Inches to cm: Convert inches to centimeters

Answer
2.54 cm = 1 in

1 in = 2.54 cm. To convert inches to centimeters, multiply by 2.54. To go back, multiply by 0.3937007874 (or divide by 2.54). Inches are used in the US for lumber, screens, tires and hardware.

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Converted length
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How we calculated this

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    Formula

    cm = in × 2.54 in = cm × 0.3937007874 12 in × 2.54 = 30.48 cm

    Inches to cm table

    incm
    0.25 in0.635 cm
    0.5 in1.27 cm
    0.75 in1.905 cm
    1 in2.54 cm
    1.5 in3.81 cm
    2 in5.08 cm
    3 in7.62 cm
    4 in10.16 cm
    5 in12.7 cm
    6 in15.24 cm
    7 in17.78 cm
    8 in20.32 cm
    9 in22.86 cm
    10 in25.4 cm
    12 in30.48 cm
    15 in38.1 cm
    18 in45.72 cm
    20 in50.8 cm
    24 in60.96 cm
    27 in68.58 cm
    32 in81.28 cm
    36 in91.44 cm
    40 in101.6 cm
    48 in121.92 cm
    55 in139.7 cm

    Factors from NIST SP 811 and the BIPM SI Brochure; values rounded to 6 significant digits. Reverse: cm to inches.

    Frequently asked questions

    How many cm is 12 inches?

    12 in = 30.48 cm.

    How many inches is 1 cm?

    1 cm = 0.393701 in.

    Open the full calculator: Length Converter: mm to Inches (with Fractions), Feet and Miles →