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Inches to Millimeters

Convert in to mm — free online length converter

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1 in = 25.4 mm

Inches to Millimeters Quick Reference

inmm

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How to Convert Inches to Millimeters

This free online converter lets you instantly convert Inches (in) to Millimeters (mm). Simply enter a value and the result updates automatically. Use the swap button to reverse the conversion.

The quick reference table below shows common Inches values and their Millimeters equivalents. All calculations are performed locally in your browser — fast, private, and accurate.

FAQ
How many Millimeters are in one Inches?
One Inches (in) equals 25.4 Millimeters (mm).
How do I convert Inches to Millimeters?
Multiply the Inches value by 25.4. For example, 10 in = 254 mm.
How do I convert Millimeters back to Inches?
Multiply the Millimeters value by 0.039370079, or use the swap button. One mm = 0.039370079 in.
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