# Micrometers (µm) to Millimeters (mm) Converter

This length unit converter dynamically calculates a value you enter in micrometers (µm) and converts it to its equivalent value in millimeters (mm). A micrometer is also known as a micron.

## How many micrometers (µm) are in a millimeter (mm)? What is the formula for how to convert micrometers to millimeters (µm to mm)?

1 micrometer (µm) = 0.001 millimeter (mm)
So we can say that there is 0.001 millimeter in 1 micrometer.
This means that the multiplication conversion factor to convert a quantity expressed in a micrometer unit of measurement to an equivalent quantity expressed in a millimeter unit of measurement is 0.001.

Inversely (or reciprocally),

1 millimeter (mm) = 1,000 micrometers (µm)
So we can say that there is 1,000 micrometers in 1 millimeter.
This means that the division conversion factor to convert a quantity expressed in a micrometer unit of measurement to an equivalent quantity expressed in a millimeter unit of measurement is 1,000.

Knowing this inverse mathematical relationship between the two conversion factors and their reciprocal operations, we can derive two formulas to calculate and convert a quantity of length expressed in micrometers to an equivalent quantity of length expressed in millimeters (µm to mm). Both formulas will yield the same result. The formulas are:

`mm = µm × 0.001    → This is the formula based on the multiplication conversion factor.`

and

`mm = µm ÷ 1,000    → This is the formula based on the division conversion factor.`

For example, if you have a length of 17,500 micrometers that you want to convert to millimeters, you would use either of the two formulas as follows:

`mm = 17,500 µm × 0.001 = 17.5 mm`
`mm = 17,500 µm ÷ 1,000 = 17.5 mm`

So, the result is the same using either formula, which is 17.5 millimeters.

## Micrometers to millimeters (µm to mm) conversion chart

To save you time and effort spent on having to perform manual calculations or look up conversion formulas every time a conversion from micrometers to millimeters is needed, here is a micrometers-to-millimeters conversion chart for your quick and easy reference. This conversion chart (or conversion table) shows common measurement values of length in micrometers and their equivalent measurement values in millimeters. These equivalent measurement values may be rounded off to 1 or 2 decimal places when it is mathematically expedient for everyday applications.

## Conversion of 1 micrometer (µm) to other units of length

Here is a reference list providing a conversion of 1 micrometer (µm) to its equivalent values in various units of length, both metric and imperial:

• 1 micrometer (µm) = 1,000 nanometers (nm)
• 1 micrometer (µm) = 0.001 millimeter (mm)
• 1 micrometer (µm) = 0.0001 centimeter (cm)
• 1 micrometer (µm) = 0.00001 decimeter (dm)
• 1 micrometer (µm) = 0.000001 meter (m)
• 1 micrometer (µm) = 0.000000001 kilometer (km)
• 1 micrometer (µm) = 0.000039370078740157 inch (in)
• 1 micrometer (µm) = 0.0000032808398950131 foot (ft)
• 1 micrometer (µm) = 0.0000010936132983377 yard (yd)
• 1 micrometer (µm) = 0.00000000062137119223733 mile (mi)
• 1 micrometer (µm) = 0.00000000053995680345572 nautical mile (nmi)

## What is a micrometer (µm)?

Definition of micrometer: A micrometer, also known as a micron, is a unit of length in the International System of Units (SI). It is equal to one millionth of a meter (10^-6 m). It is frequently used in scientific and industrial applications to measure very small distances such as cells, bacteria, and fine particles.

The term “micrometer” (µm) is the technically correct and preferred term according to the International System of Units (SI). But the term “micron” is more commonly used in everyday usage.

The abbreviation for micrometer is μm. The single Unicode character ㎛ (U+339B) represents the 2-character Greek/Latin abbreviation for micrometer. The Windows Alt code for this character ㎛ is Alt + 13211.

## What is a millimeter (mm)?

Definition of millimeter: A millimeter is a unit of length in the International System of Units (SI). It is equivalent to one thousandth of a meter (10^-3 m). It is commonly used for precisely measuring small lengths and dimensions such as mechanical parts in engineering and manufacturing.

The abbreviation for millimeter is mm. The single Unicode character ㎜ (U+339C) represents the 2-character Latin abbreviation for millimeter. The Windows Alt code for this character ㎜ is Alt + 13212.