The classification of coal is generally based on the content of volatiles. However, the exact classification varies between countries. According to the German classification, coal is classified as follows:
| Name | Volatiles % | C Carbon % | H Hydrogen % | O Oxygen % | S Sulfur % | Heat content kJ/kg |
|---|---|---|---|---|---|---|
| Braunkohle (Lignite) | 45-65 | 60-75 | 6.0-5.8 | 34-17 | 0.5-3 | <28470 |
| Flammkohle (Flame coal) | 40-45 | 75-82 | 6.0-5.8 | >9.8 | ~1 | <32870 |
| Gasflammkohle (Gas flame coal) | 35-40 | 82-85 | 5.8-5.6 | 9.8-7.3 | ~1 | <33910 |
| Gaskohle (Gas coal) | 28-35 | 85-87.5 | 5.6-5.0 | 7.3-4.5 | ~1 | <34960 |
| Fettkohle (Fat coal) | 19-28 | 87.5-89.5 | 5.0-4.5 | 4.5-3.2 | ~1 | <35380 |
| Esskohle (Forge coal) | 14-19 | 89.5-90.5 | 4.5-4.0 | 3.2-2.8 | ~1 | <35380 |
| Magerkohle (Non baking coal) | 10-14 | 90.5-91.5 | 4.0-3.75 | 2.8-3.5 | ~1 | 35380 |
| Anthrazit (Anthracite) | 7-12 | >91.5 | <3.75 | <2.5 | ~1 | <35300 |
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