Question: Has anyone done any research on the BTU content of black birch. We have quite a bit on our property, also sell firewood, burn wood and were wondering what it's content is? Thanx for any help you can give us. Answer: I'm sorry, I do not have that species listed. However, you may be interested in knowing that the BTU content of most all wood is approx 8000 BTU/Pound. So the density (weight per cubic foot) will be a good comparison to other woods. In other words, if it's seasoned weight is close to another popular species, it's BTU content PER CORD (or other cubic measurement) should be also.