|wood type||wood weight per load||4-hour burn||6 hour burn||8 hour burn||10 hour burn||total BTUs|
soft - Basswood, Cottonwood, etc.
medium - Shortleaf Pine, Red Cedar etc.
hard - Ash, Sugar Maple
extra-hard - Hickory, Locust
Oak can vary depending on species, and is usually either hard or extra hard. To see the densities of common wood species and relate it to the calculator, see this article.
(Last Column) - this represents the total BTU content of the full load of firewood. This calculator assumes well seasoned wood at approx. 20% moisture content. Since wood burning is BOTH an Art and a Science, your results will vary.