Energy Converter

The Energy Converter is an online calculation tool that converts between 11 types of energy units using the Joule (J) as the base unit from the International System of Units (SI). It supports calories (cal) and kilocalories (kcal) used in nutrition, watt-hours (Wh) and kilowatt-hours (kWh) used in electrical engineering, electronvolts (eV) and ergs used in physics, and BTUs and foot-pounds (ft·lbf) used in Anglo-American systems. All conversion results are displayed in a comprehensive table for easy comparison across different unit systems. Whether you need to calculate food energy content, convert electrical energy units, perform physics calculations, or compare electricity costs, this tool provides instant, accurate conversions. Running entirely in your browser means no installation is required—simply open it and start converting whenever you need it.