Energy Converter
Convert between Joules, Kilojoules, Kilowatt-hours (kWh), Kilocalories, and British Thermal Units (BTU).
Converted Energy
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How to Convert Energy & Work Units
- Enter your energy value.
- Select input: Joules (J), Kilojoules (kJ), Calories (cal), Kilocalories (kcal / food calories), Kilowatt-hours (kWh), or British Thermal Units (BTU).
- View equivalent energy output.
Energy Conversion Ratios
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1 kWh = 3,600,000 Joules (3.6 MJ) -
1 food calorie (kcal) = 4,184 Joules -
1 BTU ≈ 1,055.06 Joules
Example
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A 100W lightbulb running for 10 hours uses
1 kWh = 3.6 Megajoules.
Common Applications
- Home electricity billing kilowatt-hour to joule conversions.
- Nutritional energy burn comparisons.
- Air conditioner cooling capacity (BTUs to Watts/Joules).
Frequently Asked Questions
How many joules are in one kilowatt-hour?
There are exactly 3,600,000 joules (3.6 MJ) in one kilowatt-hour.
What is the difference between a small calorie and a food calorie?
A food calorie (often capitalized as Calorie or kcal) equals 1,000 thermodynamic small calories (4,184 joules).