Inches to cm Converter
Convert inches to centimeters for screen sizes, clothing, and international product dimensions.
How It Works
Formula: in to cm = value × 2.54
Example: 10 in = 25.4 cm
Note: 1 inch equals exactly 2.54 centimeters by the international definition adopted in 1959.
Common Uses
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 cm
Precision Guidance
For everyday use, round to 1 decimal place. For engineering, keep 2-4 decimals.
Common Mistakes
The inch-to-cm factor is exact (2.54), not an approximation. Use 2.54, not 2.5, for accuracy.
Frequently Asked Questions
What is 1 inch in cm?
1 inch equals exactly 2.54 centimeters by international definition.
How do I convert inches to cm?
Multiply the inch value by 2.54. For example, 10 in × 2.54 = 25.4 cm.
Why is 2.54 the conversion factor?
Since 1959, the inch has been legally defined as exactly 2.54 cm worldwide.
Is this used for screen sizes?
Yes, TV and monitor screens are measured in inches diagonally; this converts them to centimeters.
Deep Dive Guide
Inches to CM: Complete Conversion Guide for US Measurements
Convert inches to cm with the exact 2.54 factor. Our 2026 guide covers screen sizes, furniture, and product specs for US shoppers.
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Last Updated 2026 | This converter was reviewed for accuracy