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Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
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PDF, Word, Excel, PowerPoint, OpenDocument and RTF documents, JPG, PNG, WebP, HEIC, AVIF, GIF and BMP images, MP4, MOV, WebM and MKV videos, MP3, WAV, M4A, OGG and FLAC audio, ZIP, 7z, RAR, TAR and GZIP archives, CSV, JSON, XML and plain text. Each tool lists exactly what it opens.
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CM to Inches Converter
Convert centimetres to inches instantly, with the exact formula and a cm to inches chart.
Type a length in centimetres and the converter shows it in inches as you type. It also lists the same length in millimetres, metres, feet and every other length unit, so you never have to convert twice.
Centimetres are used for most measurements around the world, while inches are still standard for screens, clothing sizes, tyres, paper and many products sold in the United States. This page is set up for centimetres to inches; the swap button turns it into inches to centimetres.
How to use CM to Inches Converter
- Enter the length in centimetres (for example 10).
- Read the result in inches straight away.
- Use the swap button to convert inches back to centimetres.
- Share the page link: it keeps your numbers.
How to convert centimetres to inches
An inch is defined as exactly 2.54 centimetres, so to convert centimetres to inches you divide by 2.54. For example, 10 cm divided by 2.54 is about 3.937 inches, and 30 cm is about 11.811 inches.
For a quick estimate in your head, multiply the centimetres by 0.4: 10 cm is roughly 4 inches. The converter always uses the exact definition, so its answer is precise to many decimal places.
Centimetres to inches chart
Common lengths, rounded to three decimal places.
| Centimetres | Inches |
|---|---|
| 1 | 0.394 |
| 2 | 0.787 |
| 5 | 1.969 |
| 10 | 3.937 |
| 15 | 5.906 |
| 20 | 7.874 |
| 25 | 9.843 |
| 30 | 11.811 |
| 40 | 15.748 |
| 50 | 19.685 |
| 60 | 23.622 |
| 70 | 27.559 |
| 80 | 31.496 |
| 90 | 35.433 |
| 100 | 39.37 |
| 150 | 59.055 |
Where you meet centimetres and inches
Screen sizes for phones, laptops and televisions are measured diagonally in inches almost everywhere, even in countries that use the metric system. Clothing sizes for jeans use inches for waist and leg length, and many online shops list product dimensions in both units.
Height is the other everyday case: a person who is 170 cm tall is about 66.929 inches, which is 5 feet and about 6.9 inches. The converter shows feet as well, so you can read both at once.
Accuracy and rounding
The converter keeps up to ten significant digits, so results such as 3.937007874 inches are shown in full and you decide how to round. For sewing and woodwork, one decimal place in inches is usually enough; for engineering drawings keep two or three.
A number written with a decimal comma, such as 12,5, is understood as well.
Frequently asked questions
How many inches are in one centimetre?
One centimetre is about 0.3937 inches, because an inch is exactly 2.54 centimetres.
What is the formula for cm to inches?
Inches = centimetres ÷ 2.54. For example, 25 cm ÷ 2.54 is about 9.843 inches.
Is 2.54 exact?
Yes. Since 1959 the international inch has been defined as exactly 2.54 centimetres, so the conversion has no rounding in the definition itself.
How do I convert inches back to centimetres?
Multiply by 2.54, or press the swap button in the converter to change the direction.
Can I convert millimetres to inches here?
Yes. Choose millimetres as the from unit; the result is still shown in inches, and 25.4 mm is exactly one inch.
Does the converter work offline?
Once the page has loaded, the conversion happens in your browser on your device, so it keeps working without a connection.
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