Overview
What Is an Energy Converter?
This tool converts energy measurements between Joules, calories, and kilowatt-hours, the common energy units.
Convert between Joules, calories, and kWh instantly.
This tool converts energy measurements between Joules, calories, and kilowatt-hours, the common energy units.
Useful for physics coursework, nutrition (food calories), and electrical energy calculations.
Input the energy value to convert.
Choose the unit you're converting from and to.
The converted value updates automatically.
1 calorie (small calorie) equals approximately 4.184 Joules.
Food 'Calories' (capital C) are actually kilocalories, 1000 times larger than the small calorie used in physics.
1 kWh equals 3,600,000 Joules (3.6 million Joules).
It's a practical-sized unit for typical household electricity consumption, unlike the very small Joule.
No, calculations happen entirely in your browser.
Yes, keep in mind food Calories are kilocalories - 1 food Calorie = 4184 Joules, not 4.184.
Results use standard conversion factors accurate to several decimal places.
Yes, converting between units helps compare different energy contexts (nutrition, electricity, physics).
Yes, completely free with no sign-up required.
British Thermal Unit, another energy unit sometimes used in heating/cooling contexts - not included in this specific converter but related conceptually.