Convert Nanometers to Kilometers
1 nanometer (nm) equals 1 × 10⁻¹² kilometers (km).
1 nm = 1e-12 km
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk nanometer to kilometer converter to paste a column from Excel.
How to Convert Nanometer to Kilometer
- 1 nm = 1 × 10⁻¹² km
- 1 km = 1000000000000 nm
- Example: convert 15 nm to km: 15 nm = 15 × 1 × 10⁻¹² km = 1.5 × 10⁻¹¹ km
Formula
km = nm ÷ 1000000000000
Derivation from SI units:
- 1 nm = 10⁻⁹ m
- 1 km = 10³ m
- 1 nm = 1 × 10⁻⁹ m ÷ 1000 m per km = 1 × 10⁻¹² km
Both units are defined exactly, so the factor is exact. Nanometer definition: nanometer; Kilometer definition: kilometer.
Worked examples
- A reading of 20 nm converts to 2 × 10⁻¹¹ km.
20 nm × 1 × 10⁻¹² = 2 × 10⁻¹¹ km - A value of 500 nm is 5 × 10⁻¹⁰ km.
500 nm × 1 × 10⁻¹² = 5 × 10⁻¹⁰ km
Nanometer to Kilometer conversion table
| Nanometers (nm) | Kilometers (km) |
|---|---|
| 0.1 nm | 1 × 10⁻¹³ km |
| 1 nm | 1 × 10⁻¹² km |
| 2 nm | 2 × 10⁻¹² km |
| 5 nm | 5 × 10⁻¹² km |
| 10 nm | 1 × 10⁻¹¹ km |
| 20 nm | 2 × 10⁻¹¹ km |
| 50 nm | 5 × 10⁻¹¹ km |
| 100 nm | 1 × 10⁻¹⁰ km |
| 200 nm | 2 × 10⁻¹⁰ km |
| 380 nm | 3.8 × 10⁻¹⁰ km |
| 450 nm | 4.5 × 10⁻¹⁰ km |
| 500 nm | 5 × 10⁻¹⁰ km |
| 550 nm | 5.5 × 10⁻¹⁰ km |
| 650 nm | 6.5 × 10⁻¹⁰ km |
| 700 nm | 7 × 10⁻¹⁰ km |
| 780 nm | 7.8 × 10⁻¹⁰ km |
| 1000 nm | 1 × 10⁻⁹ km |
Where it's used
Nanometers are used for wavelengths of light (UV, visible, near-IR), while kilometers appear in road distances and speed (km/h). Both measure length and distance, so the conversion is a fixed factor.
Nanometer to other length units
| Conversion | 1 nm equals |
|---|---|
| nanometer to meter | 1 × 10⁻⁹ m |
| nanometer to kilometer | 1 × 10⁻¹² km |
| nanometer to centimeter | 1 × 10⁻⁷ cm |
| nanometer to millimeter | 0.000001 mm |
| nanometer to micrometer | 0.001 µm |
| nanometer to angstrom | 10 Å |
| nanometer to mile | 6.213711922 × 10⁻¹³ mi |
| nanometer to yard | 1.093613298 × 10⁻⁹ yd |
| nanometer to foot | 3.280839895 × 10⁻⁹ ft |
| nanometer to inch | 3.937007874 × 10⁻⁸ in |
| nanometer to mil | 0.00003937007874 mil |
| nanometer to nautical mile | 5.399568035 × 10⁻¹³ nmi |
Frequently asked questions
How many kilometers are in 1 nanometer?
1 nm = 1 × 10⁻¹² km.
How do I convert nanometers to kilometers?
Multiply the value in nm by 1 × 10⁻¹², or divide it by 1000000000000. For example, 15 nm × 1 × 10⁻¹² = 1.5 × 10⁻¹¹ km.
Is the nm to km conversion exact?
Yes. Both units are defined exactly, and 1 nm is exactly 1 × 10⁻¹² km.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Nanometers to Kilometers. Retrieved October 17, 2026, from https://scientificconverters.com/length/nanometers-to-kilometers/
IEEE
Scientific Converters, "Convert Nanometers to Kilometers," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/nanometers-to-kilometers/