Convert inches to centimeters instantly, perfect for screen sizes, dimensions, and quick measurements.
To convert inches to centimeters, multiply the inch value by 2.54.
Learn the exact imperial-to-metric length conversion ratio, TV & display diagonal conversion charts, construction lumber sizing, and mental calculation shortcuts.
Quick reference values for blueprints, apparel, screen diagonals, and carpentry.
In construction engineering, international architectural plans specified in imperial inches must often be translated into metric millimeters and centimeters for global fabrication.
To rapidly estimate inches to centimeters in your head:
Multiply the inch value by 2.5, then add 1% of the total.
Example for 10 inches: Multiply by 2.5 = 25 → Add 1% (0.4) = 25.4 cm (Exact match!).
Since 1 inch is defined as exactly 2.54 centimeters, converting inches to centimeters means multiplying the inch value by 2.54, written as Centimeters = Inches x 2.54. This ratio is exact, not rounded, so results scale precisely at any size.
The 1959 International Yard and Pound Agreement standardized the inch as exactly 2.54 centimeters, replacing slightly different national definitions that existed before. Because an inch is larger than a centimeter, converting inches to centimeters always produces a larger number than the original inch value.
Convert a 55-inch TV screen diagonal by multiplying 55 by 2.54, which gives 139.7 centimeters. The same formula shows that a 12-inch ruler (1 foot) measures exactly 30.48 centimeters.
This tool is useful for translating architectural blueprints, electronics screen sizes, and fabric or paper measurements from imperial to metric units. Use the CM to Inches Converter for the reverse direction, or the Length Converter when other metric-to-imperial distance units are needed.
Quick answers about how this tool works.
12 inches (1 foot) is equal to exactly 30.48 cm.
60 inches is equal to 152.4 cm.
65 inches (TV screen size) is equal to 165.1 cm.
Convert the fraction to decimal first (e.g., 5 1/2 inches = 5.5 inches) and then multiply by 2.54 (5.5 × 2.54 = 13.97 cm).
32 inches is equal to 81.28 cm.
Plain-language explainers that sit next to this tool.
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