Board feet in a 1×12×8
There are two honest answers. The wood you actually carry out of the store is 5.63 board feet — a 1×12 really measures 0.75″ × 11.25″. But if you're pricing or trading lumber, the industry counts this board as 8.00 BF, because board feet are by convention figured on the nominal 1″ × 12″ name.
The math, both ways
trade (nominal): 1″ × 12″ × 96″ ÷ 144 = 8.00 BF
Which one do you want? If you're figuring weight, volume, or "how much wood is that really," use 5.63. If you're comparing against hardwood priced per board foot, or reading a mill tally, use 8.00 — 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 1×12 is for
The 1×12 is the widest board most lumberyards stock, and it exists mostly for shelving — its 11-1/4″ actual depth matches standard closet shelves and covers a sheet-goods rip with no glue-up. Old New England houses used true 1-inch pine boards far wider than this; today anything past 12″ nominal means a specialty mill or a hardwood dealer.
Wide and thin is the cupping recipe: look down the length before buying, store it flat, and fasten shelves so the crown faces up — load flattens a slight crown, but deepens a cup.
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″ × 11.25″ section, a 8′ board holds 0.47 ft³ of wood — about 16 lb kiln-dried, and closer to 26 lb dripping fresh off the pressure-treated rack.
What that volume costs at hardwood prices
| Price per BF | Actual wood (5.63 BF) | Trade tally (8.00 BF) |
|---|---|---|
| $3.00 | $16.88 | $24.00 |
| $5.00 | $28.13 | $40.00 |
| $7.00 | $39.38 | $56.00 |
| $10.00 | $56.25 | $80.00 |