Energy Converter

Convert between different units of energy.

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Common Energy Conversions

• 1 kJ = 1,000 J
• 1 kcal = 4,184 J (food calorie)
• 1 kWh = 3,600,000 J = 3.6 MJ
• 1 BTU ≈ 1,055 J
• 1 calorie ≈ 4.184 J
• 1 Wh = 3,600 J
• 1 therm = 100,000 BTU

Reference Energies

• Food energy (1 kcal): 4,184 J
• Battery (AA): ~10,000 J (2.5 Wh)
• Gasoline (1 liter): ~34 MJ
• Household electricity (daily avg): ~30 kWh
• TNT (1 kg): ~4.6 MJ

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About Energy Measurement

Energy is the capacity to do work or produce heat. The SI unit of energy is the Joule (J), defined as the energy transferred when a force of one Newton moves an object one meter.

Common Energy Units

Joule: The SI unit used in physics and engineering.
Calorie: Used in chemistry and nutrition. The "food calorie" (written as Calorie with capital C) is actually a kilocalorie (kcal).
Kilowatt-hour: Used for electrical energy billing. It's the energy consumed by a 1 kW device running for 1 hour.
BTU: British Thermal Unit, used in heating, cooling, and energy industries in the US.

Food Calories

In nutrition, the "Calorie" listed on food labels is actually a kilocalorie (kcal) or 1,000 small calories. So a food item with "250 Calories" contains 250,000 calories (small c) or about 1,046,000 Joules.

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