In the construction and industrial sectors, it is often necessary to convert between inches and millimeters, as measurement standards vary. Inches are used internationally, while millimeters are most common in Sweden and Europe.

With our converter, you can easily enter a value in either inches or millimeters and instantly get the exact equivalent measurement. In addition, inch values are displayed in decimal form for increased precision.

The inch is a unit of length used primarily in the United States, the United Kingdom, and other countries that follow the imperial system of measurement. One inch is exactly 25.4 millimeters in the metric system.

Originally, an inch was roughly the width of an adult man's thumb. In the Middle Ages, the measurement was standardized by measuring the length of three grains from an ear of grain, placed in a row.

Today, inches are used in several areas, including:

• Electronics: To specify screen sizes on TVs, computers and mobile phones.

• Construction and industry: When measuring pipes, tools and machine parts.

• International products: Where measurements are often given in both inches and millimeters.
  

The millimeter (mm) is a unit of length in the metric system, used to measure short distances with high precision. A millimeter is equal to one thousandth of a meter (1 mm = 0.001 meter) and is one of the most widely used units in technology, industry, and science.

The millimeter is part of the metric system, which was developed during the French Revolution in the late 18th century. The system was created to establish a uniform and logical standard of measurement that could be used globally. The basis of the system is the meter, which was originally defined as one ten-millionth of the distance between the equator and the North Pole along a meridian.

Millimeters are a standard unit in most of the world and useful for accurate measurements in both professional and everyday applications. Millimeters are used in, among other things:

• Building and construction: For precise material and detail measurements.

• Industry and technology: To specify dimensions of machine parts, components and tools with high precision.

• Science and medicine: Where accurate measurements are crucial, for example in microscopic studies and medical instrument.

• Crafts and Design: For detailed measurements in small-scale projects.
  

• 1/2 inch to mm = 12.7 mm

• 1/4 inch to mm = 6.35 mm

• 3/4 inch to mm = 19.05 mm

• 3/8 inch to mm = 9.525 mm