A full cord of firewood measures 4 feet wide by 4 feet tall by 8 feet long (128 cubic feet). A typical 20-inch DBH tree that is 50 feet tall yields approximately 1 to 1.5 cords of split firewood. Larger trees yield significantly more, while the actual yield depends on species density, branch structure, trunk taper, and how much of the tree is usable. Hardwoods produce better firewood with higher BTU output per cord.
Typically 60-80% of total height is usable for firewood
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A large oak tree (30-inch DBH, 70 feet tall) can yield approximately 2.5-4 cords of split firewood. The actual yield varies based on how much of the trunk and major limbs are suitable for firewood, how much is lost to rot or damage, and how tightly the wood is stacked. Oak is an excellent firewood species with high BTU output.
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