Inches to Millimeters
Convert inches to millimeters instantly. Enter a value in in, get mm, and use the formula, examples, and conversion table for quick checks.
How to convert in to mm
To convert a value from inches (in) to millimeters (mm), enter the number in the converter above. Use the swap control if you need the reverse direction.
x is the source value in in; y is the result in mm.
Popular conversions
Quick answers for common in to mm values are available from the related conversion pages.
Use the related tools section for fixed-value conversions and the reverse direction.
Common conversion table
Quick reference table for common in to mm values:
| in | mm |
|---|---|
| 1 | 25.4 |
| 5 | 127 |
| 10 | 254 |
| 50 | 1,270 |
| 100 | 2,540 |
| 1,000 | 25,400 |
About inches
Inch (in) — One international inch is exactly 2.54 centimeters.
Common uses: Inches are common for screen sizes, product dimensions, pipe diameters, and US height notation.
About millimeters
Millimeter (mm) is a length unit.
Frequently Asked Questions
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