Direct answer
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.