Energy Converter

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What is Energy?

Energy is the capacity to do work or produce heat. The SI unit is the joule (J). Nutrition uses the calorie and the kilocalorie (4,184 joules), and electricity is billed in kilowatt-hours (kWh), each equal to 3.6 million joules.

Heating and air conditioning in the US are rated in BTU (British thermal units), about 1,055 joules each. Particle physics uses the electronvolt, and the energy sector compares fuels in tonnes of oil equivalent (toe).

Common energy units

UnitSymbolValue in joule
Joule J 1 J
Liter atmosphere l atm 101.325 J
Celsius heat unit Chu 1,899.101 J
Kilowatt hour kWh 3,600,000 J
Terajoule TJ 1 × 10¹² J
Kilojoule kJ 1,000 J
Centijoule cJ 0.01 J
Petajoule PJ 1 × 10¹⁵ J
Kiloton [explosive] kt 4.184 × 10¹² J
Gigacalorie [I.T.] Gcal 4,186,800,000 J
Kilocalorie [I.T.] kcal 4,186.8 J
Megawatthour MWh 3,600,000,000 J
Petawatthour PWh 3.6 × 10¹⁸ J
Gigajoule GJ 1,000,000,000 J

Frequently asked questions

How much is 1 liter atmosphere in joule?

1 liter atmosphere = 101.325 joule.

How much is 1 joule in celsius heat unit?

1 joule = 0.0005265651 celsius heat unit.

How much is 1 kilowatt hour in terajoule?

1 kilowatt hour = 3.6 × 10⁻⁶ terajoule.

What is the SI unit of energy?

The SI unit of energy is the joule (J). All other units in the table above are given as a multiple of it.

How many energy units can I convert?

This converter supports 101 energy units, from attojoule to zettawatthour. Choose any two of them to get the result, the formula and a conversion table.

Types of Energy