Energy Converter Calculator
Enter an energy value in kilowatt-hours to see it instantly converted into joules, calories and BTU.
Energy Converter Calculator
Converts an energy value between kilowatt-hours, joules, calories and BTU all at once.
This calculator converts a single energy value, entered in kilowatt-hours, into joules, calories and BTU at once, using exact standard conversion factors — useful for comparing electricity bills, food energy and heating specifications given in different units.
Example
- With the default values shown above, this calculator returns: Kilowatt-Hours (kWh) ≈ 1.0000; Joules (J) ≈ 3,600,000; Calories (cal) ≈ 860,421; British Thermal Units (BTU) ≈ 3,412.14.
Frequently Asked Questions
How many joules are in a kilowatt-hour?
One kilowatt-hour equals exactly 3,600,000 joules (3.6 megajoules), since a kilowatt-hour is 1,000 watts sustained for 3,600 seconds.
Are food Calories the same as the calories shown here?
No — food labels use kilocalories (sometimes written as “Calories” with a capital C), which equal 1,000 of the small calories shown here. Divide the calorie result by 1,000 for food-label kilocalories.