Kilometers to Nanometers Converter

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


Result in Nanometers:

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1 km = 1,000,000,000,000 nm

Do you want to convert nanometers to kilometers?

How to Convert Kilometers to Nanometers

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

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

nanometers = kilometers × 1,000,000,000,000

The length in nanometers is equal to the length in kilometers multiplied by 1,000,000,000,000.

For example, here's how to convert 5 kilometers to nanometers using the formula above.
nanometers = (5 km × 1,000,000,000,000) = 5,000,000,000,000 nm

How Many Nanometers Are in a Kilometer?

There are 1,000,000,000,000 nanometers in a kilometer, which is why we use this value in the formula above.

1 km = 1,000,000,000,000 nm

Kilometers and nanometers are both units used to measure length. Keep reading to learn more about each unit of measure.

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.[1] 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.

Learn more about kilometers.

What Is a Nanometer?

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

The nanometer, or nanometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "nano" is the prefix for billionths, or 10-9. Nanometers can be abbreviated as nm; for example, 1 nanometer can be written as 1 nm.

The nanometer is an extremely small unit of length measurement, often used to measure things that are very small, such as the transistors and electrical pathways in computer processors and nanotechnology.

Learn more about nanometers.

Kilometer to Nanometer Conversion Table

Table showing various kilometer measurements converted to nanometers.
Kilometers Nanometers
0.000000000001 km 1 nm
0.000000000002 km 2 nm
0.000000000003 km 3 nm
0.000000000004 km 4 nm
0.000000000005 km 5 nm
0.000000000006 km 6 nm
0.000000000007 km 7 nm
0.000000000008 km 8 nm
0.000000000009 km 9 nm
0.0000000000001 km 0.1 nm
0.000000000001 km 1 nm
0.00000000001 km 10 nm
0.0000000001 km 100 nm
0.000000001 km 1,000 nm
0.00000001 km 10,000 nm
0.0000001 km 100,000 nm
0.000001 km 1,000,000 nm
0.00001 km 10,000,000 nm
0.0001 km 100,000,000 nm
0.001 km 1,000,000,000 nm
0.01 km 10,000,000,000 nm
0.1 km 100,000,000,000 nm
1 km 1,000,000,000,000 nm


  1. Ambler Thompson and Barry N. Taylor, Guide for the Use of the International System of Units (SI), National Institute of Standards and Technology,

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