Converters
Energy Converter
Convert between joules, calories, kWh, and more
Calculator
0.2390057361
1 Kilojoules = 0.2390057361 Kilocalories
Quick Conversions
Joules:1000
Kilowatt-hours:0.0002777777778
British:0.9478133945
Watt-hours:0.2777777778
Common Conversions
1 kcal = 4.184 kJ
1 kWh = 3.6 MJ
1 BTU = 1.055 kJ
1 kcal = 3.968 BTU
How to Use
Convert between energy units
1
Enter energy
Input joules, calories, kWh, BTU
2
Select from unit
Choose source unit
3
Select to unit
Choose target unit
4
Use result
Apply to physics, nutrition, energy bills
Energy Conversion
1 cal = 4.184 J | 1 kWh = 3.6 MJ | 1 BTU = 1055 J
Energy = capacity to do work. SI unit is joule (J). 1 J = 1 N·m = 1 W·s.
Frequently Asked Questions
1 calorie = 4.184 joules. 1 food Calorie (kcal) = 4,184 joules. Nutrition "calories" are kilocalories.
1 kWh = 3,600,000 joules = 3.6 MJ. Energy used by 1 kW device for 1 hour.
BTU = 1,055 joules. Energy to heat 1 pound of water by 1°F. Used for HVAC in US. 1 kWh ≈ 3,412 BTU.
Food "calories" are kilocalories (kcal). 1 kcal = 4.184 kJ. A 2000 calorie diet = 8,368 kJ.
Converters
Unit converters for length, weight, temperature, and more