Construction

Board Foot Calculator

Calculate board feet for lumber purchasing, estimate costs, and plan your woodworking projects accurately.

Quick Answer:One board foot equals a piece of lumber 1 inch thick × 12 inches wide × 12 inches long (144 cubic inches). In 2026, the average price of kiln-dried hardwood lumber ranges from $4–$12 per board foot depending on species: red oak ~$5.50/BF, white oak ~$6.50/BF, walnut ~$9–$12/BF, maple ~$5–$7/BF, cherry ~$6–$8/BF.

Lumber Dimensions

Total Board Feet

Calculating... board feet (BF)

BF Per Piece

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Total Cost

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Cost Per Piece

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Total with Waste

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Visual Comparison

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Board Feet (with waste)—
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Total Cost (with waste)—

Expert Insight 2026 Pro Tip

Lumber buying tip for 2026: Always buy 15-20% more board feet than calculated to account for defects, waste, and mis-cuts — hardwood lumber often has wane edges, knots, and checks that reduce usable yield to 80-85%. In 2026, lumber prices have stabilized from the 2021-2022 pandemic spike: framing lumber (2×4 SPF) is ~$3-5 per 8ft piece, while hardwoods remain premium. Pro tip: buy rough-sawn lumber from local sawmills at 30-50% savings over S4S (surfaced four sides) from retail stores.

Board Foot Calculator Guide & FAQ

What is a board foot and how is it calculated?

A board foot (BF) is the standard unit for measuring hardwood lumber volume. Formula: Board Feet = (Thickness in inches × Width in inches × Length in feet) / 12. Alternatively: BF = (T × W × L) / 144 when all dimensions are in inches. One board foot = 144 cubic inches = a piece 1" × 12" × 12". Examples: A 1" × 6" × 8' board = (1 × 6 × 8) / 12 = 4 BF. A 2" × 8" × 10' board = (2 × 8 × 10) / 12 = 13.33 BF. For rough-sawn lumber, use actual dimensions. For surfaced (S4S) lumber, a "1 inch" board is actually 3/4" — but by convention, you still calculate using the nominal (pre-surfacing) thickness. Quarter-sawn and rift-sawn lumber is priced 15-30% higher per BF due to waste in milling.

How much does lumber cost per board foot in 2026?

2026 hardwood lumber prices per board foot (kiln-dried, S2S or better): Red Oak: $5-7/BF (most common US hardwood). White Oak: $6-8/BF (popular for furniture, whiskey barrels). Hard Maple: $5-7/BF (excellent for cutting boards, flooring). Cherry: $6-9/BF (prized for furniture, darkens with age). Walnut: $9-14/BF (premium pricing, beautiful grain). Ash: $4-6/BF (good value, similar look to oak). Poplar: $3-4/BF (excellent paint-grade wood). Exotic woods cost significantly more: Sapele $8-12/BF, Padauk $10-15/BF, Purpleheart $12-18/BF. Softwoods like pine and cedar are typically sold by the linear foot rather than board foot at home centers. Buying in bulk (100+ BF) usually earns a 10-15% discount from hardwood dealers.

How do I estimate lumber needs for a woodworking project?

Step 1: Create a cut list with exact dimensions for every piece. Step 2: Calculate board feet for each piece and sum them. Step 3: Add 15-20% for waste (cutting, defects, mistakes). Step 4: Add 5-10% if you need to match grain patterns. For furniture projects: a basic dining table (36" × 72") typically requires 25-35 BF for the top, 8-12 BF for the base/legs. A bookcase: 30-50 BF depending on size. Cutting boards: 2-4 BF each. Kitchen cabinets: roughly 50-80 BF per linear foot of cabinets. When buying rough lumber, it comes in random widths and lengths. Plan to need 25-30% extra compared to S4S lumber. In 2026, many hardwood dealers offer online ordering with photos of each board — useful for grain matching and minimizing waste on expensive species like walnut.

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