Convert Inches to Centimeters
1 in = 2.54 cm. Multiply the length in inches by 2.54 to get centimeters. This is an exact definition.
Inches
in
Centimeters
cm
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How to Convert Inches to Centimeters
Multiply the length in inches by 2.54 to get centimeters. This is an exact definition.
Common Inches to Centimeters Values
Frequently Asked Questions
Why is 1 inch exactly 2.54 cm?
By international agreement since 1959, the inch is defined as exactly 25.4 millimeters (2.54 cm). This is an exact, not approximate, conversion.
How many cm is a 55-inch TV?
A 55-inch TV screen measures 139.7 cm diagonally. This is the screen diagonal, not the width — the actual width depends on the aspect ratio.
How do I convert fractional inches to cm?
Convert the fraction to a decimal first, then multiply by 2.54. For example, 3/8 inch = 0.375 in × 2.54 = 0.9525 cm.
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