About Inches to Centimeters Converter
This converter turns inches into centimeters. One inch is 2.54 centimeters. 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 inches by 2.54. For example, 10 in × 2.54 = 25.4 cm. To go back, multiply centimeters by 0.39370079. For a rough mental estimate, multiply by about 2.5, which is off by about 1.6 percent.
One inch is 0.0254 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.
Since 1959 the inch has been defined as exactly 2.54 centimeters, so this conversion has no rounding error: the result is exact before any display rounding.
Common sizes: US Letter paper is 8.5 × 11 inches, which is 21.59 × 27.94 cm. A 24 inch monitor measures 60.96 cm along the diagonal.
How to use Inches to Centimeters 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.
Inches to centimeters formula
To convert inches to centimeters, multiply the value by 2.54.
To go the other way, multiply centimeters by 0.39370079, which is the same as dividing by 2.54.
cm = in × 2.54Worked examples
10 in gives 25.4 cm
10 × 2.54 = 25.4
20 in gives 50.8 cm
20 × 2.54 = 50.8
66 in gives 167.64 cm
66 × 2.54 = 167.64
Inches to centimeters conversion chart
| Inches (in) | Centimeters (cm) |
|---|---|
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 4 | 10.16 |
| 5 | 12.7 |
| 6 | 15.24 |
| 7 | 17.78 |
| 8 | 20.32 |
| 9 | 22.86 |
| 10 | 25.4 |
| 12 | 30.48 |
| 15 | 38.1 |
| 20 | 50.8 |
| 24 | 60.96 |
| 30 | 76.2 |
| 36 | 91.44 |
| 48 | 121.92 |
| 60 | 152.4 |
| 66 | 167.64 |
| 72 | 182.88 |
| 100 | 254 |
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 centimeters are in an inch?
One inch is 2.54 centimeters.
How many inches are in a centimeter?
One centimeter is 0.393701 inches.
How do I convert inches to centimeters by hand?
Multiply the value in inches by 2.54. For example, 10 in is 25.4 cm. To reverse it, divide by 2.54.
Is the inch to centimeter factor exact?
Yes. Length units are defined from the meter, and 1 inch is exactly 0.0254 m. The digits you see on this page are rounded for display only.
How many cm is 5 feet 8 inches?
5 feet 8 inches is 68 inches, which is 172.72 cm.
How many cm is 6 feet?
6 feet is 72 inches, which is 182.88 cm.
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