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Wavelength Converter

Convert between wavelength units: nanometers, micrometers, millimeters, centimeters, and meters.
Used in optics, physics, and radio engineering.

Type in any field — the others update instantly.

All conversions use meters (m) as the base unit.

Key conversion factors:

  • 1 nanometer (nm) = 0.000000001 m (10⁻⁹ m)
  • 1 micrometer (µm) = 0.000001 m (10⁻⁶ m)
  • 1 millimeter (mm) = 0.001 m
  • 1 centimeter (cm) = 0.01 m

Electromagnetic spectrum reference:

Type of Radiation Typical Wavelength
Visible light (violet) ~380 nm
Visible light (red) ~700 nm
Near infrared 0.7 – 2.5 µm
Mid infrared 2.5 – 25 µm
Microwave (Wi-Fi 2.4 GHz) ~125 mm
FM radio (100 MHz) ~3 m

Wavelength and frequency are inversely related: λ = c / f where c = speed of light (≈ 3 × 10⁸ m/s) and f = frequency in Hz.


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