Energy

Convert between joules, calories, kWh, BTU

01

POPULAR CONVERSIONS

Joule → Calorie (thermochemical) 1 J = 0.239006 cal Calorie (thermochemical) → Joule 1 cal = 4.184 J Kilocalorie → Joule 1 kcal = 4,184 J Joule → Kilocalorie 1 J = 0.0002390057 kcal Kilowatt-hour → Joule 1 kWh = 3,600,000 J Joule → Kilowatt-hour 1 J = 2.778E-7 kWh British Thermal Unit → Joule 1 BTU = 1,055.06 J Joule → British Thermal Unit 1 J = 0.0009478171 BTU Kilocalorie → Kilowatt-hour 1 kcal = 0.0011622222 kWh Kilowatt-hour → Kilocalorie 1 kWh = 860.4207 kcal
02

ALL UNITS

Joule J

SI derived unit of energy
Kilojoule kJ

1,000 joules
Megajoule MJ

1,000,000 joules
Calorie (thermochemical) cal

Energy to raise 1 g water by 1°C (thermochemical)
Kilocalorie kcal

1,000 calories (food Calorie)
Watt-hour Wh

Energy of 1 watt sustained for 1 hour
Kilowatt-hour kWh

Common unit for electrical energy billing
British Thermal Unit BTU

Energy to raise 1 lb water by 1°F
Electronvolt eV

Energy gained by an electron through 1 volt potential
Therm thm

100,000 BTU, used in natural gas billing
Foot-pound ft·lbf

Energy to raise 1 pound by 1 foot