About Energy Converter
Energy conversion is fundamental in physics, nutrition, engineering, and utility billing. Our free energy converter supports all major energy units, from the everyday calorie to the electron-volt used in particle physics.
Supported Energy Units
SI/Metric: Joule (J), Kilojoule (kJ), Megajoule (MJ), Gigajoule (GJ), Newton-meter (Nยทm). Heat/Caloric: Calorie (cal), Kilocalorie (kcal), British Thermal Unit (BTU), Therm (US). Electrical: Watt-hour (Wh), Kilowatt-hour (kWh), Megawatt-hour (MWh), Electron-volt (eV).
Common Energy Conversions
1 kilocalorie (food calorie) = 4,184 J = 4.184 kJ. 1 kWh = 3,600,000 J = 3.6 MJ. 1 BTU = 1,055.06 J = 0.293071 Wh. 1 therm = 100,000 BTU = 105.48 MJ.
Energy in Daily Life
Food energy: Nutrition labels use kilocalories (kcal), often labelled as 'Calories' (capital C). 1 food Calorie = 1 kcal = 4,184 J. Electricity bills: Energy consumption is billed in kilowatt-hours (kWh). 1 kWh = energy used by a 1,000-watt appliance for 1 hour. Heating: Natural gas and heating oil are measured in BTU or therms in the US. Physics: Particle physicists use electron-volts (eV). 1 eV = 1.602 ร 10^-19 J.