# Micrometers to Kilometers Converter

Enter the length in micrometers below to get the value converted to kilometers.

Results in Kilometers: 1 µm = 1.0E-9 km
Hint: use a scientific notation calculator to convert E notation to decimal

Do you want to convert kilometers to micrometers?

## How to Convert Micrometers to Kilometers

To convert a measurement in micrometers to a measurement in kilometers, divide the length by the following conversion ratio: 1,000,000,000 micrometers/kilometer.

Since one kilometer is equal to 1,000,000,000 micrometers, you can use this simple formula to convert:

kilometers = micrometers ÷ 1,000,000,000

The length in kilometers is equal to the length in micrometers divided by 1,000,000,000.

For example, here's how to convert 5,000,000,000 micrometers to kilometers using the formula above.
kilometers = (5,000,000,000 µm ÷ 1,000,000,000) = 5 km

## What is a Micrometer?

One micrometer is equal to one-millionth (1/1,000,000) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.

The micrometer, or micrometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "micro" is the prefix for millionths, or 10-6. A micrometer is sometimes also referred to as a micron. Micrometers can be abbreviated as µm; for example, 1 micrometer can be written as 1 µm.

To get an idea of the actual physical length of a micrometer, one human hair is 40-50 µm thick, demonstrating how small this unit of measure is.

## What is a Kilometer?

One kilometer is equal to 1,000 meters, which are defined as the distance light travels in a vacuum in 1/299,792,458 of a second. One kilometer is equal to 0.621371 miles.

The kilometer, or kilometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "kilo" is the prefix for thousands, or 103. Kilometers can be abbreviated as km; for example, 1 kilometer can be written as 1 km.

## Micrometer to Kilometer Conversion Table

Table showing various micrometer measurements converted to kilometers.
Micrometers Kilometers
1 µm 0.000000001 km
2 µm 0.000000002 km
3 µm 0.000000003 km
4 µm 0.000000004 km
5 µm 0.000000005 km
6 µm 0.000000006 km
7 µm 0.000000007 km
8 µm 0.000000008 km
9 µm 0.000000009 km
10 µm 0.00000001 km
100 µm 0.0000001 km
1,000 µm 0.000001 km
10,000 µm 0.00001 km
100,000 µm 0.0001 km
1,000,000 µm 0.001 km
10,000,000 µm 0.01 km
100,000,000 µm 0.1 km
1,000,000,000 µm 1 km

## References

1. Ambler Thompson and Barry N. Taylor, Guide for the Use of the International System of Units (SI), National Institute of Standards and Technology, https://physics.nist.gov/cuu/pdf/sp811.pdf