Complete List of Energy Units for Conversion

This guide provides a comprehensive list of energy units and their conversions to joules [J]. Whether you’re working with metric, imperial, or specialized energy units, this resource will help you make accurate conversions.

Metric Units of Energy

• Joule (J): The base unit of energy in the metric system.
• Kilojoule (kJ): 1 kJ = 1000 J
• Megajoule (MJ): 1 MJ = 1,000,000 J
• Gigajoule (GJ): 1 GJ = 1,000,000,000 J
• Millijoule (mJ): 1 mJ = 0.001 J
• Microjoule (µJ): 1 µJ = 1.0E-6 J
• Nanojoule (nJ): 1 nJ = 1.0E-9 J
• Attojoule (aJ): 1 aJ = 1.0E-18 J

Common Energy Units

• Kilowatt-hour (kWh): 1 kWh = 3,600,000 J
• Watt-hour (Wh): 1 Wh = 3,600 J
• Kilowatt-second (kWs): 1 kWs = 1000 J
• Watt-second (Ws): 1 Ws = 1 J
• Newton Meter (Nm): 1 Nm = 1 J
• Calorie (nutritional): 1 calorie = 4,186.8 J
• Kilocalorie (IT): 1 kcal (IT) = 4,186.8 J
• Kilocalorie (th): 1 kcal (th) = 4,184 J
• Calorie (IT): 1 cal (IT) = 4.1868 J
• Calorie (th): 1 cal (th) = 4.184 J

British Thermal Units

• Btu (IT): 1 Btu (IT) = 1,055.05585262 J
• Btu (th): 1 Btu (th) = 1,054.3499999744 J
• Mega Btu (IT): 1 MBtu (IT) = 1,055,055,852.62 J

Energy in Horsepower and Refrigeration

• Horsepower Hour (hp*h): 1 hp*h = 2,684,519.5368856 J
• Horsepower (metric) Hour: 1 horsepower hour = 2,647,795.5 J
• Ton-Hour (Refrigeration): 1 ton-hour = 12,660,670.23144 J

Electron-Volt and Related Units

• Electron-Volt (eV): 1 eV = 1.6021766339999E-19 J
• Kiloelectron-Volt (keV): 1 keV = 1.6021766339999E-16 J
• Megaelectron-Volt (MeV): 1 MeV = 1.6021766339999E-13 J

Larger Energy Units

• Gigawatt-hour (GWh): 1 GWh = 3,600,000,000,000 J
• Megawatt-hour (MWh): 1 MWh = 3,600,000,000 J
• Gigaton (Gton): 1 Gton = 4.184E+18 J
• Megaton (Mton): 1 Mton = 4.184E+15 J
• Kiloton (kton): 1 kton = 4,184,000,000,000 J
• Ton (explosives): 1 ton = 4,184,000,000 J

Miscellaneous Units

• Erg: 1 erg = 1.0E-7 J
• Dyne Centimeter (dyn*cm): 1 dyn*cm = 1.0E-7 J
• Pound-Force Foot (lbf*ft): 1 lbf*ft = 1.3558179483 J
• Pound-Force Inch (lbf*in): 1 lbf*in = 0.112984829 J
• Foot-Pound (ft*lbf): 1 ft*lbf = 1.3558179483 J
• Inch-Pound (in*lbf): 1 in*lbf = 0.112984829 J
• Poundal Foot (pdl*ft): 1 pdl*ft = 0.04214011 J
• Therm (EC, US): 1 therm = 105,505,600 J

Energy from Fuels

• Fuel Oil Equivalent @Kiloliter: 1 kiloliter = 40,197,627,984.822 J
• Fuel Oil Equivalent @Barrel (US): 1 barrel = 6,383,087,908.3509 J

Atomic and Quantum Units

• Hartree Energy: 1 Hartree energy = 4.3597482E-18 J
• Rydberg Constant: 1 Rydberg constant = 2.1798741E-18 J