Energy Converter

Convert between every common energy unit. Pick the units, type a value, and the result updates instantly.

joules (J)kilojoules (kJ)kilocalories (kcal)kilowatt-hours (kWh)

joules (J)kilojoules (kJ)kilocalories (kcal)kilowatt-hours (kWh)

Energy units

Unit	Symbol	What it is
joule	J	The SI unit of energy.
kilojoule	kJ	1,000 J. Used on food labels in Australia and Europe.
kilocalorie	kcal	The food “Calorie”, exactly 4,184 J.
kilowatt-hour	kWh	Used on electricity bills: 1 kW for one hour.

Popular energy conversions

kilocalories to kilojoules kilojoules to kilocalories kilowatt-hours to joules