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]: