Energy Converter
Convert between energy units including Joules, calories, BTU, kWh, electronvolts, and more. Essential for physics, engineering, nutrition, and energy calculations.
Enter Energy Value
1 calorie = 4.184 Joules
1 kWh = 3,600,000 Joules = 3.6 MJ
1 BTU = 1,055.06 Joules
All Conversions
Real-World Energy Examples
Energy conversion is fundamental to understanding physics, engineering, nutrition, and everyday life. Energy exists in many forms and can be converted between different units depending on the context. This converter helps you convert between all common energy units used in science, engineering, and daily applications.
Understanding Energy Units
Common energy units and their uses:
- Joule (J): SI unit, used in physics and engineering worldwide
- Calorie (cal): Used in nutrition and chemistry, 1 cal = 4.184 J
- Kilocalorie (kcal): Food energy unit, what "Calories" on labels actually means
- BTU: British Thermal Unit, used for heating/cooling in the US
- kWh: Kilowatt-hour, standard unit for electricity billing
- Electronvolt (eV): Used in atomic and particle physics
- Foot-pound: Imperial unit for mechanical work
Energy Forms and Conversions
Key Energy Conversions
Energy in Daily Life
Energy consumption examples:
- Food: Average adult needs ~2,000 kcal/day = 8,368,000 J = 8.37 MJ
- Electricity: Average US home uses ~900 kWh/month = 3,240,000,000 J = 3.24 GJ
- Transportation: Car uses ~30-40 MJ per liter of gasoline
- Exercise: Running burns ~60-80 kcal/km = 250-335 kJ/km
- Appliances: LED bulb (10W) uses 36,000 J/hour, laptop (50W) uses 180,000 J/hour
Note: All conversions are mathematically exact based on standard conversion factors. Energy can be converted between different forms (e.g., electrical to thermal, chemical to kinetic), but the total energy in a closed system is conserved. When converting between units, ensure you're using the correct conversion factors for your specific application.
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