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Energy Conversion Units and Formulas

Energy Conversion Units

Metric Units

Joule (J)
Kilojoule (kJ)
Megajoule (MJ)
Gigajoule (GJ)
Millijoule (mJ)
Microjoule (μJ)
Nanojoule (nJ)
Attojoule (aJ)
Calorie (nutritional) (cal)
Kilocalorie (IT) (kcal (IT))
Kilocalorie (th) (kcal (th))
Calorie (IT) (cal (IT))
Calorie (th) (cal (th))
Kilowatt-hour (kWh)
Watt-hour (Wh)
Kilowatt-second (kW*s)
Watt-second (W*s)
Newton meter (N*m)
Kiloton (kton)
Megaton (Mton)
Gigaton (Gton)

Imperial & US Units

Horsepower (metric) hour (hp*h)
Horsepower hour (hp*h)
Btu (IT) (Btu (IT))
Btu (th) (Btu (th))
Foot-pound (ft*lbf)
Pound-force foot (lbf*ft)
Pound-force inch (lbf*in)
Inch-pound (in*lbf)
Inch-ounce (in*ozf)
Poundal foot (pdl*ft)
Ton (explosives) (ton)
Ton-hour (refrigeration) (ton-hour)
Fuel oil equivalent @kiloliter (fuel-oil-kiloliter)
Fuel oil equivalent @barrel (US) (fuel-oil-barrel)
Mega Btu (IT) (MBtu (IT))
Therm (therm)
Therm (US) (therm-us)

Electron-volt and Atomic Units

Megaelectron-volt (MeV)
Kiloelectron-volt (keV)
Electron-volt (eV)
Hartree energy (hartree)
Rydberg constant (rydberg)

Other Units

Erg (erg)
Dyne centimeter (dyn*cm)
Gram-force meter (gf*m)
Gram-force centimeter (gf*cm)
Kilogram-force centimeter (kgf*cm)
Kilogram-force meter (kgf*m)
Kilopond meter (kp*m)
Ounce-force inch (ozf*in)

Energy Conversion Formulas

Metric Units Conversion Formulas

Joule (J): 1 J = 1 J
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
Calorie (nutritional) (cal): 1 cal = 4186.8 J
Kilocalorie (IT) (kcal (IT)): 1 kcal (IT) = 4186.8 J
Kilocalorie (th) (kcal (th)): 1 kcal (th) = 4184 J
Calorie (IT) (cal (IT)): 1 cal (IT) = 4.1868 J
Calorie (th) (cal (th)): 1 cal (th) = 4.184 J
Kilowatt-hour (kWh): 1 kWh = 3,600,000 J
Watt-hour (Wh): 1 Wh = 3600 J
Kilowatt-second (kW*s): 1 kW*s = 1000 J
Watt-second (W*s): 1 W*s = 1 J
Newton meter (N*m): 1 N*m = 1 J
Kiloton (kton): 1 kton = 4,184,000,000,000 J
Megaton (Mton): 1 Mton = 4.184E+15 J
Gigaton (Gton): 1 Gton = 4.184E+18 J

Imperial & US Units Conversion Formulas

Horsepower (metric) hour (hp*h): 1 hp*h = 2,647,795.5 J
Horsepower hour (hp*h): 1 hp*h = 2,684,519.5368856 J
Btu (IT) (Btu (IT)): 1 Btu (IT) = 1055.05585262 J
Btu (th) (Btu (th)): 1 Btu (th) = 1054.3499999744 J
Foot-pound (ft*lbf): 1 ft*lbf = 1.3558179483 J
Pound-force foot (lbf*ft): 1 lbf*ft = 1.3558179483 J
Pound-force inch (lbf*in): 1 lbf*in = 0.112984829 J
Inch-pound (in*lbf): 1 in*lbf = 0.112984829 J
Inch-ounce (in*ozf): 1 in*ozf = 0.0070615518 J
Poundal foot (pdl*ft): 1 pdl*ft = 0.04214011 J
Ton (explosives) (ton): 1 ton = 4,184,000,000 J
Ton-hour (refrigeration) (ton-hour): 1 ton-hour = 12,660,670.23144 J
Fuel oil equivalent @kiloliter (fuel-oil-kiloliter): 1 fuel-oil-kiloliter = 40,197,627,984.822 J
Fuel oil equivalent @barrel (US) (fuel-oil-barrel): 1 fuel-oil-barrel = 6,383,087,908.3509 J
Mega Btu (IT) (MBtu (IT)): 1 MBtu (IT) = 1,055,055,852.62 J
Therm (therm): 1 therm = 105,505,600 J
Therm (US) (therm-us): 1 therm-us = 105,480,400 J

Electron-volt and Atomic Units Conversion Formulas

Megaelectron-volt (MeV): 1 MeV = 1.6021766339999E-13 J
Kiloelectron-volt (keV): 1 keV = 1.6021766339999E-16 J
Electron-volt (eV): 1 eV = 1.6021766339999E-19 J
Hartree energy (hartree): 1 hartree = 4.3597482E-18 J
Rydberg constant (rydberg): 1 rydberg = 2.1798741E-18 J

Other Units Conversion Formulas

Erg (erg): 1 erg = 1.0E-7 J
Dyne centimeter (dyn*cm): 1 dyn*cm = 1.0E-7 J
Gram-force meter (gf*m): 1 gf*m = 0.00980665 J
Gram-force centimeter (gf*cm): 1 gf*cm = 9.80665E-5 J
Kilogram-force centimeter (kgf*cm): 1 kgf*cm = 0.0980665 J
Kilogram-force meter (kgf*m): 1 kgf*m = 9.8066499997 J
Kilopond meter (kp*m): 1 kp*m = 9.8066499997 J
Ounce-force inch (ozf*in): 1 ozf*in = 0.0070615518 J