Millimeters to Inches Converter

Millimeters are the standard unit on engineering drawings, hardware and product specs, while US tools and materials are often sized in inches. One inch is exactly 25.4 mm.

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Result:

Feet & inches ↔ centimeters

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    How to Convert Millimeters to Inches

    inches = millimeters ÷ 25.4

    To express the answer as a fraction, multiply the decimal inches by 16 (or 32, 64) and round: 0.3937 in × 16 = 6.3, so 10 mm is just over 6/16 = 3/8 in.

    Worked Examples

    10 mm to inches

    1. 10 ÷ 25.4 = 0.3937

    10 mm = 0.394 in, just over 3/8 in

    A 6 mm drill bit in inches

    1. 6 ÷ 25.4 = 0.2362
    2. The nearest 1/64 fraction is 15/64 in (0.2344 in)

    6 mm = 0.236 in ≈ 15/64 in

    Millimeters to Inches Chart

    Millimeters to Inches conversion table
    Millimeters Inches
    1 mm 0.0394 in
    2 mm 0.0787 in
    3 mm 0.1181 in
    4 mm 0.1575 in
    5 mm 0.1969 in
    6 mm 0.2362 in
    7 mm 0.2756 in
    8 mm 0.315 in
    9 mm 0.3543 in
    10 mm 0.3937 in
    12 mm 0.4724 in
    13 mm 0.5118 in
    15 mm 0.5906 in
    16 mm 0.6299 in
    19 mm 0.748 in
    20 mm 0.7874 in
    22 mm 0.8661 in
    25 mm 0.9843 in
    25.4 mm 1 in
    30 mm 1.1811 in
    35 mm 1.378 in
    40 mm 1.5748 in
    50 mm 1.9685 in
    75 mm 2.9528 in
    100 mm 3.937 in
    150 mm 5.9055 in
    200 mm 7.874 in
    250 mm 9.8425 in
    300 mm 11.811 in

    More Length Conversions

    Going the other way? Use the Inches to Millimeters converter, or the Distance & Length Converter for every length unit, with unit definitions and history.

    Last reviewed:

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