inch to mm Length Converter

Convert inch to mm with an exact formula and reverse conversion.

Need help with the calculation?
25.4 mm
mm = inch x 25.4; inch = mm / 25.4
Need another length unit? Use the full length converter.
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inch to mm Length Converter formula

Convert inch to mm. Type a value in either field and the reverse field updates immediately.

mm = inch x 25.4. Reverse formula: inch = mm / 25.4.

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