Lumber Cost Calculator

Why This One Is Different

When you price out a lumber list, board-foot pricing and single-stick retail pricing are two different units, and comparing them directly is exactly where budget estimates go wrong. This calculator converts your lumber list into total board feet, multiplies by a $/bf rate you set, and, because a bare board-foot rate is meaningless without an anchor, shows it against a sampled big-box retail price for a 2x4x8 stud ($4.15, Seattle-area, sampled 2026-08-15). That single stud computes to 5.33 board feet, meaning its retail price works out to roughly $0.78/bf; commodity dimensional lumber and premium or hardwood boards will price well above or below that anchor, so treat it as one data point, not a national average.

Where the Numbers Come From

• That board-foot number for a common stud isn't obvious at a glance: a nominal 2×4×8 computes to 5.33 board feet (2×4×8÷12), the closed-form definition applied on nominal dimensions. Source: lumber.ts engine convention
• That's a real, dated anchor to check other quotes against, not a guess: a sampled retail 2×4×8 KD-HT stud priced at $4.15 (big-box retail, Seattle-area store, sampled 2026-08-15) works out to about $0.78 per board foot for that specific SKU, one data point, not a national average. Source: hand-sampled materials basket, cost-data.json (per SPEC-AMENDMENTS B2: never presented as 'national average')
• The rate you choose is what actually moves your total, not the board-foot math: at a $1/bf rate, 100 board feet totals $100; the same 100 bf priced at the sampled stud's implied $0.78/bf totals $78. Source: worked example, closed-form arithmetic