How to use the inches to centimeters converter
Enter a length in inches. Multiply by 2.54 to convert to centimeters.
Inches to centimeters
The conversion factor is exact: one international inch is defined as exactly 2.54 centimeters.
Example: Mason converts a ruler measurement
Mason measures 12 inches. Since one international inch is exactly 2.54 centimeters, 12 × 2.54 = 30.48 centimeters.
A decimal inch is not feet-and-inches notation: 5.5 inches means five and a half inches. Convert any separate feet into inches before entering the total.
The inch-to-centimeter conversion is exact
One international inch equals exactly 2.54 centimeters. To convert inches to centimeters, multiply the inch value by 2.54.
Because the conversion factor is exact, any uncertainty comes from the original measurement or from rounding the displayed result rather than from the conversion relationship itself.
Common inches-to-centimeters conversions
1 inch
2.54 centimeters.
6 inches
15.24 centimeters.
12 inches
30.48 centimeters.
24 inches
60.96 centimeters.
Assumptions and limitations
What the estimate assumes
The numeric conversion is exact; measurement accuracy still depends on the original measurement.
Sources and reference material
Inches to Centimeters Converter FAQs
How many centimeters are in one inch?
Exactly 2.54 centimeters.
What is 6 inches in centimeters?
15.24 centimeters.
Can I enter decimal inches?
Yes.
Does the converter also show millimeters?
Yes.
How do I convert inches to centimeters?
Multiply the number of inches by 2.54.
Exact unit conversion; displayed decimals may be rounded for readability.