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# How Many Millimeters in an Inch

Many people have problems with converting units from one measurement system to units from another one. But if you live in the USA, you may need to do in pretty often. The point is that most of the world uses the metric system, but in the United States it has not been adopted. It causes a great deal of confusion, and not everyone is able to give the right answer to the question, “How many millimeters1 are there in an inch2?”

In 1959, the British Commonwealth and the USA gave the definition to the international yard, which is equal to 0.9144 meters. One yard has 36 inches, so the length of the international inch is 25.4 millimeters. If you convert inches to millimeters, you have to multiply the number of inches by 25.4. For converting to inches, divide the millimeters by 25.4. Use a calculator, if necessary.

This table helps you to convert millimeters and inches into other units of length.

Millimeters
Inches
One centimeter
10
0.3937
One inch
25.4
1
One foot
304.8
12
One yard
914.4
36
One meter
1000
39.37

Inches and Millimeters

Here are some facts about millimeters and inches that may be useful to you.

The inch is mostly used in the USA, where it is one of the official units of length. Canada, Australia, the United Kingdom and some other countries have accepted the metric system, but their citizens still measure length in inches informally. It is well-known that inches are widely used for measuring diagonals of 2-dimentional displays.

Millimeters are the smallest units of length that are in everyday use. The millimeter is one thousandth of the meter, which is one of the basic SI3 units. It consists of 1000 micrometers (1 000 000 nanometers).

The following video will show you how to measure length with a regular metric ruler:

1. The millimeter (British English: millimetre; abbr. mm) is a metric length unit, which is equal to 1/10 centimeter and 1000 micrometers. One international inch has 25.4 millimeters.
2. The inch (abbr. in, symbol ”) is a non-metric length unit in various systems. There are 25.4 millimeters in one international inch.
3. The International System of Units (abbr. ISU, SI) is a modern system of measurement units, which is most widely used in the world. In consists of seven basic units: meters, kilograms, ampere, second, kelvin, mole, and candela).
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