Inch. You can also type 5'11", 6 ft 2 in, 1/4 cup or 2 + 3.5.

To
25.4

Millimeter

Formula: × 25.4 (exact, by definition)

Precision and number format
Convert a list

One value per line, or paste a column from a spreadsheet (the first cell of each row is used). Up to 5,000 lines, in to mm.

Converted (Millimeter)

    Convert inches to mm

    This tool converts inches to mm the moment you type — 1 in = 25.4 mm. It's the same trusted math behind the full unit converter, focused on the single inches-to-millimeters conversion so you get the answer without any distractions.

    To convert inches to millimeters, multiply the number of inches by 25.4. Every calculation runs client-side, so your numbers never leave your device, and there's no sign-up, no limit, and nothing to install.

    inches to mm conversion table

    inches to millimeters conversion table
    Inches (in)Millimeters (mm)
    1 in25.4 mm
    2 in50.8 mm
    3 in76.2 mm
    5 in127 mm
    10 in254 mm
    25 in635 mm
    50 in1,270 mm
    100 in2,540 mm

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    inches to mm Converter — frequently asked questions

    How do I convert inches to mm?
    Type a value in the inches field and the millimeters result appears instantly. Everything is calculated in your browser, so there's nothing to submit and no wait.
    How many millimeters are in an inch?
    One inch is 25.4 millimeters. To convert inches to millimeters, multiply the number of inches by 25.4.
    Is my data sent to a server?
    No. The conversion runs entirely in your browser with JavaScript — nothing is uploaded, logged, or stored. It keeps working offline once the page has loaded.
    Is this converter free?
    Yes. No sign-up, no payment details, and no limit on how many conversions you can do.

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