Tool
Inches to MM Converter
Convert inches to millimeters for metric precision.
Unit Converters
Try1 inch
What this tool does
Convert US customary inches to metric millimeters.
How to use
- Enter the value in inches.
- View the converted result instantly.
- Use the reverse converter link for the opposite conversion.
Formula
millimeters = inches × 25.4
Examples
1 inch
Input: 1
Output: 25.4
1 × 25.4 = 25.4 millimeters.
Common use cases
- Convert measurements for projects and listings
- Switch between metric and US customary units
- Quick reference for everyday unit math
FAQ
Can I convert back to the original unit?
Yes. Use the reverse Inches to MM Converter.
Does this support decimal values?
Yes. Decimal inputs are supported.
Is this conversion exact?
This tool uses standard published conversion factors.
Source notes
- NIST: 1 inch = 25.4 mm exactly.
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Last reviewed: 2026-05-23