How many centimeters are in an inch?
There are exactly 2.54 centimeters in 1 inch.
Detailed answer
Since 1959, the international inch has been defined as exactly 2.54 centimeters. To convert inches to centimeters, multiply by 2.54. To convert centimeters to inches, divide by 2.54. This definition links imperial inches cleanly to the metric system.
Relationship context
The inch is US customary / imperial; the centimeter is metric (SI). Converting between them is common for screen sizes, tools, and body measurements when people need to switch between US and metric contexts.
Quick conversion table
| Inch (in) | Centimeter (cm) |
|---|---|
| 0.1 | 0.254 |
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 4 | 10.16 |
| 5 | 12.7 |
| 6 | 15.24 |
| 7 | 17.78 |
| 8 | 20.32 |
| 9 | 22.86 |
| Inch (in) | Centimeter (cm) |
|---|---|
| 10 | 25.4 |
| 20 | 50.8 |
| 30 | 76.2 |
| 40 | 101.6 |
| 50 | 127 |
| 60 | 152.4 |
| 70 | 177.8 |
| 80 | 203.2 |
| 90 | 228.6 |
| 100 | 254 |
More Inches converters
Dedicated pages from Inch to every other common length unit (meter, kilometer, centimeter, millimeter, inch, feet, mile, yard).