Length

km to Nanometers Converter

Convert kilometers (km) to nanometers (nm). 1 kilometer = 1,000,000,000,000 nanometers (exact)

1 kilometer = 1,000,000,000,000 nanometers

How to convert kilometers to nanometers

Formulanm = km × 1,000,000,000,000

Because one nanometer equals 1×10⁻¹² kilometers, you can also divide: nm = km ÷ 1×10⁻¹².

A kilometer is larger than a nanometer: one kilometer contains 1,000,000,000,000 nanometers.

Worked examples

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

Kilometers to nanometers conversion table

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

Kilometers to nanometers: 0.1–10 km
Kilometers (km)Nanometers (nm)
0.1 km100,000,000,000 nm
0.25 km250,000,000,000 nm
0.5 km500,000,000,000 nm
1 km1,000,000,000,000 nm
2 km2,000,000,000,000 nm
3 km3,000,000,000,000 nm
4 km4,000,000,000,000 nm
5 km5,000,000,000,000 nm
6 km6,000,000,000,000 nm
7 km7,000,000,000,000 nm
8 km8,000,000,000,000 nm
9 km9,000,000,000,000 nm
10 km10,000,000,000,000 nm
Kilometers to nanometers: 12–1,000 km
Kilometers (km)Nanometers (nm)
12 km12,000,000,000,000 nm
15 km15,000,000,000,000 nm
20 km20,000,000,000,000 nm
25 km25,000,000,000,000 nm
30 km30,000,000,000,000 nm
40 km40,000,000,000,000 nm
50 km50,000,000,000,000 nm
75 km75,000,000,000,000 nm
100 km100,000,000,000,000 nm
250 km250,000,000,000,000 nm
500 km500,000,000,000,000 nm
1,000 km1×10¹⁵ nm

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).

Nanometer (nm)

One billionth of a metre. Visible light wavelengths run from about 380 to 750 nm, and semiconductor process nodes are named in nanometres. One nanometer equals 1×10⁻⁹ meters (m).

Frequently asked questions

How many nanometers are in one kilometer?

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

How do I convert kilometers to nanometers?

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

How many kilometers are in one nanometer?

One nanometer equals 1×10⁻¹² kilometers. That is the reverse factor, 1 ÷ 1,000,000,000,000.

What is 10 kilometers in nanometers?

10 km = 10,000,000,000,000 nm.

Is this km to nm 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.

Convert kilometers to other units

Convert other units to nanometers

Try “psi to bar”, “cups”, “binary” or “5 ft in cm”.