What is an Energy Converter?
The Energy Converter is a powerful online tool for converting between different units of energy. Whether you're working in physics, engineering, electrical systems, or nutrition, this tool provides accurate conversions between joules, kilowatt-hours, BTU, calories, and many more energy units.
Our converter supports 23+ energy units including SI units (joules, kilojoules, megajoules), electrical units (watt-hours, kilowatt-hours), thermal units (BTU, therms), food energy (calories, kilocalories), and scientific units (electron-volts). Perfect for engineers, scientists, students, and anyone working with energy measurements.
Key Features:
- Comprehensive Units: 23+ energy units including J, kJ, MJ, kWh, BTU, cal, kcal, eV
- Multiple Systems: SI, imperial/US, food energy, particle physics units
- Instant Results: Real-time conversion as you type
- High Precision: Adjustable decimal precision up to 4+ places
- Quick Conversions: One-click buttons for common scenarios
- Privacy Friendly: All calculations performed in your browser
Perfect For: Physicists, engineers, electricians, nutritionists, students, and anyone needing accurate energy unit conversions.
Frequently Asked Questions
What's the difference between joules and calories?
A joule (J) is the SI unit of energy, while a calorie (cal) is a traditional unit. 1 calorie = 4.184 joules. In nutrition, "Calories" (with capital C) are actually kilocalories (kcal): 1 Cal = 1,000 cal = 4,184 J.
How do I convert kWh to joules?
One kilowatt-hour (kWh) equals 3,600,000 joules or 3.6 megajoules (MJ). The formula is: kWh × 3,600,000 = joules. For example, 1 kWh = 3.6 MJ. This is commonly used for electricity billing.
What is a BTU and when is it used?
BTU (British Thermal Unit) is the energy needed to raise 1 pound of water by 1°F. 1 BTU = 1,055 joules. It's commonly used in the US for heating, cooling, and air conditioning system ratings (e.g., "12,000 BTU air conditioner").
How many calories are in a kilowatt-hour?
One kilowatt-hour equals 860,421 calories (cal) or 860.421 kilocalories (kcal/Cal). This conversion is sometimes used to compare electrical energy to food energy or metabolic output.
What is an electron-volt (eV)?
An electron-volt is a tiny unit of energy used in particle physics: 1 eV = 1.602 × 10⁻¹⁹ joules. It's the energy gained by an electron moving through 1 volt of electric potential. Common in atomic and nuclear physics.