Firewood is sold under a dozen names — cord, face cord, rick, stove cord, bush cord, truckload — and only one of them, the cord, has a fixed legal definition almost everywhere in the US: 128 cubic feet of stacked wood. Every other term takes its size from whatever the seller cut the logs to, which means the same word can describe very different amounts of wood from one yard to the next.
Cordwood Calculator exists to make that arithmetic instant and transparent: enter a quantity and a unit, get the cord-equivalent, and see the reasoning behind the conversion. The BTU comparison tool goes a step further, normalising quotes across species so a price per cord can be compared on the thing that actually matters — heat per dollar.
Nothing typed into the calculators leaves the browser. The site is free, supported by the ad slots you see on each page, and is not affiliated with any firewood seller, state agency, or weights-and-measures office.
Volume figures follow the cubic-foot definitions used in state weights-and-measures statutes. Species BTU values follow US Forest Service and state extension-service tables for wood seasoned to about 20 percent moisture. Figures are approximate — always confirm with your state office before relying on them in a dispute.