This page calculates many of the wavelength, frequency, and energy relationships based on a single value entered into any of the variables using the following formulas: f = c / λ λ = c / f e = h · f e = c · h / λ f = frequency in cycles per second c = speed of light: 299,792,458 meters per second λ = wavelength in meters e = energy in Joules h = Planck's constant: 6.6260695729 x 10^{-34} Joule · seconds Nanometers [nm]: Centimeters [cm]: feet [ft]: meters [m]: Hertz [Hz]: Kilohertz [KHz]: Megahertz [MHz]: Gigahertz [GHz]: Electron volts [eV]: Mega-electron volts [MeV]: ergs: Joules: