Online Tools HarborInch to millimeter formula
mm = in × 25.4 · 1 inch = 25.4 millimeters
in to mm conversion table
| inches (in) | millimeters (mm) |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 6 in | 152.4 mm |
| 12 in | 304.8 mm |
Need the opposite? Use the millimeters to inches converter.
How to use the Inches to Millimeters converter
- Enter the value you want to convert.
- Pick the units to convert from and to (or click ⇄ to swap).
- Read the result instantly, with the formula and a full table below.
About this tool
Convert inches to millimeters instantly, with the formula and a in to mm conversion table. It is part of the free Converters collection on Online Tools Harbor. Everything happens locally in your browser, so it is fast and private.
Frequently asked questions
How do I convert inches to millimeters?
Use the formula mm = in × 25.4. For example, 0.5 in = 12.7 mm.
How many millimeters are in 1 inch?
1 inch = 25.4 millimeters. To convert, multiply the value in inches by 25.4.
Is the Inches to Millimeters free?
Yes. The Inches to Millimeters is completely free to use, with no sign-up and no limits on normal use.
Is my data safe?
Yes. This tool runs entirely in your web browser using JavaScript. Your text is never uploaded to our servers.
Does it work on mobile?
Yes, it works in any modern browser on phones, tablets and computers. No app to install.
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