joule is a derived unit of energy in the International System of Units.

  • A joule is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre(1 newton/metre or N⋅m).
  • It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second.
  • Where symbol kg is a kilogram, m is a metre, s is a second, N is a newton, Pa is a pascal, W is a watt,  and V is the volt, then the symbol J is for joule.


Electronvolt prefixes Abbreviation   eV to joules
millielectronvolt meV 1 eV = 0.001
electronvolt eV  1 eV = 1 eV
kiloelectronvolt keV 1x keV =1,000 eV
megaelectronvolt MeV 1x MeV = 1,000,000
gigaelectronvolt GeV 1x GeV = 1,000,000,000  1x GeV = 0.00000016021773
teraelectronvolt TeV 1x TeV = 1,000,000,000,000 1x TeV = 1.6021773e-7
petaelectronvolt PeV 1x PeV = 1,000,000,000,000,000 1x PeV = 0.00016021773
exaelectronvolt EeV 1x EeV =1,000,000,000,000,000,000 1x EeV = 0.16021773