Energy Converter
Convert between joules, watt-hours, calories, BTU, and more.
About Energy Conversion
Conversions use widely accepted factors (kWh↔MJ, BTU, calories) and are computed locally in your browser.
About this Energy Converter
Convert between joules, watt-hours, kilowatt-hours, calories, BTU, and more energy units. Our energy converter supports all common energy measurements used in physics, chemistry, nutrition, and engineering. Perfect for converting electrical energy, food energy, or any scenario requiring energy conversions. The tool provides accurate conversions with support for many energy units.
Key Features
Convert between joules, watt-hours, calories, BTU, and more
Support for scientific and practical energy units
Real-time conversion as you type
Bidirectional conversion
Accurate calculations
Support for many energy units
Easy unit switching
Works entirely in your browser for privacy
How to Use
Enter the energy value you want to convert
Select the source unit (e.g., kilowatt-hours)
Select the target unit (e.g., BTU)
View the converted value automatically
Switch units to convert in reverse
Use for any energy conversion needs
Copy converted values if needed
Convert between any supported units
Popular Use Cases
Convert electrical energy between units
Calculate food energy in different units
Convert energy for physics and chemistry
Calculate energy for engineering
Convert energy for international use
Understand energy in different units
Convert energy for utilities
Calculate energy consumption
Tips & Best Practices
1 kilowatt-hour = 3,600,000 joules = 3,412 BTU
1 calorie = 4.184 joules
1 BTU = 1,055.06 joules = 0.000293071 kilowatt-hours
Use joules for scientific calculations
Use kilowatt-hours for electrical energy
Use calories for food energy
Verify conversions for important calculations
Frequently Asked Questions
What energy units are supported?
The tool supports common energy units including joules, watt-hours, kilowatt-hours, calories, BTU (British Thermal Units), and electronvolts.
How accurate are the conversions?
Conversions are highly accurate, using standard conversion factors. The tool provides precise calculations for all supported units.
What's the difference between a calorie and a Calorie?
A calorie (cal) is 4.184 joules. A Calorie (capital C, also called kilocalorie) is 1,000 calories = 4,184 joules. Food labels typically use Calories (kilocalories).
What is a BTU?
BTU (British Thermal Unit) is a unit of energy equal to about 1,055 joules. It's commonly used in heating and cooling applications, especially in the United States.