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How Many Centimeters in an Inch? 1 in = 2.54 cm

1 inch equals exactly 2.54 centimeters. Quick size answer for screens, DIY, and clothing with converter links.

Question

How many centimeters are in an inch?

1 inch (in) equals exactly 2.54 centimeters (cm).

1 in

2.54 cm

12 in (1 ft)

30.48 cm

Formula

cm = inches × 2.54

Explanation

The international inch is defined as exactly 25.4 millimeters, so 1 in = 2.54 cm.

Multiply inches by 2.54 to get centimeters. Divide centimeters by 2.54 to get inches.

Example: 12 inches = 30.48 cm; a 27-inch monitor diagonal is about 68.58 cm.

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