Energy Converter

Convert joules, calories, kWh, BTU, and more — instantly.

Free energy unit converter. Convert J to cal, kJ to kcal, kWh to joules, and more. IT and thermochemical units labeled clearly. Use the express converter for any unit pair, or open a quick conversion below.

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1 joule = 0.2390057361 calories (thermochemical)

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Hand-picked pairs with dedicated converter pages — open one to convert instantly.

Joule → Calorie (Thermochemical)

Joule to Calorie (Thermochemical)

Calorie (Thermochemical) → Joule

Calorie (Thermochemical) to Joule

Kilojoule → Calorie (Nutritional / Food Calorie)

Kilojoule to Calorie (Nutritional / Food Calorie)

Calorie (Nutritional / Food Calorie) → Kilojoule

Calorie (Nutritional / Food Calorie) to Kilojoule

Joule → Kilojoule

Joule to Kilojoule

Kilojoule → Joule

Kilojoule to Joule

Kilowatt-Hour → Joule

Kilowatt-Hour to Joule

Joule → Kilowatt-Hour

Joule to Kilowatt-Hour

Calorie (Nutritional / Food Calorie) → Calorie (Thermochemical)

Calorie (Nutritional / Food Calorie) to Calorie (Thermochemical)

Calorie (Thermochemical) → Calorie (Nutritional / Food Calorie)

Calorie (Thermochemical) to Calorie (Nutritional / Food Calorie)

British Thermal Unit (IT) → Joule

British Thermal Unit (IT) to Joule

Joule → British Thermal Unit (IT)

Joule to British Thermal Unit (IT)

Kilowatt-Hour → British Thermal Unit (IT)

Kilowatt-Hour to British Thermal Unit (IT)

British Thermal Unit (IT) → Kilowatt-Hour

British Thermal Unit (IT) to Kilowatt-Hour

Watt-Hour → Joule

Watt-Hour to Joule

Joule → Watt-Hour

Joule to Watt-Hour

Kilojoule → British Thermal Unit (IT)

Kilojoule to British Thermal Unit (IT)

British Thermal Unit (IT) → Kilojoule

British Thermal Unit (IT) to Kilojoule

electronvolt → Joule

electronvolt to Joule

Joule → electronvolt

Joule to electronvolt

Foot-Pound → Newton Meter

Foot-Pound to Newton Meter

Newton Meter → Foot-Pound

Newton Meter to Foot-Pound

Browse all energy units

Pick any unit to open a two-way conversion. IT and thermochemical calories/BTUs are labeled separately; food Calorie = kcal.

From

JOULE

1 J = 0.2390057361 cal (th)

joule (J) → calorie (thermochemical) (cal (th)) calorie (thermochemical) (cal (th)) → joule (J)

KILOJOULE

1 kJ = 0.2390057361 Cal

kilojoule (kJ) → calorie (nutritional / food calorie) (Cal) calorie (nutritional / food calorie) (Cal) → kilojoule (kJ)

MEGAJOULE

1 MJ = 1,000,000 J

megajoule (MJ) → joule (J) joule (J) → megajoule (MJ)

GIGAJOULE

1 GJ = 1,000,000,000 J

gigajoule (GJ) → joule (J) joule (J) → gigajoule (GJ)

KILOWATT-HOUR

1 kW·h = 3,600,000 J

kilowatt-hour (kW·h) → joule (J) joule (J) → kilowatt-hour (kW·h)

WATT-HOUR

1 W·h = 3,600 J

watt-hour (W·h) → joule (J) joule (J) → watt-hour (W·h)

CALORIE (NUTRITIONAL / FOOD CALORIE)

1 Cal = 4.184 kJ

calorie (nutritional / food calorie) (Cal) → kilojoule (kJ) kilojoule (kJ) → calorie (nutritional / food calorie) (Cal)

KILOCALORIE (IT)

1 kcal (IT) = 4,186.8 J

kilocalorie (it) (kcal (IT)) → joule (J) joule (J) → kilocalorie (it) (kcal (IT))

KILOCALORIE (THERMOCHEMICAL)

1 kcal (th) = 4,184 J

kilocalorie (thermochemical) (kcal (th)) → joule (J) joule (J) → kilocalorie (thermochemical) (kcal (th))

CALORIE (IT)

1 cal (IT) = 4.1868 J

calorie (it) (cal (IT)) → joule (J) joule (J) → calorie (it) (cal (IT))

CALORIE (THERMOCHEMICAL)

1 cal (th) = 4.184 J

calorie (thermochemical) (cal (th)) → joule (J) joule (J) → calorie (thermochemical) (cal (th))

BRITISH THERMAL UNIT (IT)

1 Btu (IT) = 1,055.05585262 J

british thermal unit (it) (Btu (IT)) → joule (J) joule (J) → british thermal unit (it) (Btu (IT))

BRITISH THERMAL UNIT (THERMOCHEMICAL)

1 Btu (th) = 1,054.3499999744 J

british thermal unit (thermochemical) (Btu (th)) → joule (J) joule (J) → british thermal unit (thermochemical) (Btu (th))

FOOT-POUND

1 ft·lbf = 1.3558179483 N·m

foot-pound (ft·lbf) → newton meter (N·m) newton meter (N·m) → foot-pound (ft·lbf)

NEWTON METER

1 N·m = 0.7375621493 ft·lbf

newton meter (N·m) → foot-pound (ft·lbf) foot-pound (ft·lbf) → newton meter (N·m)

HORSEPOWER HOUR (MECHANICAL)

1 hp·h = 2,684,519.5368856 J

horsepower hour (mechanical) (hp·h) → joule (J) joule (J) → horsepower hour (mechanical) (hp·h)

HORSEPOWER (METRIC) HOUR

1 metric hp·h = 2,647,795.5 J

horsepower (metric) hour (metric hp·h) → joule (J) joule (J) → horsepower (metric) hour (metric hp·h)

MILLIJOULE

1 mJ = 0.001 J

millijoule (mJ) → joule (J) joule (J) → millijoule (mJ)

MICROJOULE

1 µJ = 0.000001 J

microjoule (µJ) → joule (J) joule (J) → microjoule (µJ)

NANOJOULE

1 nJ = 1e-9 J

nanojoule (nJ) → joule (J) joule (J) → nanojoule (nJ)

ATTOJOULE

1 aJ = 1e-18 J

attojoule (aJ) → joule (J) joule (J) → attojoule (aJ)

MEGAELECTRON-VOLT

1 MeV = 1.602177e-13 J

megaelectron-volt (MeV) → joule (J) joule (J) → megaelectron-volt (MeV)

KILOELECTRON-VOLT

1 keV = 1.602177e-16 J

kiloelectron-volt (keV) → joule (J) joule (J) → kiloelectron-volt (keV)

ELECTRON-VOLT

1 eV = 1.602177e-19 J

electron-volt (eV) → joule (J) joule (J) → electron-volt (eV)

ERG

1 erg = 1e-7 J

erg → joule (J) joule (J) → erg

GIGAWATT-HOUR

1 GW·h = 3.6e+12 J

gigawatt-hour (GW·h) → joule (J) joule (J) → gigawatt-hour (GW·h)

MEGAWATT-HOUR

1 MW·h = 3,600,000,000 J

megawatt-hour (MW·h) → joule (J) joule (J) → megawatt-hour (MW·h)

KILOWATT-SECOND

1 kW·s = 1,000 J

kilowatt-second (kW·s) → joule (J) joule (J) → kilowatt-second (kW·s)

WATT-SECOND

1 W·s = 1 J

watt-second (W·s) → joule (J) joule (J) → watt-second (W·s)

MEGA BRITISH THERMAL UNIT (IT)

1 MBtu (IT) = 1,055,055,852.62 J

mega british thermal unit (it) (MBtu (IT)) → joule (J) joule (J) → mega british thermal unit (it) (MBtu (IT))

TON-HOUR (REFRIGERATION)

1 ton·h = 12,660,670.23144 J

ton-hour (refrigeration) (ton·h) → joule (J) joule (J) → ton-hour (refrigeration) (ton·h)

FUEL OIL EQUIVALENT @ KILOLITER

1 kL oil eq = 40,197,627,984.822 J

fuel oil equivalent @ kiloliter (kL oil eq) → joule (J) joule (J) → fuel oil equivalent @ kiloliter (kL oil eq)

FUEL OIL EQUIVALENT @ BARREL (US)

1 bbl oil eq = 6,383,087,908.3509 J

fuel oil equivalent @ barrel (us) (bbl oil eq) → joule (J) joule (J) → fuel oil equivalent @ barrel (us) (bbl oil eq)

GIGATON (TNT)

1 Gton = 4.184e+18 J

gigaton (tnt) (Gton) → joule (J) joule (J) → gigaton (tnt) (Gton)

MEGATON (TNT)

1 Mton = 4.184e+15 J

megaton (tnt) (Mton) → joule (J) joule (J) → megaton (tnt) (Mton)

KILOTON (TNT)

1 kton = 4.184e+12 J

kiloton (tnt) (kton) → joule (J) joule (J) → kiloton (tnt) (kton)

TON (EXPLOSIVES / TNT)

1 ton TNT = 4,184,000,000 J

ton (explosives / tnt) (ton TNT) → joule (J) joule (J) → ton (explosives / tnt) (ton TNT)

DYNE CENTIMETER

1 dyn·cm = 1e-7 J

dyne centimeter (dyn·cm) → joule (J) joule (J) → dyne centimeter (dyn·cm)

GRAM-FORCE METER

1 gf·m = 0.00980665 J

gram-force meter (gf·m) → joule (J) joule (J) → gram-force meter (gf·m)

GRAM-FORCE CENTIMETER

1 gf·cm = 0.0000980665 J

gram-force centimeter (gf·cm) → joule (J) joule (J) → gram-force centimeter (gf·cm)

KILOGRAM-FORCE CENTIMETER

1 kgf·cm = 0.0980665 J

kilogram-force centimeter (kgf·cm) → joule (J) joule (J) → kilogram-force centimeter (kgf·cm)

KILOGRAM-FORCE METER

1 kgf·m = 9.8066499997 J

kilogram-force meter (kgf·m) → joule (J) joule (J) → kilogram-force meter (kgf·m)

KILOPOND METER

1 kp·m = 9.8066499997 J

kilopond meter (kp·m) → joule (J) joule (J) → kilopond meter (kp·m)

POUND-FORCE FOOT

1 lbf·ft = 1.3558179483 J

pound-force foot (lbf·ft) → joule (J) joule (J) → pound-force foot (lbf·ft)

POUND-FORCE INCH

1 lbf·in = 0.112984829 J

pound-force inch (lbf·in) → joule (J) joule (J) → pound-force inch (lbf·in)

OUNCE-FORCE INCH

1 ozf·in = 0.0070615518 J

ounce-force inch (ozf·in) → joule (J) joule (J) → ounce-force inch (ozf·in)

INCH-POUND

1 in·lbf = 0.112984829 J

inch-pound (in·lbf) → joule (J) joule (J) → inch-pound (in·lbf)

INCH-OUNCE

1 in·ozf = 0.0070615518 J

inch-ounce (in·ozf) → joule (J) joule (J) → inch-ounce (in·ozf)

POUNDAL FOOT

1 pdl·ft = 0.04214011 J

poundal foot (pdl·ft) → joule (J) joule (J) → poundal foot (pdl·ft)

THERM

1 therm = 105,505,600 J

therm → joule (J) joule (J) → therm

THERM (EC)

1 therm (ec) = 105,505,600 J

therm (ec) → joule (J) joule (J) → therm (ec)

THERM (US)

1 therm (us) = 105,480,400 J

therm (us) → joule (J) joule (J) → therm (us)

HARTREE ENERGY

1 Eh = 4.359748e-18 J

hartree energy (Eh) → joule (J) joule (J) → hartree energy (Eh)

RYDBERG CONSTANT

1 Ry = 2.179874e-18 J

rydberg constant (Ry) → joule (J) joule (J) → rydberg constant (Ry)