Board feet in a 1×6×8
There are two honest answers. The wood you actually carry out of the store is 2.75 board feet — a 1×6 really measures 0.75″ × 5.5″. But if you're pricing or trading lumber, the industry counts this board as 4.00 BF, because board feet are by convention figured on the nominal 1″ × 6″ name.
The math, both ways
trade (nominal): 1″ × 6″ × 96″ ÷ 144 = 4.00 BF
Which one do you want? If you're figuring weight, volume, or "how much wood is that really," use 2.75. If you're comparing against hardwood priced per board foot, or reading a mill tally, use 4.00 — the whole trade runs on nominal, for the historical reasons on our nominal vs actual page. (Construction lumber itself is usually priced per piece, so at the store neither number appears on the shelf tag.)
What a 1×6 is for
The 1×6 rides trends. For decades it was the standard dog-ear fence board and porch ceiling stock (beadboard and V-groove profiles start as 1×6). Then the farmhouse-shiplap wave made "1×6 shiplap" one of the most-searched lumber terms in America — most of it is just this board with rabbeted edges.
In furniture and shelving, a 1×6 is the widest common board that rarely cups badly on its own, which makes it a safe pick for beginners before they learn glue-up flattening.
Eight feet is the default length — it matches the ceiling, fits inside a pickup bed with the tailgate down, and wastes the least when cut for typical walls. It's usually the cheapest per foot, too, because it's the volume seller.
Heft check: at its true 0.75″ × 5.5″ section, a 8′ board holds 0.23 ft³ of wood — about 8.0 lb kiln-dried, and closer to 13 lb dripping fresh off the pressure-treated rack.
What that volume costs at hardwood prices
| Price per BF | Actual wood (2.75 BF) | Trade tally (4.00 BF) |
|---|---|---|
| $3.00 | $8.25 | $12.00 |
| $5.00 | $13.75 | $20.00 |
| $7.00 | $19.25 | $28.00 |
| $10.00 | $27.50 | $40.00 |