Inch vs CM - Difference, Formula, and Examples
Compare inches and centimeters, including their size, systems of measurement, and common uses.
How large is each unit?
An inch is longer than a centimeter: one inch equals exactly 2.54 cm, while one centimeter equals about 0.3937 inches.
Where they are used
Inches belong to the US customary and imperial measurement traditions. Centimeters are part of the metric system and are used broadly around the world.
Which unit should you use?
Use the unit expected by your audience, product specification, or standard. When comparing international dimensions, show both units to reduce ambiguity.
Related measurement tools
Convert a value with the inches-to-cm converter, use the reverse centimeter converter, or compare common values in the inch-to-cm chart. Popular examples include 10 inches in cm and 12 inches in cm.
Browse the complete inch-to-cm chart →
Frequently asked questions
What is the exact inch-to-cm conversion factor?
One inch is exactly 2.54 centimeters.
Can I use the converter for decimal measurements?
Yes. The converter accepts whole and decimal measurements and displays up to four decimal places.