Length converter

Inches to Millimeters Converter

1 inch = 25.4 millimeters. Type a number below to convert inches (in) to millimeters (mm) instantly.

Inches (in) Millimeters (mm)

12 in = 304.8 mm

mm = in × 25.4

Free, instant and private — the conversion runs in your browser.

How to convert inches to millimeters

1 inch equals 25.4 millimeters, so you multiply by 25.4:

mm = in × 25.4

Let's convert 12 inches to millimeters:

12 in = 304.8 mm

1 millimeter = 0.0393701 inches. Use our millimeters to inches converter.

An inch is exactly 2.54 centimeters. In the US it is used for screens, TVs, paper sizes and everyday measurements.

A millimeter is one thousandth of a meter. It is used for small, precise measurements like screen sizes, jewelry and rainfall.

FAQ

Quick answers about converting inches to millimeters.

1 inch = 25.4 millimeters. To convert, use: mm = in × 25.4.

Use the formula mm = in × 25.4. For example, 12 in = 304.8 mm. Or type any number into the converter above.

1 millimeter = 0.0393701 inches.

Yes. It is completely free, works on phones and computers, and needs no sign-up. The result updates instantly as you type.

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