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Inches to Millimeters Converter
Convert inches to millimeters instantly and accurately. 1 in = 25.4 mm. Type any value below β the result updates as you type.
How to use this tool
- 1Enter the value in inches.
- 2Read the converted result in millimeters instantly.
- 3Use the swap button to reverse the conversion, or pick any other unit.
Frequently asked questions
How do you convert inches to millimeters?+
1 in = 25.4 mm. To convert, multiply the number of inches by the conversion factor between in and mm. This calculator does it automatically as you type.
Is this inches to millimeters converter accurate?+
Yes. It uses exact SI/standard conversion factors, so results match official length definitions to full precision.
Is it free and private?+
Completely free with no sign-up. All conversion happens in your browser β nothing is uploaded to a server.
Learn more
- Inches vs Millimeters: what's the difference?
- Inches to Millimeters conversion table
- How many millimeters are in a inch?