The inch (US/UK customary) and the centimeter (metric) both have exact definitions, making this a precise length conversion.
How it works
Multiplying inches by 2.54 gives centimeters; dividing centimeters by that same constant gives inches back. Type into either field and the other updates instantly.
What this does not include
This does not include feet-and-inches combined measurements — for height specifically, use this site’s height converter instead.
How to use this calculator
- Enter a value in either inches or centimeters — the other field fills in automatically.
Frequently asked questions
Is this the same conversion as the site’s cm-to-in calculator?
Yes, functionally identical — this version leads with inches first, for anyone specifically searching “inches to cm” rather than “cm to inches.”
Why is 1 inch exactly 2.54 cm?
It’s the exact international definition set by a 1959 agreement standardizing the inch.
Where is this conversion most commonly needed?
Reading product dimensions, screen sizes, and measurements from a different country’s measurement system.
