📏 Board Dimensions — Add One or More Boards
Thickness (in)
Width (in)
Length (ft)
Qty
BF
$/BF
Enter price per board foot for total cost estimate
Enter a valid price.
Hardwood projects typically need 15–25% extra
Total Board Feet to Order
—
📋 Board-by-Board Tally
Was this calculator helpful?
Was this calculator helpful?
Sources & Methodology
Board foot formula is the NHLA (National Hardwood Lumber Association) industry standard, used universally throughout the US lumber industry. Cross-referenced with InchCalculator, OmniCalculator, and AdvantageLumber documentation.
InchCalculator — Board Footage Calculator
Formula verification: BF = T(in) × W(in) × L(in) ÷ 144 (all inches), or BF = T(in) × W(in) × L(ft) ÷ 12 (length in feet). 4/4 notation = quarters of an inch. Hardwood thickness notation guide used in this calculator.
OmniCalculator — Board Foot Calculator
Multi-board tally methodology, linear feet to board feet conversion formula, and price per board foot cost calculation approach used in this calculator.
AdvantageLumber — Board Foot Calculator Guide
Primary formula: BF = (Thickness in inches × Width in inches × Length in feet) ÷ 12. Waste factor guidance for hardwood projects (15–25%) verified from industry lumber dealer best practices.
Exact Formula (NHLA Industry Standard):
BF = Thickness (in) × Width (in) × Length (ft) ÷ 12 OR: BF = Thickness (in) × Width (in) × Length (in) ÷ 144 Total BF (with waste) = Sum of all board BF × Waste Factor Total Cost = Total BF × Price per BF One board foot = 12″ × 12″ × 1″ = 144 cubic inches of wood. 4/4 notation: 4/4 = 1 in, 5/4 = 1.25 in, 6/4 = 1.5 in, 8/4 = 2 in. Use actual dimensions, not nominal, for accuracy with hardwood.
BF = Thickness (in) × Width (in) × Length (ft) ÷ 12 OR: BF = Thickness (in) × Width (in) × Length (in) ÷ 144 Total BF (with waste) = Sum of all board BF × Waste Factor Total Cost = Total BF × Price per BF One board foot = 12″ × 12″ × 1″ = 144 cubic inches of wood. 4/4 notation: 4/4 = 1 in, 5/4 = 1.25 in, 6/4 = 1.5 in, 8/4 = 2 in. Use actual dimensions, not nominal, for accuracy with hardwood.
Last reviewed: April 2026
Board Footage Guide 2026 — What Is a Board Foot and How to Calculate It
Board footage is the primary unit of measurement used to price and sell hardwood lumber in the United States. Unlike dimensional lumber (2x4, 2x6), which is sold by the linear foot or piece, hardwood is sold by the board foot because it comes in variable widths and lengths. Understanding how to calculate board feet accurately is essential for any woodworking, furniture, or construction project.
💡 The simple formula: Board Feet = Thickness (inches) × Width (inches) × Length (feet) ÷ 12. One board foot = 1 inch thick × 12 inches wide × 12 inches long = 144 cubic inches of lumber. Example: 1″ × 6″ × 8 ft ÷ 12 = 4 board feet.
Hardwood Thickness (Quarter-Inch Notation)
Hardwood lumber thickness is measured in quarters of an inch, abbreviated as 4/4, 5/4, 6/4, etc. This notation is used because rough-sawn hardwood is not available in the exact thicknesses that dimensional lumber provides. When you buy “4/4” lumber, you are buying lumber that is nominally 1 inch thick (4 quarters = 1 inch). After drying and surfacing, it may be 13/16 inch or 15/16 inch thick.
| Notation | Nominal Thickness | Typical Surfaced (S2S) | Use Case |
|---|---|---|---|
| 4/4 | 1 inch | 13/16″ to 15/16″ | Tabletops, panels, shelving |
| 5/4 | 1.25 inches | 1-1/16″ to 1-1/8″ | Stair treads, thick tabletops |
| 6/4 | 1.5 inches | 1-5/16″ to 1-3/8″ | Heavy shelving, chair legs |
| 8/4 | 2 inches | 1-3/4″ to 1-7/8″ | Table legs, thick slabs, cutting boards |
| 10/4 | 2.5 inches | 2-1/4″ to 2-3/8″ | Thick turning blanks, workbench tops |
| 12/4 | 3 inches | 2-3/4″ to 2-7/8″ | Live-edge slabs, turning blanks |
Nominal vs. Actual Lumber Sizes — Using the Right Dimensions
A critical error in board footage calculations is using nominal dimensions (the label name) rather than actual dimensions (what you really get). Dimensional lumber from a home improvement store is sold as 2x4, 2x6, etc., but the actual dimensions are smaller after kiln drying and planing:
| Nominal (label) | Actual Dimensions | Board Feet (8 ft length) |
|---|---|---|
| 1×4 | 0.75″ × 3.5″ | 1.75 BF actual |
| 1×6 | 0.75″ × 5.5″ | 2.75 BF actual |
| 2×4 | 1.5″ × 3.5″ | 3.5 BF actual |
| 2×6 | 1.5″ × 5.5″ | 5.5 BF actual |
| 2×8 | 1.5″ × 7.25″ | 7.25 BF actual |
| 2×10 | 1.5″ × 9.25″ | 9.25 BF actual |
| 2×12 | 1.5″ × 11.25″ | 11.25 BF actual |
For hardwood, always use actual dimensions. For dimensional lumber purchased at big-box stores, actual dimensions are what matter for structural calculations, but nominal dimensions are often used for pricing comparison.
Board Feet to Linear Feet Conversion
Sometimes you know the board footage you need but want to order in linear feet. The conversion formula is: Linear Feet = Board Feet × 12 ÷ (Thickness × Width). Example: you need 50 board feet of 4/4 × 6-inch boards: 50 × 12 ÷ (1 × 6) = 100 linear feet of 1×6.
Hardwood Lumber Pricing by Species (2026)
| Species | Price per Board Foot (2026) | Common Grade | Notes |
|---|---|---|---|
| Poplar | $2–$4 | FAS / #1C | Best budget hardwood; good for paint-grade work |
| Red Oak | $4–$6 | FAS / #1C | Most widely used domestic hardwood; consistent color |
| Hard Maple | $5–$8 | FAS | Butcher blocks, flooring, workbench tops |
| White Oak | $6–$10 | FAS | Popular for furniture; tight grain; wine barrels |
| Cherry | $6–$12 | FAS | Rich color that darkens over time; popular for furniture |
| Walnut | $8–$15 | FAS | Premium domestic hardwood; dark chocolate color |
| Figured Maple | $10–$25 | Various | Curly or quilted figure; decorative panels and tops |
| Teak | $20–$40 | FAS | Outdoor furniture; naturally oil-rich; very durable |
Frequently Asked Questions
BF = Thickness (inches) × Width (inches) × Length (feet) ÷ 12. If all measurements are in inches: BF = T × W × L ÷ 144. Example: 1″ thick, 6″ wide, 8 ft long board: 1 × 6 × 8 ÷ 12 = 4 board feet. This is the NHLA (National Hardwood Lumber Association) industry standard formula used universally in the US lumber industry.
A board foot (bd ft or BF) equals a piece of wood 12″ long × 12″ wide × 1″ thick = 144 cubic inches of lumber. It is the primary unit used to price hardwood lumber in the US. One board foot is equivalent to 144 cubic inches of wood regardless of how the board is shaped.
Using actual dimensions (1.5″ × 3.5″ × 8 ft): 1.5 × 3.5 × 8 ÷ 12 = 3.5 board feet. Using nominal dimensions (2″ × 4″ × 8 ft): 2 × 4 × 8 ÷ 12 = 5.33 board feet. Hardwood is always priced by actual dimensions. Dimensional lumber pricing at stores typically uses the piece or linear foot, not board feet.
4/4 means 4 quarters of an inch thick = 1 inch nominal. The quarter-inch notation is used throughout the hardwood industry: 4/4 = 1″, 5/4 = 1.25″, 6/4 = 1.5″, 8/4 = 2″, 10/4 = 2.5″, 12/4 = 3″. After kiln drying and surfacing, actual thickness is slightly less than nominal (e.g., 4/4 surfaces to about 13/16″ to 15/16″).
Nominal size is the traditional label name (e.g., 2x4). Actual size is smaller due to drying and planing. 2×4 actual = 1.5″ × 3.5″. 2×6 actual = 1.5″ × 5.5″. 1×4 actual = 0.75″ × 3.5″. For accurate board footage calculations, always use actual dimensions. Using nominal dimensions overestimates volume by 20–40%.
Linear Feet = Board Feet × 12 ÷ (Thickness × Width). Example: 20 BF of 1″ × 6″ boards: 20 × 12 ÷ (1 × 6) = 40 linear feet. This tells you how many linear feet of that specific board size you need to equal the desired board footage.
Dimensional lumber for framing: add 10–15%. Furniture or cabinetry from common hardwood: add 15–20%. Premium or figured hardwood with grain selection: add 20–30%. Flooring: add 10–15%. The higher waste for hardwood reflects avoiding knots, defects, color variation, and selecting optimal grain orientation. Always order more than calculated — a second order may not match the original batch.
Common domestic hardwoods in 2026: poplar $2–$4/BF, red oak $4–$6/BF, hard maple $5–$8/BF, white oak $6–$10/BF, cherry $6–$12/BF, walnut $8–$15/BF. Premium species: figured maple $10–$25/BF, teak $20–$40/BF. Prices vary by region, grade, width, and figure. Always get a quote from your supplier with specific dimensions.
Square feet measures area (length × width, two dimensions). Board feet measures volume (length × width × thickness, three dimensions). A 1-inch board covering 10 sq ft = 10 board feet. A 2-inch board covering 10 sq ft = 20 board feet. Board feet is used for lumber because thickness matters to the volume of wood you are purchasing.
Use actual dimensions for accuracy. For hardwood, suppliers always use actual rough-sawn dimensions for board footage calculation. For dimensional lumber (2x4, 2x6, etc.), using nominal dimensions overestimates the wood volume by 20–40%. If your supplier is pricing by board feet, always confirm which dimensions they use in their calculation.
Calculate each component separately and sum: tabletop BF + leg BF + apron BF + shelf BF. Then add 20–25% for waste and grain selection. Example: 4-ft tabletop at 36″ wide from 8/4 walnut: 2″ × 36″ × 4 ft ÷ 12 = 24 BF raw. Add 25% waste = 30 BF to order. Four 2″ × 2″ × 3 ft legs: 4 × (2 × 2 × 3 ÷ 12) = 4 BF. Total: 34 BF needed.
FAS (Firsts and Seconds) is the highest grade of hardwood lumber per NHLA grading rules. FAS boards must be at least 6 inches wide and 8 feet long, with a minimum of 83-1/3% clear (defect-free) wood. Below FAS: #1 Common (66-2/3% clear), #2 Common (50% clear). Higher grades cost more but waste less in defect avoidance. For furniture, FAS or #1 Common is typical. For character or rustic work, #2 Common or below is used.
Related Construction Calculators
Popular Calculators
Stripe Fee Calculator
Finance
Pain & Suffering
Legal
TDEE Calculator
Health
Roofing Calculator
Construction
GPA Calculator
Education
Mortgage Refinance
Finance
CPM Calculator
Marketing
Markup Calculator
Finance
Carpet Calculator
Construction
Cbm Calculator
Construction
Dimensional Shipping Weight Calculator
Construction
Drywall Repair Cost Calculator
Construction