Energy Converter
Convert energy units instantly. Switch between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, electronvolts and more.
Convert Energy
1 cal = 4.184 J
1 kcal = 4,184 J
1 kWh = 3,600,000 J
Result
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How to Use the Energy Converter
Convert energy units in three simple steps.
1. Enter energy
Type the energy value you want to convert.
2. Choose units
Select the original energy unit and the target unit.
3. View result
See the converted value and common energy equivalents instantly.
Fast energy conversion for science, nutrition and electricity.
This Energy Converter helps students, engineers, electricians, fitness users and everyday users convert energy values across physics, food, heating and electricity units with browser-based calculations.
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Energy Converter FAQ
Common questions about converting energy units.
How many joules are in one kilowatt-hour?
One kilowatt-hour equals exactly 3,600,000 joules.
How many joules are in one calorie?
One small calorie equals 4.184 joules. One food Calorie equals 4,184 joules.
What is BTU?
BTU means British thermal unit. It is commonly used for heating, cooling and energy measurement.
Does this converter use a backend?
No. All energy conversions run directly in your browser with HTML, CSS and JavaScript.