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Board Feet
—BF
Entrez les dimensions ci-dessus
With 10% Waste (BF)
—BF
Basé sur la densité de Lumber (0.5 t/vg³)
Calculatrice Gratuite de Lumber
Lumber Calculator: Board Feet Without the Headache
Enter your board dimensions and quantity into the lumber calculator above to instantly get total board feet, plus 2026 price estimates for your project.
Common Boards: Board Feet Reference
| 2Ă—4 Ă— 8 ft | 5.33 board feet |
| 2Ă—4 Ă— 10 ft | 6.67 board feet |
| 2Ă—6 Ă— 12 ft | 12 board feet |
| 4Ă—4 Ă— 8 ft (post) | 10.67 board feet |
Lumber Guide de Référence
Lumber Prices in 2026 (per Board Foot)
| Pine / fir framing lumber | $1.50 – $3.00 |
| Pressure-treated pine | $2.00 – $4.00 |
| Cedar / redwood | $3.00 – $8.00 |
| Oak / hardwood | $5.00 – $15.00 |
Prices are 2026 US averages. Actual costs vary by region and supplier.
Profondeurs recommandées pour Lumber
| Projet / Utilisation | Profondeur recommandée |
|---|---|
| 2Ă—4 (actual: 1.5" Ă— 3.5") | Standard framing |
| 2Ă—6 (actual: 1.5" Ă— 5.5") | Floor joists, walls |
| 2Ă—8 (actual: 1.5" Ă— 7.25") | Floor joists, rafters |
| 4Ă—4 (actual: 3.5" Ă— 3.5") | Posts, fencing |
Comment calculer le volume de Lumber
La plupart des fournisseurs vendent le lumber Ă la verge cube. Pour convertir la surface en verges cubes, utilisez cette formule :
Volume (cu yd) = (Length Ă— Width Ă— Depth) Ă· 27
Notre calculatrice multiplie également le résultat par 0.5 tonnes/vg³ (densité standard) pour estimer le poids.
Lumber Calculator: Board Feet Formula Explained
A board foot is a unit of volume equal to 144 cubic inches: a board 1 inch thick, 12 inches wide, and 12 inches long. To calculate board feet for any lumber, multiply thickness (inches) Ă— width (inches) Ă— length (feet), then divide by 12.
Lumber yards price hardwoods by the board foot, while framing lumber is typically priced per piece. Knowing board feet helps you compare prices across different board sizes and spot the best value for your project.
Conseils de pros
1
Lumber is sold by nominal dimensions (2Ă—4) but the actual size is smaller (1.5" Ă— 3.5"). Always use actual dimensions for precise project planning, but board feet are calculated from nominal sizes.
2
One board foot equals 144 cubic inches of lumber. The formula is: (Thickness in inches Ă— Width in inches Ă— Length in feet) Ă· 12.
3
Order 10-15% extra lumber beyond your calculated board feet. This accounts for knots, warping, cutting waste, and boards you will reject at the lumber yard.
4
Pressure-treated lumber costs 30-50% more than standard framing lumber but is essential for any wood that touches the ground or is exposed to weather.
Foire aux questions
How do you calculate board feet?â–Ľ
Multiply thickness (inches) Ă— width (inches) Ă— length (feet), then divide by 12. For example, a 2Ă—6 that is 10 feet long: (2 Ă— 6 Ă— 10) Ă· 12 = 10 board feet. Our lumber calculator above does this instantly for any quantity.
What is the difference between nominal and actual lumber sizes?â–Ľ
Nominal sizes (2Ă—4, 2Ă—6) are the names lumber is sold by. Actual sizes are smaller due to planing: a 2Ă—4 is actually 1.5" Ă— 3.5", a 2Ă—6 is 1.5" Ă— 5.5". Board feet are always calculated using nominal dimensions.
How many board feet are in a 2Ă—4Ă—8?â–Ľ
A standard 2Ă—4 that is 8 feet long contains 5.33 board feet: (2 Ă— 4 Ă— 8) Ă· 12 = 5.33. A 2Ă—4Ă—10 contains 6.67 board feet, and a 2Ă—4Ă—12 contains 8 board feet.
How much does lumber cost per board foot in 2026?â–Ľ
Framing lumber (pine/fir) runs $1.50 to $3.00 per board foot in 2026. Hardwoods range from $4 to $15+ per board foot depending on species. Cedar and redwood fall in the $3 to $8 range.
How much extra lumber should I order?â–Ľ
Order 10% extra for simple projects with straight cuts, and 15% for projects with many angles, notches, or complex joinery. You will always find boards with knots or warping that need to be rejected.