km to Micrometers Converter (km to µm)

How to convert kilometers to micrometers

Formulaµm = km × 1,000,000,000

Multiply the value in kilometers by 1,000,000,000. To go the other way, multiply by 1×10⁻⁹ (or divide by 1,000,000,000).

A kilometer is larger than a micrometer: one kilometer contains 1,000,000,000 micrometers.

Worked examples

1 kilometer1 km × 1,000,000,000 = 1,000,000,000 µm
5 kilometers5 km × 1,000,000,000 = 5,000,000,000 µm
10 kilometers10 km × 1,000,000,000 = 10,000,000,000 µm
20 kilometers20 km × 1,000,000,000 = 20,000,000,000 µm
100 kilometers100 km × 1,000,000,000 = 100,000,000,000 µm

Kilometers to micrometers conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Kilometers to micrometers: 0.1–10 km
Kilometers (km)	Micrometers (µm)
0.1 km	100,000,000 µm
0.25 km	250,000,000 µm
0.5 km	500,000,000 µm
1 km	1,000,000,000 µm
2 km	2,000,000,000 µm
3 km	3,000,000,000 µm
4 km	4,000,000,000 µm
5 km	5,000,000,000 µm
6 km	6,000,000,000 µm
7 km	7,000,000,000 µm
8 km	8,000,000,000 µm
9 km	9,000,000,000 µm
10 km	10,000,000,000 µm

Kilometers to micrometers: 12–1,000 km
Kilometers (km)	Micrometers (µm)
12 km	12,000,000,000 µm
15 km	15,000,000,000 µm
20 km	20,000,000,000 µm
25 km	25,000,000,000 µm
30 km	30,000,000,000 µm
40 km	40,000,000,000 µm
50 km	50,000,000,000 µm
75 km	75,000,000,000 µm
100 km	100,000,000,000 µm
250 km	250,000,000,000 µm
500 km	500,000,000,000 µm
1,000 km	1,000,000,000,000 µm

About the units

Kilometer (km)

One thousand metres. Kilometres measure road distances and running races in most countries; a 10K race is 10 km, about 6.2 miles. One kilometer equals 1,000 meters (m).

Micrometer (µm)

One millionth of a metre, often called a micron. Human hair is roughly 50–100 µm across, and filter and particle sizes are given in micrometres. One micrometer equals 0.000001 meters (m).

Frequently asked questions

How many micrometers are in one kilometer?

There are 1,000,000,000 micrometers in one kilometer, and this value is exact by definition.

How do I convert kilometers to micrometers?

Multiply the number of kilometers by 1,000,000,000. For example, 10 km × 1,000,000,000 = 10,000,000,000 µm.

How many kilometers are in one micrometer?

One micrometer equals 1×10⁻⁹ kilometers. That is the reverse factor, 1 ÷ 1,000,000,000.

What is 10 kilometers in micrometers?

10 km = 10,000,000,000 µm.

Is this km to µm converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

km to Micrometers Converter