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 thm = 105,500,000 J 
1 J = 9.4787e-9 thm 
Exemple: 
Convertir 15 Thermie en Joule:
15 thm = 1,582,500,000 J 
| Thermie | Joule | 
|---|---|
| 0.01 thm | 1,055,000 J | 
| 0.1 thm | 10,550,000 J | 
| 1 thm | 105,500,000 J | 
| 2 thm | 211,000,000 J | 
| 3 thm | 316,500,000 J | 
| 5 thm | 527,500,000 J | 
| 10 thm | 1,055,000,000 J | 
| 20 thm | 2,110,000,000 J | 
| 30 thm | 3,165,000,000 J | 
| 40 thm | 4,220,000,000 J | 
| 50 thm | 5,275,000,000 J | 
| 60 thm | 6,330,000,000 J | 
| 70 thm | 7,385,000,000 J | 
| 80 thm | 8,440,000,000 J | 
| 90 thm | 9,495,000,000 J | 
| 100 thm | 10,550,000,000 J | 
| 250 thm | 26,375,000,000 J | 
| 500 thm | 52,750,000,000 J | 
| 750 thm | 79,125,000,000 J | 
| 1000 thm | 105,500,000,000 J | 
| 10000 thm | 1,055,000,000,000 J | 
| 100000 thm | 10,550,000,000,000 J |