Micrometers to km Converter (µm to km)

How to convert micrometers to kilometers

Formulakm = µm × 1×10⁻⁹

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

A micrometer is smaller than a kilometer: it takes 1,000,000,000 micrometers to make one kilometer.

Worked examples

1 micrometer1 µm × 1×10⁻⁹ = 1×10⁻⁹ km
5 micrometers5 µm × 1×10⁻⁹ = 5×10⁻⁹ km
10 micrometers10 µm × 1×10⁻⁹ = 1×10⁻⁸ km
20 micrometers20 µm × 1×10⁻⁹ = 2×10⁻⁸ km
100 micrometers100 µm × 1×10⁻⁹ = 1×10⁻⁷ km

Micrometers to kilometers conversion table

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

Micrometers to kilometers: 0.1–10 µm
Micrometers (µm)	Kilometers (km)
0.1 µm	1×10⁻¹⁰ km
0.25 µm	2.5×10⁻¹⁰ km
0.5 µm	5×10⁻¹⁰ km
1 µm	1×10⁻⁹ km
2 µm	2×10⁻⁹ km
3 µm	3×10⁻⁹ km
4 µm	4×10⁻⁹ km
5 µm	5×10⁻⁹ km
6 µm	6×10⁻⁹ km
7 µm	7×10⁻⁹ km
8 µm	8×10⁻⁹ km
9 µm	9×10⁻⁹ km
10 µm	1×10⁻⁸ km

Micrometers to kilometers: 12–1,000 µm
Micrometers (µm)	Kilometers (km)
12 µm	1.2×10⁻⁸ km
15 µm	1.5×10⁻⁸ km
20 µm	2×10⁻⁸ km
25 µm	2.5×10⁻⁸ km
30 µm	3×10⁻⁸ km
40 µm	4×10⁻⁸ km
50 µm	5×10⁻⁸ km
75 µm	7.5×10⁻⁸ km
100 µm	1×10⁻⁷ km
250 µm	2.5×10⁻⁷ km
500 µm	5×10⁻⁷ km
1,000 µm	0.000001 km

About the units

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).

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).

Frequently asked questions

How many kilometers are in one micrometer?

There are 1×10⁻⁹ kilometers in one micrometer, and this value is exact by definition.

How do I convert micrometers to kilometers?

Multiply the number of micrometers by 1×10⁻⁹. For example, 10 µm × 1×10⁻⁹ = 1×10⁻⁸ km.

How many micrometers are in one kilometer?

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

What is 10 micrometers in kilometers?

10 µm = 1×10⁻⁸ km.

Is this µm to km 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.

Micrometers to km Converter