Lumber Calculator: Board Feet, Weight & Cost
Calculate board feet, linear feet, lumber weight, and total project cost in seconds — built for framing, decking, fencing, and shed builds.
| Item | Quantity | Cost |
|---|
How to Calculate Board Feet of Lumber
The board foot is the universal unit for pricing and ordering dimensional lumber. One board foot equals 144 cubic inches — a piece that is 1 inch thick, 12 inches wide, and 12 inches long. Every lumber board feet calculator uses the same fixed formula regardless of species, grade, or moisture content.
To calculate board feet of lumber for a full project, multiply the per-board result by quantity, then add your waste factor. Most framing jobs carry 10% waste; angled or diagonal projects need 15–20%.
Lumber Price Calculator: Cost Breakdown by Species & Grade
A lumber cost calculator converts board feet into a real dollar figure once you know your local price per board foot. Pricing varies by species, grade, moisture content, and current supply conditions — the ranges below are general benchmarks, not fixed market quotes.
For bulk orders at the sawmill or wholesale yard, lumber is priced per thousand board feet (MBF). Use this lumber pricing calculator approach: multiply total board feet (including waste) by your price per board foot. To convert from an MBF quote, divide the MBF price by 1,000 to get your price per board foot.
| Lumber Type | Typical Low | Typical High | Common Use |
|---|---|---|---|
| Construction softwood (2×4, 2×6, 2×8) | $1.50/bf | $3.50/bf | Framing walls, floors |
| Pressure-treated decking boards | $2.00/bf | $4.50/bf | Outdoor decks & steps |
| Cedar / redwood (fencing & siding) | $3.00/bf | $6.50/bf | Fence pickets, siding |
| Douglas fir (structural) | $2.00/bf | $4.00/bf | Beams, headers, rafters |
| Hardwood — oak, maple, walnut | $5.00/bf | $14.00/bf | Furniture, flooring, trim |
Grade is the single biggest price driver: a clear, kiln-dried, knot-free board can cost double a utility-grade equivalent of the same species. Buying in bulk, ordering off-season, and sticking to standard dimensional sizes over custom-milled lumber are the most reliable ways to reduce your total lumber cost calculator estimate.
Board Feet & Lumber Weight Calculator Formula
The lumber weight calculator step matters for truck load limits, joist span ratings, shipping quotes, and structural load calculations. Weight is a function of species density and moisture content — two boards of identical dimensions in different species can vary by 30–50% in weight.
For a full order, multiply the per-board weight by quantity. The weight of lumber calculator on this page uses species density automatically based on your project type selection.
| Species | Density (lb/cu ft) | Typical Use | Weight per BF |
|---|---|---|---|
| Kiln-dried pine / fir | 28–32 | Framing | ~2.5 lb/bf |
| Pressure-treated pine | 34–40 | Decking, fencing | ~3.1 lb/bf |
| Cedar | 22–25 | Fencing, siding | ~2.0 lb/bf |
| Douglas fir (green) | 35–38 | Structural beams | ~3.0 lb/bf |
| Oak | 44–47 | Trim, furniture | ~3.8 lb/bf |
| Walnut | 36–40 | Furniture, flooring | ~3.2 lb/bf |
Price Per Thousand Board Feet (MBF): Lumber Pricing Calculator
MBF stands for thousand board feet — the standard unit used by sawmills, wholesale distributors, and large-volume suppliers. If your yard quotes a price per thousand calculator lumber figure, converting it to a per-board-foot price is straightforward.
Wholesale MBF pricing typically requires a minimum order of 1 MBF (one thousand board feet) or more. For smaller projects, retail per-board-foot pricing at a local yard is usually more practical. Enter your price per board foot directly in the calculator above — MBF conversion is automatic if you divide first.
Calculate Linear Feet of Lumber vs Board Feet: What's the Difference?
These two units serve different purposes, and mixing them up leads to ordering errors — especially when calculating lumber board feet for a project with multiple sizes.
Linear Feet
Measures length only — no width or thickness. Used for trim, moulding, fascia board, and any lumber sold by the running foot. A 2×4 and a 2×12 both have the same linear feet if they are the same length.
Use for: trim, moulding, fasciaBoard Feet
Accounts for thickness, width, and length — the standard unit for framing and dimensional lumber pricing. A 2×4 has far fewer board feet than a 2×12 of the same length. All framing lumber is priced per board foot at mills and yards.
Use for: framing, decking, beamsWhen suppliers sell trim or fascia by the linear foot, simply measure total run length and add 10% for joints and waste. When ordering framing lumber, always work in board feet to match how yards price bulk orders.
Lumber Calculator by Project Type
Each project type has different waste factors, board sizes, and secondary lumber requirements. Use our raw material cost calculator alongside this tool to combine lumber with hardware and other materials into a full project budget.
Framing Lumber Calculator
Stud spacing (16" or 24" on-centre) drives stud count directly. For a standard 8-ft wall at 16" OC, plan roughly 1 stud per linear foot of wall plus 3 extra per corner and 2 per door opening. Add top plate, bottom plate, and header stock as separate line items.
Waste: 10–15% on bearing wallsDeck Lumber Calculator
For straight decking, divide deck area by board coverage per piece (width × length). Add 15% for straight patterns, 20% for diagonal or herringbone. Don't forget joist lumber, rim boards, ledger, and post stock as separate calculations from the decking boards.
Waste: 15–20% on angled patternsFence Lumber Calculator
For privacy fencing, count the number of fence sections (total run ÷ post spacing), then calculate picket count per section (section width ÷ picket width with gap). Cedar, redwood, and pressure-treated pine are the standard species for fence pickets and rails.
Waste: 10–15% for privacy fenceShed Lumber Calculator
Calculate floor joists, wall framing, and roof rafters separately. Roof pitch significantly increases rafter length beyond the shed's width — a 4:12 pitch on a 10-ft wide shed needs rafters of approximately 6.3 ft each. Use our shed size calculator first to get exact dimensions.
Waste: 10–18% on steep pitchesWall Lumber Calculator
Door and window openings require additional header and jack-stud lumber that a simple linear-foot stud count misses. Every opening needs a doubled header (sized by span), two jack studs, and two king studs — add this stock separately to avoid running short on site.
Add: 1 header per openingLumber Takeoff Calculator
A full material lumber takeoff lists every board size separately rather than averaging. Mixed dimensions — 2×4, 2×6, 2×10, LVL beams — must each get individual board-foot calculations. Averaging sizes leads to systematic under-ordering on larger members.
List by size, not by averageLumber Size & Board Foot Reference Table
Use this reference to quickly estimate board feet per linear foot for common dimensional sizes without recalculating each time. All figures use actual (dressed) dimensions, not nominal.
| Nominal Size | Actual Size (in) | BF per Linear Foot | Common Use |
|---|---|---|---|
| 2×3 | 1.5 × 2.5 | 0.313 | Non-structural blocking |
| 2×4 | 1.5 × 3.5 | 0.583 | Wall studs, top/bottom plate |
| 2×6 | 1.5 × 5.5 | 0.688 | Decking, exterior walls |
| 2×8 | 1.5 × 7.25 | 0.906 | Floor joists, headers |
| 2×10 | 1.5 × 9.25 | 1.156 | Stairs, larger joists |
| 2×12 | 1.5 × 11.25 | 1.406 | Rim boards, large spans |
| 4×4 | 3.5 × 3.5 | 1.021 | Fence posts, deck posts |
| 4×6 | 3.5 × 5.5 | 1.604 | Structural beams |
| 6×6 | 5.5 × 5.5 | 2.521 | Heavy posts, pergolas |
Note: linear feet calculator lumber totals never account for board thickness or width. Two different sizes with identical length share the same linear feet but have very different board feet — which is exactly why dimensional lumber is priced per board foot, not per linear foot.
Frequently Asked Questions
Multiply thickness in inches by width in inches by length in feet, then divide by 12. One board foot equals 144 cubic inches. Multiply by quantity for a full order, then add 10–15% for waste. This is the standard method used to calculate a board foot of lumber for pricing and ordering, regardless of species.
Calculate board feet for one board (thickness × width × length ÷ 12), then multiply by total boards needed. Add 10% for straight-cut framing and up to 20% for angled or complex projects. Most suppliers price lumber per board foot or per thousand board feet (MBF) — this is how to calculate board feet for lumber at the full project order level.
Lumber weight depends on species density and moisture content. The formula is: Weight (lb) = (Board Feet ÷ 12) × Density (lb/cu ft). Kiln-dried softwoods average roughly 28–35 lb per cubic foot, while green or hardwood lumber runs significantly heavier. This matters for transport load limits, structural framing spans, and shipping cost estimates.
MBF stands for thousand board feet — the standard pricing unit used by sawmills and bulk suppliers. To get your per-board-foot price, divide the MBF quote by 1,000. To calculate total cost: (MBF Price ÷ 1,000) × Total Board Feet. For example, $800/MBF on a 350-board-foot order = $280 total material cost.
Linear feet measures only length — useful for trim or moulding sold by the running foot. Board feet accounts for all three dimensions (thickness × width × length), making it the standard unit for framing and dimensional lumber pricing. A 2×4 and a 2×12 of the same length have identical linear feet but very different board feet and costs.
Add 10% for straightforward framing runs, 15% for standard decking, and 20% for projects with many angled cuts such as deck stairs or fence corners. Warped boards, miscuts, and defects are common even in good-grade lumber, so ordering slightly over your calculated total avoids a costly second delivery.
Enter total wall length in linear feet, wall height, and stud spacing (16-inch or 24-inch on centre). The framing lumber calculator returns stud count, plate length, and total board feet for the wall frame. Add door and window openings separately — each needs a doubled header and additional jack and king studs not captured by a simple stud count.
Enter deck width, depth, and decking board width (typically 5.5 inches for a 2×6). The deck lumber calculator returns number of boards, linear feet, board feet, and estimated cost. Add 15% waste for straight decking and 20% for diagonal patterns. Calculate joist lumber, rim board, and ledger stock separately from the decking layer.