Energy converter
Joules, calories, kilocalories, kWh and BTU. Type in either box and the other updates.
1 kcal = 4.184 kJ
The same value in every unit
| Unit | Value |
|---|---|
| Joules (J) | 4,184 |
| Kilojoules (kJ) | 4.184 |
| Calories (cal) | 1,000 |
| Kilocalories (food calories) (kcal) | 1 |
| Watt-hours (Wh) | 1.1622 |
| Kilowatt-hours (kWh) | 0.001162 |
| British thermal units (BTU) | 3.9657 |
Energy conversions
How it’s calculated
Energy is converted through joules. A food calorie (kcal) is 4,184 J, a kilowatt-hour is 3.6 million J and the international BTU is about 1,055.06 J.