# Convert microns to millimeters

Enter the number of microns you want to convert to millimeters in the text box below. The conversion to length in millimeters will update as you type.

microns (µ)
1 microns = 0.001 millimeters

## Precise decimal and fraction answers

The conversion in millimeters rounded to six significant decimal places is 1 µ = 0.00100000 mm. The precise fraction answer is 1/1000 mm.

### Decimal Precision

Conversion from one to ten decimal places

• 1 µ = 0.001 mm
• 1 µ = 0.0010 mm
• 1 µ = 0.00100 mm
• 1 µ = 0.001000 mm
• 1 µ = 0.0010000 mm
• 1 µ = 0.00100000 mm
• 1 µ = 0.001000000 mm
• 1 µ = 0.0010000000 mm
• 1 µ = 0.00100000000 mm
• 1 µ = 0.001000000000 mm

## How many millimeters are in a micron?

There are 0.001 millimeters in one micron. A micron is 0.10% of a millimeter. A millimeter is 99,900% longer than one micron.

## Microns to millimeters conversion factor and formulas

Formula

The conversion factor between microns and millimeters is 1,000. This represents the ratio of microns per one millimeter. To calculate the value in millimeters, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from microns to millimeters, divide microns by 1,000.
The formula is expressed as:
µ ÷ 1,000 = mm

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 1,000 is 1/1,000 or 0.001. To convert from microns to millimeters, multiply microns by 0.001.
The formula is expressed as:
µ × 0.001 = mm

A conversion from microns to millimeters are units within in the metric (SI) or SI compatible systems.

SI Unit

The micrometer is a very small unit of length within the SI (metric) system. It is officially defined as one millionth (1/1,000,000) of a meter or one thousandth (1/1,000) of a millimeter. The micrometer is also commonly referred to as a micron. It is commonly used when measuring microscopic sizes like bacteria or biological cells. Internationally it is spelled 'micrometre' whereas the U.S. spells it 'micrometer'. The symbol for a micrometer is µ.

SI Unit

Within the SI (metric) system of measurement, the millimeter is officially defined as one thousandth (1/1,000) of a meter. It is commonly used when measuring very short lengths. Internationally it is spelled 'millimetre' whereas the U.S. spells it 'millimeter'. The symbol for millimeters is mm.

## Reverse this conversion

Convert from millimeters to microns instead.

## 1 microns to other length units

### Metric

• 1 µ = 1×10-9 km
• 1 µ = 1×10-6 m
• 1 µ = 1×10-5 dm
• 1 µ = 1×10-4 cm
• 1 µ = 0.001 mm
• 1 µ = 1 µ
• 1 µ = 1,000 nm

### Imperial/U.S.

• 1 µ = 6.214×10-10 mi
• 1 µ = 1.094×10-6 yd
• 1 µ = 3.281×10-6 ft
• 1 µ = 3.937×10-5 in

## References and Citations

1. International Bureau of Weights and Measures (BIPM) The International System of Units (SI)

µ mm
1 µ 0.001 mm
2 µ 0.002 mm
3 µ 0.003 mm
4 µ 0.004 mm
5 µ 0.005 mm
6 µ 0.006 mm
7 µ 0.007 mm
8 µ 0.008 mm
9 µ 0.009 mm
10 µ 0.01 mm
µ mm
20 µ 0.02 mm
30 µ 0.03 mm
40 µ 0.04 mm
50 µ 0.05 mm
60 µ 0.06 mm
70 µ 0.07 mm
80 µ 0.08 mm
90 µ 0.09 mm
100 µ 0.1 mm
1,000 µ 1 mm