The Photon Energy Unit Converter gives the user a fast and simple way to convert between separate energy units that defines the energy of photons, mass particles and waves. The eight units implemented so far are Joule (energy), erg (energy), electronVolt (energy), Calorie (energy), gram (mass), meter (wavelength), Hertz (frequency) and Kelvin (temperature) as described below:

meter : f(λ) = hc/λ
λ = wavelength in meter
h = Planck constant
= 6.626e-34 Js
c = velocity of light in vacuum
= 299 792 458 m/s

Hertz : f(ν) = hν
ν = frequency in Hertz

Joule : Unit of energy in the International System (SI) of Units

erg : Unit of energy in the centimetre-gram-second (CGS) system of units
1 erg = 1e-07 J

electronVolt : Unit of energy equal to the amount of kinetic energy gained by a single unbound electron when it accelerates through an electric potential difference of one volt.
1 eV = 1.602e-19 J.

Kelvin : f(T) = kT
T = Temperature in Kelvin
k = Boltzmann constant
= 1.3806504e-23 J/K
kT is an energy-like quantity of central importance in various
areas of physics.

gram : E(m) = mc2
m = mass in gram

Calorie : Unit of energy needed to increase the temperature of 1 kilogram of water by 1° C.
1 Cal = 4184 J

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