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, kWh, calories, BTU, and more. For physics, utilities, and nutrition. All in your browser.
Key Features
Joules, Wh, kWh
Calories, BTU
Instant conversion
Works in browser
How to Use
Enter value
Select source and target units
View result
Popular Use Cases
Physics
Electricity bills
Nutrition (calories)
HVAC (BTU)
Frequently Asked Questions
What is a joule?
The SI unit of energy. 1 kWh = 3,600,000 joules. 1 calorie ≈ 4.184 joules.
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