# Energy conversion

Energy conversion is a free online calculator for converting metric and imperial units of energy. Conversion between joule, Btu, foot-pound force, horsepower-hour, kilowatt-hour, electronvolt, calorie, kilocalorie...
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joule (j) - SI unit of energy. Unit is named after James Prescott Joule. 1 joule = 1kg * m2 / s2
foot-pound force (ft lb) - unit of energy/work. 1 ft lp = 1.3558 joule
Btu - unit of energy. Today is Btu replaced with joule. 1 Btu = 1 055 joule
horsepower-hour (hph) - unit of energy. 1 hph = 2 684 520 joule
kilowatt-hour (kWh) - unit of energy. 1 kWh = 3 600 000 joule
watt-hour (Wh) - unit of energy. 1 Wh = 3 600 joule
watt-second (Ws) - unit of energy. 1 Ws = 1 joule.
calorie - most used unit of energy in food. 1 calorie = 4.1840 joule
kilocalorie - most used unit of energy in food. 1 kilocalorie = 4184 joule
electronvolt (eV) - unit of energy. 1 eV = 1.6021773e-19 joule
megaelectronvolt (MeV) - unit of energy. 1 MeV = 1.6021773e-13 joule
gigaelectronvolt (GeV) - unit of energy. 1 GeV = 1.6021773e-10 joule
kilojoule - unit of energy. Kilo prefix is a SI prefix, and means thousand.
megajoule - unit of energy. Mega prefix is a SI prefix, and means million.
gigajoule - unit of energy. Giga prefix is a SI prefix and means 109.
ergs - unit of energy. 1 erg = 0.0000001 joule 