BTU Content Comparisons of Common Fuels*
| Energy Source | Approximate BTU Content |
| Charcoal | 9,000 per pound |
| Wood, wet | 5,500 per pound |
| Wood, dry | 7,000 per pound |
| Coal | 10,000 per pound |
| Gasoline | 17,500 per pound |
| Propane | 15,000 per pound |
| Fuel Oil | 19,500 per pound |
| Diesel fuel | 21,500 per pound |
| Natural Gas | 1000 per cubic foot |
* taken from several public utility web sites