ScientificConverters.com Precise unit conversions for science & engineering.

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    Convert Kilometers to Nanometers

    1 kilometer (km) equals 1000000000000 nanometers (nm).

    km
    Swap: convert nanometers to kilometers
    nm

    1 km = 1000000000000 nm

    Type in either box. Scientific notation works: 1.5e-3.

    Converting a list? Use the bulk kilometer to nanometer converter to paste a column from Excel.

    How to Convert Kilometer to Nanometer

    • 1 km = 1000000000000 nm
    • 1 nm = 1 × 10⁻¹² km
    • Example: convert 15 km to nm: 15 km = 15 × 1000000000000 nm = 15000000000000 nm

    Formula

    nm = km × 1000000000000

    Derivation from SI units:

    • 1 km = 10³ m
    • 1 nm = 10⁻⁹ m
    • 1 km = 1000 m ÷ 1 × 10⁻⁹ m per nm = 1000000000000 nm

    Both units are defined exactly, so the factor is exact. Kilometer definition: kilometer; Nanometer definition: nanometer.

    Worked examples

    1. A reading of 8 km converts to 8000000000000 nm.
      8 km × 1000000000000 = 8000000000000 nm
    2. A value of 50 km is 50000000000000 nm.
      50 km × 1000000000000 = 50000000000000 nm

    Kilometer to Nanometer conversion table

    Kilometer to Nanometer conversion table
    Kilometers (km)Nanometers (nm)
    0.1 km100000000000 nm
    0.5 km500000000000 nm
    1 km1000000000000 nm
    1.5 km1500000000000 nm
    2 km2000000000000 nm
    3 km3000000000000 nm
    5 km5000000000000 nm
    8 km8000000000000 nm
    10 km10000000000000 nm
    15 km15000000000000 nm
    20 km20000000000000 nm
    21.0975 km21097500000000 nm
    25 km25000000000000 nm
    42.195 km42195000000000 nm
    50 km50000000000000 nm
    80 km80000000000000 nm
    100 km100000000000000 nm
    160 km160000000000000 nm
    200 km200000000000000 nm
    500 km500000000000000 nm
    1000 km1 × 10¹⁵ nm

    Where it's used

    Kilometers are used for road distances and speed (km/h), while nanometers appear in wavelengths of light (UV, visible, near-IR). Both measure length and distance, so the conversion is a fixed factor.

    Kilometer to other length units

    1 km expressed in every length unit
    Conversion1 km equals
    kilometer to meter 1000 m
    kilometer to centimeter 100000 cm
    kilometer to millimeter 1000000 mm
    kilometer to micrometer 1000000000 µm
    kilometer to nanometer 1000000000000 nm
    kilometer to angstrom 10000000000000 Å
    kilometer to mile 0.6213711922 mi
    kilometer to yard 1093.613298 yd
    kilometer to foot 3280.839895 ft
    kilometer to inch 39370.07874 in
    kilometer to mil 39370078.74 mil
    kilometer to nautical mile 0.5399568035 nmi

    Frequently asked questions

    How many nanometers are in 1 kilometer?

    1 km = 1000000000000 nm.

    How do I convert kilometers to nanometers?

    Multiply the value in km by 1000000000000. For example, 15 km × 1000000000000 = 15000000000000 nm.

    Is the km to nm conversion exact?

    Yes. Both units are defined exactly, and 1 km is exactly 1000000000000 nm.

    Sources

    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 Kilometers to Nanometers. Retrieved October 17, 2026, from https://scientificconverters.com/length/kilometers-to-nanometers/

    IEEE

    Scientific Converters, "Convert Kilometers to Nanometers," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/kilometers-to-nanometers/