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Inches to centimetres (in to cm)

Convert inches to centimetres (× 2.54 exactly), with a table covering fractions of an inch and common screen sizes.

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Centimetres = inches × 2.54, exactly. A quarter inch is 0.635 cm, a 12-inch pizza is 30.48 cm across and a 32-inch waist is 81.28 cm.

Screens are sold by their diagonal in inches everywhere, even in metric countries: a 6.1-inch phone is 15.49 cm corner to corner, a 15.6-inch laptop 39.62 cm, a 55-inch TV 139.7 cm. The table on this page includes these sizes. Note that the diagonal says nothing about width and height, which depend on the aspect ratio.

How to use it

  1. Type the value in the first box; the converted value appears in the second box as you type.
  2. Or type in the second box to convert the other way.
  3. Use the Decimals menu to round, and the quick-reference table for common values.

Frequently asked questions

How many cm is an inch?

Exactly 2.54 cm (25.4 mm).

How wide is a 55-inch TV in cm?

The 55 inches is the diagonal: 139.7 cm. For a 16:9 screen the visible width is about 121.8 cm and the height about 68.5 cm.

How do I convert fractions of an inch?

Convert the fraction to a decimal first: 3/8 in = 0.375 in = 0.9525 cm. The converter accepts decimals.

How do I convert feet and inches to cm?

Use the feet-and-inches to cm converter, which takes both numbers: 5 ft 9 in = 175.26 cm.

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