Anthracite
These have highest carbon content: 15000 BTU / lb.
Bituminous
10,500 – 15,500 BTH / lb.
Sub Bituminous
8,300 – 13,000 BTH / lb.
Lignite rank / Thermal Coal
4,000 – 8,300 BTU / lb.
Coal
These have highest carbon content: 15000 BTU / lb.
10,500 – 15,500 BTH / lb.
8,300 – 13,000 BTH / lb.
4,000 – 8,300 BTU / lb.