Energy Converter: The Complete Guide
Convert energy instantly. Switch between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, and foot-pounds, and see the conversion rate both ways.
Who the Energy Converter is for
Students, engineers, and anyone converting energy between scientific and everyday units.
How to use the Energy Converter
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
Each unit has a fixed size in joules. The value is converted to joules, then to the target unit: result = value × (from-unit joules) ÷ (to-unit joules).
Features
- Joules, calories, kWh, BTU
- Food & electrical energy
- Two-way conversion rate
- Instant result
Energy units
Energy comes in many units: joules in physics, (kilo)calories on food labels, kilowatt-hours on electricity bills, and BTU in heating and cooling. They all measure the same thing. One food Calorie is a kilocalorie (4,184 joules), and one kWh is 3.6 million joules. This converter ties them all together.