How many millimeters are in one inch?
One inch equals exactly 25.4 millimeters.
Converters
Inch to MM Converter
Convert inches to millimeters and millimeters to inches instantly with formulas, examples, and FAQs.
Tool
Inch to MM Converter
Convert inches to millimeters and millimeters to inches instantly with formulas, examples, and FAQs.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online inch to mm converter to quickly convert between inches (in) and millimeters (mm).
Conversion Formula
in → mm
mm = in × 25.4
mm → in
in = mm ÷ 25.4
Examples
- 1 in = 25.4 mm
- 5 in = 127 mm
- 100 mm = 3.937 in
Frequently Asked Questions
How do you convert inches to millimeters?
Multiply the inch value by 25.4.
How do you convert millimeters to inches?
Divide the millimeter value by 25.4.
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