Tool
MM to Inches Converter
Convert millimeters to inches for precision measurements.
Unit Converters
What this tool does
Convert metric millimeters to US customary inches.
How to use
- Enter the value in mm.
- View the converted result instantly.
- Use the reverse converter link for the opposite conversion.
Formula
inches = millimeters ÷ 25.4
Examples
25.4 millimeters
Input: 25.4
Output: 1
25.4 ÷ 25.4 = 1 inch.
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 MM to Inches 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