Converters Calculator
Energy Converter
Convert energy units including joules, kilojoules, calories, kilocalories, watt-hours, and BTU.
⚠️ Please enter a valid number.
Converted Energy
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Calculator guide
How this calculator works
How to use this calculator
Enter an energy value, choose the original energy unit, choose the target unit, then click Convert.
Formula used
The calculator converts the input into joules, then converts joules into the selected output unit.
Example calculation
1 kilowatt-hour equals 3,600,000 joules.
What the result means
The result shows the same amount of energy expressed in another unit.
Frequently asked questions
What is a kilowatt-hour?
A kilowatt-hour is an energy unit commonly used for electricity usage.
Are food calories included?
Yes. Kilocalories are included and are commonly used for food energy.
Is BTU included?
Yes. BTU is included for heating and cooling energy comparisons.