Because the density of wood varies by type, firewood is sold in cords rather than weight. A standard cord measures 8 feet long by 4 feet wide by 4 feet high 128 cubic feet.
After allowance for spaces between the pieces of stacked wood, a cord provides approximately 90 cubic feet of burnable wood.
The woods that emit the most heat when burned are those that are denser and air-dried. Hardwoods such as oak and almond burn longer, hotter and cleaner. Lighter woods like pine and cedar are better for kindling.
Once the fire has started and been allowed to burn for about 15 minutes, the denser wood can be added.
Keep in mind that some dense woods like Osage orange (hedge), mulberry and black locust are abundant and produce a lot of heat but throw off many sparks and embers. They are not recommended for use in a fireplace.
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