How many cm in 1 inch?
The answer is 2.54.

We assume you are converting between **centimetre** and **inch**.

You can view more details on each measurement unit:

cm or
inch

The SI base unit for **length** is the metre.

1 metre is equal to 100 cm, or 39.370078740157 inch.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between centimetres and inches.

Type in your own numbers in the form to convert the units!

1 cm to inch = 0.3937 inch

5 cm to inch = 1.9685 inch

10 cm to inch = 3.93701 inch

20 cm to inch = 7.87402 inch

30 cm to inch = 11.81102 inch

40 cm to inch = 15.74803 inch

50 cm to inch = 19.68504 inch

75 cm to inch = 29.52756 inch

100 cm to inch = 39.37008 inch

You can do the reverse unit conversion from inch to cm, or enter any two units below:

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A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundreth of a metre, the current SI base unit of length. A centimetre is part of a metric system. It is the base unit in the centimetre-gram-second system of units. A corresponding unit of area is the square centimetre. A corresponding unit of volume is the cubic centimetre.

The centimetre is a now a non-standard factor, in that factors of 10^{3} are often preferred. However, it is practical unit of length for many everyday measurements. A centimetre is approximately the width of the fingernail of an adult person.

An inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and 12 inches in a foot. The inch is usually the universal unit of measurement in the United States, and is widely used in the United Kingdom, and Canada, despite the introduction of metric to the latter two in the 1960s and 1970s, respectively. The inch is still commonly used informally, although somewhat less, in other Commonwealth nations such as Australia; an example being the long standing tradition of measuring the height of newborn children in inches rather than centimetres. The international inch is defined to be equal to 25.4 millimeters.

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