1 inch to centimeters
1 inch = 2.54 centimeters
Formula: centimeters = inches x 2.54
One inch is the base unit on every American tape measure, and its centimeter value is needed whenever a US dimension has to match metric hardware, screens, or print sizes.
How to Convert inches to centimeters
The inch-to-centimeter conversion is exact by international agreement. One inch is defined as precisely 25.4 millimeters, or 2.54 centimeters, a definition adopted worldwide in 1959 to unify imperial and metric length.
The formula is centimeters = inches x 2.54. Multiply your value by the factor: 1 x 2.54 = 2.54 centimeters.
The reverse is just as direct: 2.54 centimeters equals 1 inch. That symmetry is a quick way to sanity-check any conversion you make.
inches to centimeters Conversion Table
Use this table to read off nearby values at a glance. The highlighted row is the 1-inches conversion from this page.
| inches | centimeters |
|---|---|
| 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 |
| 10 | 25.4 |
Reverse: centimeters to inches
Need to go the other way? 2.54 centimeters converts back to 1 inch. For the full breakdown in that direction, see 1 centimeter to inches.
Frequently Asked Questions
What is 1 inch in centimeters?
1 inch measures 2.54 centimeters. It is exact because the inch is defined as precisely 25.4 millimeters, a definition that fixes every centimeter, inch, and foot conversion.
Does converting inches to centimeters lose any accuracy?
As precise as it gets. The inch equals exactly 2.54 centimeters under the 1959 standard, so the underlying factor is perfect; the only approximation is how many decimal places we choose to show.
How do I get from 2.54 centimeters back to inches?
Reverse the steps and you return to 1 inch, exactly where you started. For other lengths, the inch converter linked below handles any value.
Convert Any Value
Need a different number or unit? Open the Inch Converter to convert length between any units instantly.
Open the Inch ConverterBrowse all unit conversions or open the Inch Converter.
Disclaimer: This calculator is for informational and educational purposes only. Results are estimates and may not reflect exact values.
Last updated: June 13, 2026