Inches to cm Converter
Convert inches to centimeters and back, with a reference chart and screen sizes.
Accepts decimals (5.5), fractions (3/4, 5 1/2) and 5½.
Result
Rounded to 1/16 inch, the usual tape-measure marking.
| Inches | cm | mm |
|---|---|---|
| 1" | 2.54 | 25.4 |
| 2" | 5.08 | 50.8 |
| 3" | 7.62 | 76.2 |
| 4" | 10.16 | 101.6 |
| 5" | 12.7 | 127 |
| 6" | 15.24 | 152.4 |
| 7" | 17.78 | 177.8 |
| 8" | 20.32 | 203.2 |
| 9" | 22.86 | 228.6 |
| 10" | 25.4 | 254 |
| 11" | 27.94 | 279.4 |
| 12" | 30.48 | 304.8 |
| Inches | Fraction | cm | mm |
|---|---|---|---|
| 0.125" | 1/8" | 0.3175 | 3.175 |
| 0.25" | 1/4" | 0.635 | 6.35 |
| 0.5" | 1/2" | 1.27 | 12.7 |
| 0.75" | 3/4" | 1.905 | 19.05 |
| 15" | 15" | 38.1 | 381 |
| 18" | 18" | 45.72 | 457.2 |
| 20" | 20" | 50.8 | 508 |
| 24" | 24" | 60.96 | 609.6 |
| 30" | 30" | 76.2 | 762 |
| 36" | 36" | 91.44 | 914.4 |
| 48" | 48" | 121.92 | 1219.2 |
| 60" | 60" | 152.4 | 1524 |
How do I convert inches to cm online?
There are exactly 2.54 centimeters in one inch, which is also 25.4 millimeters. That figure is set by definition, not measured, so it never changes. To convert inches to cm, multiply by 2.54; to convert cm to inches, divide by 2.54. This converter does both directions live: type in either box and the other updates instantly. It accepts decimals and fractions such as 5 1/2, 3/4 or 5½, which is how most US tape measures and hardware sizes are written. Going from cm to inches, it shows the decimal value and the nearest 1/16 inch fraction so you can read it straight off a ruler. You also get an inches-to-cm chart for 1 to 12 inches, common measurements, and a Screens tab that turns a TV or monitor diagonal into centimeters plus an approximate width and height. Everything runs in your browser, it is free, needs no sign-up, and your measurements never leave your device.
How to use Inches to cm Converter
- Type your measurement in inches in the left box. Decimals (5.5), fractions (3/4) and mixed numbers (5 1/2 or 5½) all work.
- Read the result in centimeters and millimeters, updated as you type. To go the other way, type cm in the right box and you will get inches as a decimal and as a fraction.
- Check the nearest fraction if you are working with a tape measure: it is rounded to 1/16 inch and marked with ≈ when it is not exact.
- Click any result to copy it with its unit, or use the Copy button to grab the whole equivalence as one line.
- For a screen, open the Screens tab, enter the diagonal (or pick 24, 27, 55, 65…) and choose an aspect ratio (16:9, 21:9, 16:10 or 4:3) to see the approximate width and height in cm.
Common use cases
Checking if a TV fits your stand
A 55-inch TV has a 139.7 cm diagonal and, at 16:9, about 121.8 × 68.5 cm of picture. Compare that with your stand or wall space, and allow extra for the bezel and feet.
Reading an inches-only size chart
Pants waists and inseams are listed in inches. A 32-inch waist is 81.28 cm, so you can match it against a measuring tape in centimeters before ordering.
Hardware, plumbing and DIY parts
Drill bits, bolts and pipes come in fractions such as 3/4 inch (1.905 cm). Type the fraction as written and get millimeters to find the closest metric part.
Printing photos and framing
A 4 × 6 inch print is 10.16 × 15.24 cm. Convert paper and frame sizes before cutting a mat or setting up a document in a program that works in centimeters.
Laptops, tablets and luggage specs
Spec sheets list screens and bags in inches: a 15.6-inch laptop screen is 39.6 cm on the diagonal. Convert it to check whether the device fits your backpack or an airline limit.
Frequently asked questions
How many cm are in an inch?
One inch is exactly 2.54 cm, or 25.4 mm. The value was fixed by international agreement in 1959, so it is the same everywhere. That makes 10 inches 25.4 cm and 12 inches 30.48 cm.
How do I convert inches to cm in my head?
Multiply by 2.5 for a quick estimate: 10 inches is about 25 cm, an error of roughly 2%. For the exact figure, multiply by 2.54 or paste the measurement into this converter, which also understands fractions.
How do I convert 5 1/2 inches to cm?
Type 5 1/2 (or 5½, or 5.5) in the inches box. The result is 13.97 cm, which is 139.7 mm. The tool reads the fraction as 5.5 and multiplies it by 2.54.
How big is a 55-inch TV in cm?
The diagonal is 139.7 cm. On a 16:9 screen that works out to roughly 121.8 cm wide by 68.5 cm tall for the picture alone, without the bezel. Manufacturers round the diagonal, so treat these as a guide and confirm the exact size on the model's spec sheet.
How do I convert cm to inches and get a fraction?
Type the centimeters in the right box. You will see the inch value as a decimal (10 cm is 3.937008 in) and the nearest 1/16 fraction (3 15/16). The fraction is an approximation, so it is marked with ≈ whenever it differs from the decimal.
Can I convert other units, like feet or pounds?
Yes, but not here: this tool only covers inches and cm. Docuboxer's unit converter at /en/units handles length, weight, temperature and more, and our inches-to-cm guide has more examples, including why screen sizes confuse people. Nothing you type ever leaves your browser.