Kilometers to Nanometers Converter
Enter the length in kilometers below to convert it to nanometers.
Convert Kilometers to Nanometers
Enter a value in kilometers (km) to convert to nanometers (nm).
Kilometers to Nanometers Conversion Chart (1–40 Continuous)
Continuous 1 to 40 kilometers lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.
| Kilometers (km) | Decimal (nm) | Fraction — Nearest 1/64 (Reduced) | Nearest 1/16 (Tape) |
|---|---|---|---|
1 km★ Common | 999,999,999,999.9999 nm | 999999999999.9999 nm | 999999999999.9999 nm |
2 km★ Common | 1,999,999,999,999.9998 nm | 1999999999999.9998 nm | 1999999999999.9998 nm |
3 km★ Common | 2,999,999,999,999.9995 nm | 2999999999999.9995 nm | 2999999999999.9995 nm |
4 km | 3,999,999,999,999.9995 nm | 3999999999999.9995 nm | 3999999999999.9995 nm |
5 km★ Common | 4,999,999,999,999.999 nm | 4999999999999.999 nm | 4999999999999.999 nm |
6 km★ Common | 5,999,999,999,999.999 nm | 5999999999999.999 nm | 5999999999999.999 nm |
7 km | 6,999,999,999,999.999 nm | 6999999999999.999 nm | 6999999999999.999 nm |
8 km★ Common | 7,999,999,999,999.999 nm | 7999999999999.999 nm | 7999999999999.999 nm |
9 km | 8,999,999,999,999.998 nm | 8999999999999.998 nm | 8999999999999.998 nm |
10 km★ Common | 9,999,999,999,999.998 nm | 9999999999999.998 nm | 9999999999999.998 nm |
11 km | 10,999,999,999,999.998 nm | 10999999999999.998 nm | 10999999999999.998 nm |
12 km★ Common | 11,999,999,999,999.998 nm | 11999999999999.998 nm | 11999999999999.998 nm |
How to Convert Kilometers to Nanometers
To convert kilometers to nanometers, multiply the length by the following conversion ratio: 999,999,999,999.9999 nanometers/kilometer.
Since one kilometer is equal to 999,999,999,999.9999 nanometers, you can use this simple formula to convert:
The length in nanometers is equal to the length in kilometers multiplied by 999,999,999,999.9999.
For example, here's how to convert 5 kilometers to nanometers using the formula above.
How Many Nanometers Are in a Kilometer?
There are 999,999,999,999.9999 nanometers in a kilometer, which is why we use this value in the formula above.
Our kilometer fraction and decimal calculator can convert kilometers and nanometers, and it automatically converts the results to US customary, imperial, and SI metric values.
Kilometers and nanometers are both units used to measure length. Keep reading to learn more about each unit.
What Is a Kilometer?
A kilometer is a unit of length equal to 1,000 meters (m), the base unit for length. Metric unit equal to 1,000 meters. [1]
The kilometer is classified as an International System of Units (SI) unit of length. Kilometers can be abbreviated as km; for example, 1 kilometer can be written as 1 km.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilometer (km) a convenient decimal multiple of the meter (m).
In practice, kilometers (km) are widely used across large-scale industrial, bulk, and macro-level length specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
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. [2]
The nanometer, or nanometre, is a multiple of the meter, 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.
Because 1 inch equals 25.4 millimeters and 1 millimeter equals 1,000,000 nanometers, there are exactly 25,400,000 nanometers in 1 inch (and 10 Angstroms in 1 nanometer).
The nanometer is an extremely small unit of length measurement, often used to measure things that are very small, such as the wavelengths of visible light (400 nm to 700 nm), the transistors and electrical pathways in computer processors, and thin-film nanotechnology.
When converting length between kilometers (km) and nanometers (nm), keep full floating-point precision (1 km = 999,999,999,999.9999 nm; 1 nm = 1e-12 km) during intermediate calculations and round only the final nanometer figure to match your instrument tolerance.
More Kilometer & Nanometer Conversions
Need to calculate in the opposite direction? Use our nanometers to kilometers calculator to switch your starting unit immediately. You can also explore related tools such as converting nanometers to kilometers, converting inches to nanometers, or converting meters to nanometers.
Convert from Kilometers
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Length Metrology Standard — Kilometers (km) to Nanometers (nm)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Kilometer (km) & Nanometer (nm)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (km to nm)