Board Feet Calculator

Last updated: April 5, 2026

The Board Feet Calculator converts lumber dimensions into board feet — the volumetric unit for pricing and ordering lumber at sawmills, hardwood dealers, and specialty yards. One board foot equals 144 cubic inches. Calculate for a single piece or full project cut list with a waste factor applied.

Calculator

Thicknessin

Widthin

Lengthin

Number of Boardspcs

Price per Board Foot$/BF

Results

Board Feet per Board

Total Board Feet

Total Cost

$18.00

Volume per Board

576

in³

Total Volume

0.3333

ft³

Total Lineal Length

Cost per Board

$18.00

Results

Board Feet per Board

Total Board Feet

Total Cost

$18.00

Volume per Board

576

in³

Total Volume

0.3333

ft³

Total Lineal Length

Cost per Board

$18.00

Most lumber yards price hardwood and specialty lumber by the board foot. Show up knowing your board feet and you can compare quotes from multiple suppliers accurately; show up without that number and you are at the mercy of the counter quote. The board feet calculator converts any list of lumber dimensions to total board feet instantly — for a single board or an entire project cut list.

Board Foot Formula

Board feet = Thickness (in) × Width (in) × Length (ft) ÷ 12

Examples: 1" × 6" × 8' = 4 BF; 2" × 8" × 12' = 16 BF; 4" × 4" × 10' = 13.33 BF. Use this online calculator for any piece or batch. The board foot calculator provides a single-piece interface; this calculator handles full project lists.

Nominal vs. Actual Dimensions: The Most Common Ordering Mistake

Lumber is sold using nominal (labeled) dimensions that are larger than the actual milled dimensions. For board feet calculations: softwood at big-box stores is often priced by the piece using nominal dimensions. Hardwood is priced by the board foot using actual rough-sawn dimensions — you pay for the wood you actually receive. Key actual dimensions: 1×4 actual = 0.75" × 3.5"; 1×6 = 0.75" × 5.5"; 2×4 = 1.5" × 3.5"; 2×6 = 1.5" × 5.5". Always confirm with your supplier which dimension basis they use for pricing.

Waste Factors by Project Type

Construction framing: 10–12% waste
Decking: 10–15% (plus end-cut waste)
Furniture and cabinetry: 20–25% (joinery cuts, figure selection, surfacing loss)
Hardwood flooring: 10–15% standard rooms; 15–20% diagonal or complex layouts
Wood turning: 30–40% (rough shape removal)

The board and batten calculator and woodworking calculators complete the project planning toolkit.

Visual Analysis

How It Works

Enter lumber thickness (inches), width (inches), and length (feet), plus number of pieces. Board feet per piece = thickness × width × length(ft) ÷ 12. Total board feet = board feet per piece × piece count. Enter multiple line items for a full project list. Apply a waste factor (default 10%) to get the total to order.

Understanding Your Results

A result of 1 board foot means you have a piece of wood with a volume equivalent to a 1″ × 12″ × 12″ board. Higher board foot counts indicate more material volume. For budgeting, multiply by your supplier's current price per board foot. Compare results across different dimension combinations to optimize cuts and minimize waste.

Worked Examples

Single Oak Board

Inputs

thickness1

width8

length96

quantity1

price per bf6.5

Results

board feet each5.333

board feet total5.333

total cost34.67

cubic inches768

cubic feet0.4444

A 1-inch thick, 8-inch wide, 8-foot long oak board yields 5.33 board feet at $6.50/BF costs $34.67.

Walnut Table Top (Multiple Boards)

Inputs

thickness1.75

width10

length120

quantity6

price per bf12

Results

board feet each14.583

board feet total87.5

total cost1050

cubic inches2100

cubic feet1.2153

Six 1¾″ × 10″ × 10′ walnut boards for a dining table top: 87.5 BF total at $12.00/BF = $1,050.

Frequently Asked Questions

A board foot is a unit of lumber volume equal to 144 cubic inches — a board that is 1 inch thick, 12 inches wide, and 12 inches long. It accounts for all three dimensions, unlike linear feet (length only) or square feet (area only). Formula: BF = thickness (inches) × width (inches) × length (feet) ÷ 12. This volumetric measure means thicker boards have more board feet at the same length. A 2" × 6" × 8' board has twice the board feet of a 1" × 6" × 8' board, because it contains twice the wood volume — and costs roughly twice as much per piece at the same species and grade.

Using nominal dimensions: 1 × 6 × 8 ÷ 12 = 4 board feet. Using actual dimensions (0.75" × 5.5"): 0.75 × 5.5 × 8 ÷ 12 = 2.75 board feet. The nominal calculation gives 4 BF; actual wood volume is only 2.75 BF — a 31% difference. At a hardwood dealer pricing by actual BF, you pay for 2.75 BF; at a softwood yard pricing by nominal BF for a standard pine 1×6, you pay for 4 BF equivalent. Common board feet for standard pieces: 2×4×8 = 5.33 BF nominal; 2×6×10 = 10 BF; 2×8×12 = 16 BF; 1×12×8 = 8 BF.

Linear feet measures only length — a 1×6×8 and a 1×12×8 are both 8 linear feet, ignoring width and thickness. Board feet measures volume: 1×6×8 = 4 BF; 1×12×8 = 8 BF. Linear feet is used for trim, moulding, and products sold by length regardless of cross-section. Board feet is used for dimensional lumber where you are paying for wood volume. Flooring uses square feet (coverage area). Plywood uses sheet count or square feet per sheet. For any purchase at a hardwood dealer or sawmill, board feet is the correct unit to quote.

Hardwood prices per board foot (2024 approximate ranges): common red oak (4/4, #1 common): USD 5–8/BF; hard maple (4/4, select): USD 8–12/BF; cherry (4/4, select): USD 9–14/BF; white oak (4/4, rift-sawn): USD 10–18/BF; black walnut (4/4, select): USD 12–20/BF; figured/curly walnut: USD 25–60+/BF. S2S (surfaced 2 sides) costs 15–25% more than rough-sawn. Buying in larger quantities (50+ BF) typically reduces per-BF cost by 10–25%. Local hardwood dealers versus online mills: shipping for heavy lumber usually favors local sourcing for quantities below 50–75 BF.

4/4 (read as 'four-quarter') is a hardwood thickness designation meaning 4 quarters of an inch = 1 inch nominal rough-sawn thickness. After surfacing (S2S), actual thickness is typically 13/16" to 7/8". Other common thicknesses: 5/4 = 1.25" rough / approximately 1.1" surfaced; 6/4 = 1.5" rough / approximately 1.3" surfaced; 8/4 = 2" rough / approximately 1.75" surfaced. Board feet are always calculated using the rough (nominal) thickness for pricing at hardwood dealers — even after surfacing reduces the actual thickness, you pay for the original rough-cut volume. 4/4 is standard for most furniture, cabinet face frames, and trim; 8/4 is used for table legs, turning blanks, and thick tabletops.

List every part in your project with dimensions (thickness × width × length). Calculate BF per part: thickness × width × length(ft) ÷ 12. Multiply by the number of each part. Sum all parts for total board feet. Add 20–25% waste for furniture (joinery cuts, surfacing loss, defect avoidance in figured wood). Example for a small coffee table: top (1" × 14" × 42"): 1 × 14 × 3.5 ÷ 12 = 4.08 BF × 1 = 4.08 BF; 4 legs (1.75" × 1.75" × 18" each): 1.75 × 1.75 × 1.5 ÷ 12 = 0.38 BF × 4 = 1.53 BF; total = 5.61 BF; with 25% waste = 7.0 BF to order. Divide by typical board length (say 8 feet) to estimate number of boards needed.

Sources & Methodology

NHLA (2023). Rules for the Measurement and Inspection of Hardwood and Cypress. USDA Forest Products Laboratory (2021). Wood Handbook: Wood as an Engineering Material. American Lumber Standard Committee (2023). Voluntary Product Standard PS 20.

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How It Works

Understanding Your Results

Worked Examples

Single Oak Board

Inputs

thickness1

width8

length96

quantity1

price per bf6.5

Results

board feet each5.333

board feet total5.333

total cost34.67

cubic inches768

cubic feet0.4444

A 1-inch thick, 8-inch wide, 8-foot long oak board yields 5.33 board feet at $6.50/BF costs $34.67.

Walnut Table Top (Multiple Boards)

Inputs

thickness1.75

width10

length120

quantity6

price per bf12

Results

board feet each14.583

board feet total87.5

total cost1050

cubic inches2100

cubic feet1.2153

Six 1¾″ × 10″ × 10′ walnut boards for a dining table top: 87.5 BF total at $12.00/BF = $1,050.

Frequently Asked Questions