Energy Converter

Joules, calories, kWh, BTU and electronvolts.

Popular energy conversions

Kilocalorie to Kilojoule1 kcal = 4.184 kJKilowatt-hour to Joule1 kWh = 3,600,000 JBritish thermal unit to Joule1 BTU = 1,055.05585 JCalorie to Joule1 cal = 4.184 JJoule to Kilocalorie1 J = 0.000239 kcal

Energy units reference

Values for 1 joule in every supported unit. Select any unit to open its converter.

UnitSymbol1 J =
KilojoulekJ0.001
MegajouleMJ0.000001
Caloriecal0.239006
Kilocaloriekcal0.000239
Watt-hourWh0.000278
Kilowatt-hourkWh2.777778e-7
ElectronvolteV6.241509e+18
British thermal unitBTU0.000948
Thermthm9.478171e-9
Foot-poundft·lb0.737562