How many inches is 30 cm?

30 cm equals 11.81 inches. Multiply any centimeter value by 0.3937 to convert to inches. For the reverse, see [inches to cm]({/length/inches-to-cm/}).

Is 1 cm equal to 0.5 inches?

No. 1 centimeter equals 0.3937 inches. A common approximation is 2.54 cm per inch, or about 1 inch per 2.5 cm.

How do I convert cm to inches without a calculator?

Divide the centimeter value by 2.54. For example, 10 cm ÷ 2.54 = 3.94 inches. For a rough estimate, divide by 2.5.

I'm ordering a desk online and the listing says it's 120 cm wide — will it fit in my 48-inch alcove?

120 cm ÷ 2.54 = 47.24 inches, so the desk is just under 48 inches wide. It would fit, but barely — leave a few centimeters for clearance, and double-check whether the listed width includes handles or trim pieces. For heights, see [cm to feet]({/length/cm-to-feet/}).

CM to Inches Converter

Enter a value to instantly convert between length units.

From

Precision4 dp

1 Centimeter = 0.3937 Inch

Key Formulas

Centimeter → Inch

in = cm × 0.393701

Kilometer → Mile

mi = km × 0.621371

Foot → Meter

m = ft × 0.3048

Inch → Centimeter

cm = in × 2.54

Formula

inches = cm × 0.3937007874

One centimeter equals 0.3937 inches. The centimeter is 1/100th of a meter, the SI base unit of length. The inch is defined as exactly 25.4 millimeters since 1959.

Source: NIST SP 811, 2008 Edition

Frequently Asked Questions

Real-World Examples

Width of a credit card

5 cm = 1.9685 in

Standard school ruler length

30 cm = 11.811 in

Slightly more than one yard

100 cm = 39.3701 in

A person who is 170 cm tall stands about 5 feet 7 inches — useful when filling out a US medical form that asks for height in feet and inches

170 cm = 66.9291 in

km to miles feet to meters inches to cm miles to km meters to feet

CM to Inches Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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