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One kilocalorie (kcal) equals 4,184 joules. A kilocalorie is the unit commonly referred to as a Calorie (with a capital C) on food nutrition labels.

To convert kilowatt-hours to joules, multiply by 3,600,000. One kWh equals 3.6 million joules, as 1 kW = 1,000 W and 1 hour = 3,600 seconds.

A BTU (British Thermal Unit) is approximately 1,055 joules. It is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit.