Electromagnetic Wave Calculator Propagation Medium Medium: Vacuum (c) Water (n ≈ 1.333) Glass (n ≈ 1.52) Diamond (n ≈ 2.417) Custom Refractive Index (n) Custom Speed (v) Refractive Index (n): Speed (v): m/s km/s fraction of c Speed in Medium (v): --- m/s Calculate (v = f * λ) Enter a value in either Frequency or Wavelength below to calculate the other. Wavelength (λ): m (Meters) km (Kilometers) mm (Millimeters) µm (Micrometers) nm (Nanometers) Å (Ångströms) Frequency (f): Hz (Hertz) kHz (Kilohertz) MHz (Megahertz) GHz (Gigahertz) THz (Terahertz) Download Results as PDF