Inches are widely used in the United States, Canada, and the UK for small measurements (like screen sizes or paper dimensions). However, most of the world relies on centimeters. Use this tool to bridge the gap.
The Exact Formula
Converting inches to centimeters is mathematically exact. The formula is: Centimeters = Inches × 2.54. Our calculator handles the math so you don't have to!
Worked Example
To convert 10 inches to centimeters: 10 × 2.54 = 25.4 cm. For a common real-world example, a standard 15-inch laptop screen measures 15 × 2.54 = 38.1 cm diagonally.
Common Inches to CM Conversions
1 inch = 2.54 cm
6 inches = 15.24 cm
12 inches (1 foot) = 30.48 cm
18 inches = 45.72 cm
24 inches = 60.96 cm
36 inches (1 yard) = 91.44 cm
If you're converting a height or a longer distance measured in feet and inches together, our Feet to CM Converter and Meters to Feet Converter handle those units directly without needing to add inches by hand.
Frequently Asked Questions
One inch is exactly 2.54 centimeters.
Simply multiply the length in inches by 2.54. For example, 10 inches is equal to 25.4 centimeters.
Yes. In 1959, the international yard and pound agreement officially defined the inch as exactly 25.4 millimeters, which is 2.54 cm.
Divide the length in centimeters by 2.54. For example, 25.4 cm divided by 2.54 equals exactly 10 inches. You can also just swap the units in the calculator above.
One centimeter is approximately 0.3937 inches.
The United States has never fully adopted the metric system for everyday use, and inches remain standard for things like screen sizes, paper dimensions, and construction. The UK uses a mix of both systems, with inches still common informally.
Multiply by 2.5 as a rough shortcut instead of 2.54 — it's close enough for quick estimates, though you should use the exact 2.54 factor for anything that needs to be precise.