1 Inch to Millimeters

1 inch equals exactly 25.4 millimeters.

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How to use this tool

Enter inches in the fields above.
Results update instantly as you type — or click Calculate.
Read your millimeters and the full breakdown beneath it.

Convert 1 inch to millimeters using the exact 25.4 mm per inch definition.

Frequently asked questions

How do I convert inches to millimeters?: Multiply the number of inches by 25.4 to get millimeters.