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cm to Inches

cm to Inches Converter

Convert centimetres to inches and back instantly. One inch is 2.54 cm exactly, so every conversion is precise — type any value and read off the result.

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cm ↔ inches

1 inch = 2.54 cm (exact).

Converted length
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    1 inch = 2.54 cm exactly (international standard since 1959). Conversions are precise.

    Centimetres and inches

    The centimetre is part of the metric system; the inch is imperial. Since 1959 the inch has been defined as exactly 2.54 centimetres, so converting between them is precise — there's no rounding error in the factor itself. To go from cm to inches you divide by 2.54; from inches to cm you multiply by 2.54.

    💡 Quick answer

    30 cm = 11.81 inches (30 ÷ 2.54). Going the other way, 12 inches = 30.48 cm — which is exactly one foot. For a rough mental check, divide cm by 2.5 to get a close inch figure.

    cm to inches reference table

    CentimetresInches
    1 cm0.39 in
    5 cm1.97 in
    10 cm3.94 in
    20 cm7.87 in
    30 cm11.81 in
    100 cm39.37 in

    Based on the exact factor 1 inch = 2.54 cm. Useful for screen sizes, paper, fabric and DIY measurements.

    When you'll need this

    Screen and TV sizes, paper formats, fabric, shelving and imported furniture often mix the two systems. For converting a person's height specifically, the height converter splits the result into feet and inches; for everything else — weight, temperature, volume — see the unit converter.

    MB
    Reviewed by Mustafa Bilgic
    Founder, Calcu · Consumer-finance tools

    "This is the conversion people reach for most — screens, paper, DIY. Because the inch is defined as exactly 2.54 cm, we keep full precision and just round the display, so a 100 cm measurement reads a clean 39.37 inches."

    Frequently asked questions

    How do I convert cm to inches?

    Divide the number of centimetres by 2.54. For example, 30 cm ÷ 2.54 = 11.81 inches. To go the other way, multiply inches by 2.54.

    How many inches is 30 cm?

    30 cm is 11.81 inches. That's 30 divided by the exact factor of 2.54 cm per inch.

    How many cm is 1 inch?

    One inch is exactly 2.54 centimetres. This has been the international definition since 1959, so the conversion is precise rather than approximate.

    How do I convert inches to cm?

    Multiply the number of inches by 2.54. For example, 12 inches × 2.54 = 30.48 cm, which is exactly one foot.

    Is there a quick way to estimate cm to inches?

    Yes — divide centimetres by about 2.5 for a close mental estimate. For an exact figure, divide by 2.54, which this converter does automatically.