do I convert centimeters to millimeters by hand?
Multiply the value in centimeters by 10. For example, 10 cm is 100 mm. To reverse it, divide by 10.
Is the centimeter to millimeter factor exact?
Yes. Length units are defined from the meter, and 1 centimeter is exactly 0.01 m. The digits you see on this page are rounded for display only.
More Unit Converter pages
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