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The SI unit of energy is Joule [J].
Metric System
Unit
Converter
Joule [J]
1
Kilojoule [kJ]
1000
kilogram-meter [kgm]
9.80665
Megajoule [MJ]
1000000
watt-hour [Wh]
3600
kilowatt-hour [kWh]
3600000
Erg [erg]
1e-7
Imperial System
Unit
Converter
foot-poundal [ft pdl]
0.0421401
inch-pound force [in lbf]
0.112985
foot-pound force [ft lbf]
1.35582
horsepower-hour [hph]
2684519.54
British thermal unit [BTU]
1055.06
Calories
Unit
Converter
calorie [cal]
4.184
kilocalorie [kcal]
4184
Calories
Unit
Converter
electron volt [eV]
1.60218e-19
kiloelectron volt [keV]
1.60218e-16
megaelectron volt [MeV]
1.60218e-13
atomic mass unit [amu]
1.49242e-10
Hartree [Eh]
4.35974e-18
Rydberg [Ry]
2.17987e-18
Bohr magneton [μB]
9.27401e-24
Nuclear magneton [μN]
5.05078e-27
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Round up to the
4
digits after the decimal.
Metric System
Imperial System
Calories
Atomic