Inches to Centimeters
( in → cm )
Instantly convert inches to centimeters. Enter any value below and get an accurate result with the full formula and reference table.
How to Convert Inches to Centimeters
To convert inches to centimeters, multiply the number of inches by 2.54. This factor comes from the international agreement that 1 inch is exactly 2.54 centimeters.
Step-by-Step Example
Let’s convert 5 inches to centimeters:
1. Multiply by 2.54: 5 × 2.54 = 12.7 cm
2. So 5 inches equals 12.7 centimeters.
For a height of 5 feet 9 inches: first convert feet to inches (5×12=60), add 9 = 69 inches, then 69 × 2.54 = 175.26 cm.
Why Exactly 2.54?
In 1959, the International Yard and Pound Agreement standardized the inch as exactly 2.54 cm across the US, UK, Canada, Australia, New Zealand, and South Africa. Before that, slight regional differences caused small inconsistencies in science and trade. This exact definition makes conversions precise and reliable.
When You’d Use Each Unit
Inches are commonly used in the US and UK for screen sizes, clothing, and construction. Centimeters are the standard in most of the world for everyday measurements and science. Converting between them is essential for international shopping, understanding product dimensions, and traveling.
Common inches values converted to centimeters — typical lengths highlighted.
| Inches (in) | Centimeters (cm) | Approximate |
|---|