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
Btu - unit of energy. Today is Btu replaced with joule. 1 Btu = 1 055 joule
Energy conversion is a free online service for converting units of energy