Energy Converter
Convert between joule, kilojoule, calorie, kilocalorie, kWh, BTU, electronvolt, and more.
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All Conversions
Joule (J)3,600,000
Kilojoule (kJ)3,600
Megajoule (MJ)3.6
Calorie (cal)860,420.650096
Kilocalorie (kcal)860.42065
Kilowatt-hour (kWh)1
Watt-hour (Wh)1,000
BTU3,412.12822
Electronvolt (eV)22,469,432,668,058,746,000,000,000
Foot-pound (ft·lbf)2,655,219.719432
Frequently Asked Questions
How do I convert kilowatt-hours to joules?
Multiply kilowatt-hours by 3,600,000 to get joules. One kWh equals 3.6 megajoules (MJ), which is the energy used by a 1,000-watt appliance running for one hour.
What is the difference between a calorie and a kilocalorie?
A kilocalorie (kcal) equals 1,000 calories. Food labels list energy in kilocalories, often written as "Calories" with a capital C.
How many BTU are in a kWh?
One kilowatt-hour equals approximately 3,412 BTU. BTU (British Thermal Units) are commonly used to measure heating and cooling capacity.