Board Foot Calculator

A volume unit: 144 cubic inches — picture a board 12" × 12" × 1" thick. The formula is thickness(in) × width(in) × length(in) ÷ 144, or the yard-friendly version this calculator uses with length in feet (÷ 12 instead). It exists because hardwood is sold rough in random widths and lengths — unlike construction lumber's standardized sticks — so volume is the only fair way to price a stack of unlike boards. Once you think in board feet, comparing $6/bf walnut to $4/bf oak becomes real math.

The quarters system states rough-sawn thickness in quarter inches: 4/4 ('four-quarter') is 1" rough, 8/4 is 2". Surfacing (planing) removes material — 4/4 surfaced two sides (S2S) arrives around 13/16" — and by convention you pay for the rough thickness, because that's what the sawyer cut. It's not a scam, but it bites project math: if a design needs a true 1" finished thickness, you're buying 5/4 stock. Order thickness by what you need after milling, not the label.

15–30%, and the range depends on the work: 15% for paint-grade or simple projects where any board placement works; 25–30% for furniture where grain matching, color consistency, and cutting around knots, checks, and sapwood consume real material. Hardwood defects don't announce themselves until you crosscut. The overage isn't waste — offcuts become test pieces for finish and joinery setups, which every project needs anyway. Buying exact quantities is how projects end with one drawer front that doesn't match.

Different market, different convention. Softwood construction lumber is standardized and sold by the piece in nominal sizes — a 2×4 measures 1.5" × 3.5" after drying and surfacing, a history-encrusted convention everyone's stopped fighting — and pricing is per stick, not per volume. Board feet govern the hardwood/sawmill world of random-width rough stock. If you're buying at a home center, think in pieces; the moment you walk into a hardwood dealer, this calculator is the native language.