Inches to Centimeters Calculator
Convert inches to centimeters instantly.
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Enter your values and click Calculate
How It Works
Centimeters = Inches × 2.54. The factor 2.54 is exact by international definition. In 1959, the United States, United Kingdom, Canada, Australia, and other countries signed the International Yard and Pound Agreement, which defined one inch as exactly 2.54 centimeters. Because the conversion factor is an exact rational number, the only rounding in this calculator comes from the display limit of four decimal places. For whole-number inch values that divide evenly — like 1 inch (2.54 cm), 10 inches (25.4 cm), or 100 inches (254 cm) — the result is exact. For fractional inputs, the result is an exact decimal truncated for display.
Examples
One Foot
Converting 12 inches (one foot) to centimeters.
Result: 12 in = 30.48 cm.
Laptop Screen
A 15.6-inch screen diagonal expressed in centimeters.
Result: 15.6 in = 39.624 cm.
Average Height
Converting 70 inches (5 feet 10 inches) to centimeters.
Result: 70 in = 177.8 cm.
Frequently Asked Questions
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. This is a defined constant, not a rounded approximation.
How do I convert height in feet and inches?
First convert feet to inches (multiply by 12), add the remaining inches, then multiply the total by 2.54.
Is this useful for clothing sizes?
Yes. Many international clothing size charts use centimeters for measurements like waist, chest, and inseam.