Firewood Cord Volume
How many cords a firewood stack holds: a full (standard) cord is 128 stacked cubic feet (a 4 x 4 x 8 ft rick), so cords = length x height x depth (log length) / 128. An 8 x 4 x 4 ft stack is exactly 1.00 cord; a 20 x 4 x 4 ft stack is 2.5. This is the legal cord under NIST Handbook 130 - firewood is sold by the cord, not by unregulated 'face cord', 'rick', or 'truckload'. Stacked volume includes air gaps; the state weights-and-measures office governs.
Formula and source
cords = length_ft x height_ft x depth_ft / 128; a full (standard) cord = 128 stacked cubic feet.
NIST Handbook 130, Uniform Regulation for the Method of Sale of Commodities (firewood sold by the cord = 128 ft^3).
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