Energy Converter
Convert between joules, calories, kWh, BTU, and more.
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Frequently Asked Questions
How many calories in 1 joule?
1 joule equals approximately 0.239 calories. 1 kilocalorie (food calorie) equals 4,184 joules.
What is a BTU?
BTU stands for British Thermal Unit, the amount of energy needed to raise 1 pound of water by 1°F. Commonly used for heating and cooling.