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Energy Converter Calculator

Convert energy instantly between Joules, Kilojoules, Megajoules, Calories, Kilocalories, Watt-hours, Kilowatt-hours, Megawatt-hours, Electronvolts, BTU and Foot-pounds.

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Energy Conversion Calculator

Enter Energy Value

Convert From

Convert To

Converted Energy

⚡ Common Energy Conversions

Use these common energy conversion values as a quick reference.

1 Kilojoule 1 kJ = 1,000 J

1 Megajoule 1 MJ = 1,000,000 J

1 Gigajoule 1 GJ = 1,000,000,000 J

1 Calorie 1 cal = 4.184 J

1 Kilocalorie 1 kcal = 4,184 J

1 Watt-hour 1 Wh = 3,600 J

1 Kilowatt-hour 1 kWh = 3,600,000 J

1 BTU ≈ 1,055.06 J

1 Foot-pound ≈ 1.35582 J

Supported Energy Units

Joule (J)

Kilojoule (kJ)

Megajoule (MJ)

Gigajoule (GJ)

Calorie (cal)

Kilocalorie (kcal)

Watt-hour (Wh)

Kilowatt-hour (kWh)

Megawatt-hour (MWh)

Electronvolt (eV)

BTU

Foot-pound (ft⋅lb)

What is an Energy Converter?

An energy converter calculator converts a quantity of energy from one measurement unit into another. Different energy units are commonly used in physics, electricity, engineering, heating and nutrition.

The joule (J) is the SI unit of energy. Electrical energy is commonly expressed in watt-hours (Wh) or kilowatt-hours (kWh), while calories and kilocalories are commonly used when discussing heat and food energy.