# Micrometers to Millimeters Converter

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Convert Millimeters to Micrometers (mm to µm) ▶

## Conversion Table

 micrometers to millimeters µm mm 100 µm 0.1 mm 200 µm 0.2 mm 300 µm 0.3 mm 400 µm 0.4 mm 500 µm 0.5 mm 600 µm 0.6 mm 700 µm 0.7 mm 800 µm 0.8 mm 900 µm 0.9 mm 1000 µm 1 mm 1100 µm 1.1 mm 1200 µm 1.2 mm 1300 µm 1.3 mm 1400 µm 1.4 mm 1500 µm 1.5 mm 1600 µm 1.6 mm 1700 µm 1.7 mm 1800 µm 1.8 mm 1900 µm 1.9 mm 2000 µm 2 mm

## How to convert

1 micrometer (µm) = 0.001 millimeter (mm). Micrometer (µm) is a unit of Length used in Metric system. Millimeter (mm) is a unit of Length used in Metric system.

## Definition of the micrometer

The micrometer, also known as the micron, is a unit of length in the International System of Units (SI) that equals one millionth of a meter. Its symbol is µm.

## History of the micrometer

The term micron and the symbol µ were officially accepted for use in isolation to denote the micrometer in 1879, but officially revoked by the International System of Units (SI) in 1967. This became necessary because the older usage was incompatible with the official adoption of the unit prefix micro-, denoted µ, during the creation of the SI in 1960. In the SI, the systematic name micrometre became the official name of the unit, and µm became the official unit symbol.

## How to convert micrometer

The micrometer can be converted to other units of length using simple multiplication or division by powers of 10. For example, one micrometer is equal to 0.001 millimeters, 0.000001 meters, or 0.000000001 kilometers in the SI system. One micrometer is also equal to 0.000039 inches, 0.0000033 feet, or 0.00000062 miles in the US standard system.

## Where micrometer is used

The micrometer is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibers. The width of a single human hair ranges from approximately 20 to 200 µm

The micrometer is used in different countries and applications for various purposes. For example:

• In Canada, the micrometer is used to measure air quality by monitoring the concentration of particulate matter (PM) in the atmosphere. PM2.5 refers to particles that are less than 2.5 micrometers in diameter, which can penetrate deep into the lungs and cause health problems.
• In Japan, the micrometer is used to measure the thickness of paper and film products. The standard paper size A4 has a thickness of about 100 µm, while a typical plastic wrap has a thickness of about 10 µm.

## Example conversions of micrometer to other units

Here are some sample conversions of micrometer to other units:

• 1 µm = 0.001 mm
• 1 µm = 0.000001 m
• 1 µm = 0.000000001 km
• 1 µm = 0.000039 in
• 1 µm = 0.0000033 ft
• 1 µm = 0.00000062 mi
• 1 µm = 10^-6 m

## Definition of the millimeter

A millimeter is a unit of length in the metric system, which is based on the International System of Units (SI). It is defined as one thousandth of a meter, which is the SI base unit of length. One millimeter can be written as 1 mm or 0.001 m.

## How to convert millimeter to other units of length

To convert millimeter to other units of length, we need to use conversion factors that relate the millimeter to the desired unit. For example, to convert millimeter to centimeter, we need to know that 1 cm = 10 mm, so we can divide the number of millimeters by 10 to get the number of centimeters. Similarly, to convert millimeter to inch, we need to know that 1 in = 25.4 mm, so we can divide the number of millimeters by 25.4 to get the number of inches.

Here are some common conversion factors for millimeter and other units of length in the US standard system and the SI system:

• 1 mm = 0.1 cm
• 1 mm = 0.03937 in
• 1 mm = 0.001 m
• 1 mm = 0.000001 km
• 1 mm = 0.00000062137 mi
• 1 mm = 0.00000053996 nmi

## Where millimeter is used

The millimeter is a widely used unit of length in many fields and applications around the world. Some examples are:

• In engineering and manufacturing, the millimeter is often used to measure small dimensions and tolerances of parts and products.
• In medicine and biology, the millimeter is often used to measure the size and growth of cells, tissues, organs, and microorganisms.
• In astronomy and physics, the millimeter is often used to measure the wavelength and frequency of electromagnetic radiation, such as radio waves and microwaves.
• In geography and cartography, the millimeter is often used to measure the scale and distance on maps and globes.
• In art and design, the millimeter is often used to measure the thickness and width of lines, shapes, and fonts.

## History of millimeter

The millimeter has a long and varied history in different countries and cultures. Some historical facts are:

• The first recorded use of the millimeter as a unit of length was in France in the late 18th century, during the French Revolution. The French Academy of Sciences adopted the metric system as a standard for measurement and defined the meter as one ten-millionth of the distance from the equator to the pole.
• The millimeter was officially recognized as a part of the SI system in 1960, when the General Conference on Weights and Measures (CGPM) adopted a new definition of the meter based on the wavelength of light emitted by a krypton-86 atom.
• The millimeter is still widely used today in many countries that have adopted the metric system, such as most of Europe, Asia, Africa, and Latin America. However, some countries still use other units of length alongside or instead of the millimeter, such as the United States, Canada, and the United Kingdom.

## Example conversions of millimeter to other units

Here are some examples of how to convert millimeter to other units of length using the conversion factors given above:

• To convert 5 mm to cm, we divide by 10: 5 mm / 10 = 0.5 cm
• To convert 12 mm to in, we divide by 25.4: 12 mm / 25.4 = 0.47244 in
• To convert 100 mm to m, we divide by 1000: 100 mm / 1000 = 0.1 m
• To convert 250 mm to km, we divide by 1000000: 250 mm / 1000000 = 0.00025 km
• To convert 500 mm to mi, we divide by 1609344: 500 mm / 1609344 = 0.00031069 mi
• To convert 1000 mm to nmi, we divide by 1852000: 1000 mm / 1852000 = 0.00053996 nmi
Millimeters also can be marked as millimetres.

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