Energy Converter
Convert Joules (J), Calories (cal), Kilowatt-hours (kWh) and BTU with scientific precision. Ideal for physics, nutrition, electrical calculations and engineering.
Energy Conversion Tool
How Energy Conversion Works
Energy can be measured using different units depending on the field of study. Joules are used in physics, calories are used in nutrition and heat, while kilowatt-hours are used in electrical energy billing.
This tool converts accurately between all major energy units using internationally accepted scientific constants.
- 1 calorie = 4.184 Joules
- 1 kWh = 3.6 million Joules
- 1 BTU = 1055.06 Joules
Whether you're a student, engineer, electrician, or nutritionist, this converter ensures fast and precise results.
FAQ — Energy Converter
1. How many joules are in 1 calorie?
1 thermochemical calorie = 4.184 J.
2. What is the most accurate energy unit?
The SI unit of energy is the Joule (J). All other units convert to Joules.
3. What is kWh commonly used for?
Kilowatt-hours are used to measure electrical energy consumption (home electricity bills).
4. Are calories and food calories the same?
Food labels use “Calorie (kcal)”, which equals 1000 small calories.
5. Is this converter accurate for physics?
Yes, the formulas use standard energy constants used in scientific calculations.