About Energy Converter Tool
Published: Last Updated:
This Energy Converter converts between joules (J), kilojoules (kJ), megajoules (MJ), kilowatt-hours (kWh), calories (cal), kilocalories (kcal), BTU, foot-pounds (ft-lbf), and electron volts (eV). Useful for physics, nutrition, engineering, and electricity cost calculations.
Key Features
- Converts J, kJ, MJ, kWh, cal, kcal, BTU, ft-lbf, eV.
- Real-time conversion.
- Runs in your browser.
How to Use the Tool
- Enter an energy value.
- Select the input unit.
- All equivalents appear instantly.
Core Benefits
- Nutrition: understand the joule equivalent of food calories (1 kcal = 4,184 J).
- Electricity: calculate energy cost from kWh readings.
- Physics/engineering: convert between SI (joules) and other systems.
Common Use Cases
- Converting food energy from kcal (Calories) to kilojoules for EU nutrition labels.
- Calculating the energy in a household electricity bill (kWh to joules).
- Physics: converting thermal energy from BTU to joules for HVAC calculations.
Pro Tips
- 1 food Calorie (Cal) = 1 kilocalorie (kcal) = 4,184 joules.
- 1 kWh = 3,600,000 joules = 3.6 MJ. 1 BTU = 1,055.06 joules.
- In nutrition, "calories" always means kilocalories. A 500-calorie meal = 500 kcal = 2,092,000 J.
Use this free Energy Converter to instantly convert between units. Works in any browser on any device — no sign-up required.