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A firewood calculator works out how many cords are in a stack of wood — full cords and face cords — from the stack's length, height and the log length. Firewood is sold by the cord, but the terms get fuzzy, and that is where buyers overpay.
Enter your stack size and it returns the volume in full cords (the legal unit, 128 ft³) and face cords (one log-length deep). Use it to check a delivery measures up to what you paid for.
Stacked volume = length × height × log length (all in feet); full cords = volume ÷ 128 ft³ (a 4 × 4 × 8 ft stack). A face cord is 4 ft high × 8 ft long by the log length, so a 16 in face cord is about one-third of a full cord. Stacked volume includes air gaps, as the cord definition does.
An 8 ft long, 4 ft high stack of 16 in logs is about 0.33 of a full cord — one face cord (a third of a full cord).