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Centimeters to inches converter

Convert centimeters to inches and back, with a chart of common values. 1 inch = 2.54 cm exactly. Free and instant.

  • Free
  • No sign-up
  • No file uploaded
  • Windows, Mac, Android, iPhone

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About this tool

Inches measure screens, wheels, jeans and pipes in many countries and on product sheets worldwide. Type a length in centimeters to get it in inches, or switch the direction in one click.

When to use it

Choosing a screen or TV

A diagonal given in inches becomes concrete in centimeters: 55 inches is 139.7 cm.

Buying clothes or wheels

Jeans waist sizes (W32 = 81.3 cm), rim or bike wheel diameters: they are all in inches.

DIY and plans

Screws, pipes, boards or plans from foreign manufacturers are often given in inches.

How to use

  1. Type a value in centimeters.
  2. Read the result in inches, neatly rounded.
  3. Click ⇄ to convert inches to centimeters.

How it works

An inch is defined as exactly 2.54 cm. The tool divides the centimeter value by 2.54, then rounds the display to avoid floating-point errors.

The chart of common values and the list of every length unit (mm, m, feet, yards…) update as you type, right in your browser.

Tips for best results

  • For a quick estimate, multiply centimeters by 0.4.
  • A screen size is a diagonal: measure from corner to corner.
  • Jeans W/L sizes are in inches: W for the waist, L for the leg length.
  • For feet and inches (5'7"), convert each part and add them up.

Common problems and fixes

The result has many decimals

Inches rarely come out round: round to one decimal for everyday use.

My value isn't accepted

Type only the number, without the unit. Commas and points both work.

I want inches to centimeters

Click the ⇄ button: the direction and the chart switch.

Frequently asked questions

How many centimeters are in an inch?

Exactly 2.54 cm. The value was fixed by an international agreement in 1959: 1 inch = 25.4 mm.

How do I convert cm to inches in my head?

Divide by 2.54, or multiply by 0.4 for a quick estimate: 30 cm is about 12 inches (11.81 exactly).

How big is a 15.6-inch screen?

Its diagonal is 15.6 × 2.54 = 39.6 cm. Screen sizes are always measured diagonally.

Can I type a comma?

Yes, both a comma and a point work as the decimal separator.

Related searches

Still stuck?

Ask on the forum: the category, the tool, your device sheet and the test result will be filled in for you.