Quickly convert inches (in) to centimeters (cm) with our free tool. Includes the exact in to cm formula, a handy conversion chart, and measurement tips for daily use.
Inches to cm
The Formula: How to Convert Inches to cm
The conversion between the imperial system (inches) and the metric system (centimeters) is standardized internationally. To convert inches to centimeters, you multiply the length in inches by 2.54.
Centimeters (cm) = Inches (in) × 2.54
Example: To convert 5 inches to cm, the math is: $5 \times 2.54 = 12.7$ cm.
Inches to Centimeters Quick Reference Table
This conversion chart shows common lengths for fast reference:
| Inches (in) | Centimeters (cm) |
|---|---|
| 1 in | 2.54 cm |
| 5 in | 12.70 cm |
| 10 in | 25.40 cm |
| 12 in (1 foot) | 30.48 cm |
| 36 in (1 yard) | 91.44 cm |
Why do we use the 2.54 factor?
Since 1959, the International Yard and Pound Agreement standardized the inch as exactly 25.4 millimeters, which is 2.54 centimeters. This ensures that a measurement taken in the United States, United Kingdom, or Canada is identical to one taken in metric countries like Germany or France.
This conversion is essential in many industries, including:
- Digital Displays: Television and monitor screen sizes are almost always sold by their diagonal measure in inches.
- Automotive: Wheel diameters and tire widths often combine imperial and metric measurements.
- Construction: Many tools and hardware components are still produced in inch-based sizes.