Convert between joules, calories, watt-hours, BTU, electronvolts, and more energy units.
The SI unit of energy. 1 joule is the energy transferred when 1 newton of force moves an object 1 meter.
Commonly used in food energy. 1 calorie = 4.184 joules. The "Calorie" on food labels is actually 1 kilocalorie.
Used for electrical energy. 1 watt-hour = 3600 joules. Your electricity bill uses kilowatt-hours (kWh).
Common in heating/cooling systems. 1 BTU ≈ 1055 joules. The energy needed to heat 1 pound of water by 1°F.