Energy
Joules to Calories
Convert between joules, calories, kilocalories, watt-hours and BTU. Food “calories” are kilocalories.
How this is calculated
- 1 cal = 4.184 J, 1 kcal = 4184 J
- 1 Wh = 3600 J, 1 kWh = 3,600,000 J
- 1 BTU = 1055.05585262 J
A food “Calorie” with a capital C is a kilocalorie — 1000 of the physics calorie. A 500 Calorie meal is 500 kcal, or about 2092 kJ.
Checked against known values
- 1 kcal = 4184 J
- 1 kWh = 3600000 J
- 1 BTU = 1055.055853 J
- 100 kcal = 418.4 kJ