L'énergie est la capacité d'effectuer un travail.Il existe sous diverses formes, telles que cinétique, potentiel, thermique, etc. Il est mesuré en joules (J).
1 kcal = 0.004 MJ/s 
1 MJ/s = 239.006 kcal 
Exemple: 
Convertir 15 Kilocalorie en Megajoule par seconde:
15 kcal = 0.063 MJ/s 
| Kilocalorie | Megajoule par seconde | 
|---|---|
| 0.01 kcal | 4.1840e-5 MJ/s | 
| 0.1 kcal | 0 MJ/s | 
| 1 kcal | 0.004 MJ/s | 
| 2 kcal | 0.008 MJ/s | 
| 3 kcal | 0.013 MJ/s | 
| 5 kcal | 0.021 MJ/s | 
| 10 kcal | 0.042 MJ/s | 
| 20 kcal | 0.084 MJ/s | 
| 30 kcal | 0.126 MJ/s | 
| 40 kcal | 0.167 MJ/s | 
| 50 kcal | 0.209 MJ/s | 
| 60 kcal | 0.251 MJ/s | 
| 70 kcal | 0.293 MJ/s | 
| 80 kcal | 0.335 MJ/s | 
| 90 kcal | 0.377 MJ/s | 
| 100 kcal | 0.418 MJ/s | 
| 250 kcal | 1.046 MJ/s | 
| 500 kcal | 2.092 MJ/s | 
| 750 kcal | 3.138 MJ/s | 
| 1000 kcal | 4.184 MJ/s | 
| 10000 kcal | 41.84 MJ/s | 
| 100000 kcal | 418.4 MJ/s |