Energy Converter
Convert energy units quickly and accurately with this free online tool.
Conversion Result
Energy Converter
The Energy Converter allows you to convert between commonly used energy units quickly and easily. It supports joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU and several other energy measurements.
Common Energy Units
Joule (J): The SI unit used to measure energy.
Kilojoule (kJ): Equal to 1,000 joules and commonly used for food energy and scientific measurements.
Calorie (cal): A traditional unit of energy.
Kilocalorie (kcal): Equal to 1,000 calories and commonly used when describing food energy.
Watt-hour (Wh): A unit of energy commonly used for electrical energy.
Kilowatt-hour (kWh): A widely used unit for measuring electrical energy consumption.
BTU: British Thermal Unit, commonly used in heating, cooling and energy applications.
Energy Conversion Formula
Useful Conversions
1 kJ = 1,000 J
1 MJ = 1,000,000 J
1 Wh = 3,600 J
1 kWh = 3,600,000 J
1 kcal = 4,184 J
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Frequently Asked Questions
What is the SI unit of energy?
The Joule (J) is the SI unit of energy.
How many joules are in one kilojoule?
One kilojoule is equal to 1,000 joules.
How many joules are in one kilowatt-hour?
One kilowatt-hour is equal to 3,600,000 joules.
Can I convert calories to kilojoules?
Yes. Select calories as the source unit and kilojoules as the target unit, then click Convert.
Can I convert kWh to Joules?
Yes. One kWh equals 3,600,000 joules.