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Energy Converter
Convert energy units.
Joules, calories, watt-hours, kWh, BTU. Free, no signup.
Frequently Asked Questions
1 calorie equals 4.184 joules. Note that food labels use kilocalories (Calories with a capital C), which equal 4184 joules.
1 kilowatt-hour equals 3,600,000 joules (3.6 megajoules).