As homework we had to calculate the kJ to kWh from a meal.
As an example I chose Pizza Margherita (350g):
1kcal = 4.1868 kJ
1 kJ = 0.001163 kWh
840 kcal = 3516.912 kJ
3516.912 kJ = 4.0901687 kWh
For the calculation I used: from kcal/kJ to kWh - umrechnung.org
Emanuela D'Andrea, M17a