What Is 1 Inch
Quick reference and simple comparisons for everyday use.
Exact conversions
| Unit | Value |
|---|---|
| Centimeters | 2.54 cm |
| Millimeters | 25.4 mm |
| Feet | 0.083333 ft |
Need a calculator. Go to the inch to cm converter or the inch to mm converter.
Everyday examples
- A standard adult thumb width is close to 1 inch
- A US quarter coin is about 1 inch in diameter
- Two and a half centimeters on a school ruler equals 1 inch
FAQ
Is 1 inch always 2.54 cm
Yes. The international inch is defined as exactly 2.54 centimeters.
How do I convert quickly
Multiply inches by 2.54. Divide centimeters by 2.54 to get inches.