Inch to Millimeter
Convert in to mm instantly — free, no sign-up.
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About the Inch (in)
The Inch is defined as exactly 2.54 centimeters, still the standard for screen sizes, tools, and paper sizes in the US.
About the Millimeter (mm)
The Millimeter is one thousandth of a meter, commonly used for precision measurements like paper thickness or small mechanical parts.
How to convert in to mm
- Enter the value in in in the box above.
- The mm equivalent updates instantly.
- Use the swap button to convert mm back to in just as easily.