Maße eingeben — Ergebnisse aktualisieren sich sofort. Formel: BF = (T in × W in × L ft) ÷ 12.
Maße eingeben — Ergebnisse aktualisieren sich sofort. Formel: BF = (T in × W in × L ft) ÷ 12.
Ein Board Foot ist ein Holzvolumen von 144 Kubikzoll. Man kann es auch als 1 ft² Fläche bei 1 Zoll Dicke oder als 1/12 Kubikfuß verstehen.
Da Bauholz oft in „1×, 2ד-Nennmaßen verkauft wird, aber auf etwas kleinere Istmaße gehobelt ist, verwenden viele Berechnungen die tatsächliche Dicke und Breite.
Ein nominales 2×4 misst nach Trocknung und Hobeln tatsächlich etwa 1.5 in × 3.5 in. Für BF-Schätzungen liefern Istmaße realistischere Summen. Die Voreinstellungen tragen typische gehobelte Maße ein.
Nützlich bei langen Strecken (BF/ft = T × W ÷ 12).
| Größe (Istmaß) | BF pro Fuß |
|---|---|
| 1×4 (0.75″ × 3.5″) | — |
| 1×6 (0.75″ × 5.5″) | — |
| 1×8 (0.75″ × 7.25″) | — |
| 2×4 (1.5″ × 3.5″) | — |
| 2×6 (1.5″ × 5.5″) | — |
| 2×8 (1.5″ × 7.25″) | — |
| 2×10 (1.5″ × 9.25″) | — |
| 2×12 (1.5″ × 11.25″) | — |
Calculate board feet in real-time as you type dimensions
Uses standard BF = (T × W × L) ÷ 12 calculation
Get instant price estimates for your lumber needs
Ein Board Foot (BF) ist ein Volumenmaß für Holz und entspricht 144 in³ (12 in × 12 in × 1 in). Der Rechner verwendet die Standardformel:
Werte aktualisieren sich während der Eingabe. Nutzen Sie Voreinstellungen für gängige gehobelte Maße (z. B. 2×4 tatsächlich 1.5 in × 3.5 in).
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Understanding the mathematical foundation behind board foot calculations
BF = (T × W × L) ÷ 12
T = Thickness in inches
W = Width in inches
L = Length in feet
BF = Board Feet
One board foot equals 144 cubic inches (12″ × 12″ × 1″). When we multiply thickness (inches) × width (inches) × length (feet), we get a result in "inch²-feet". Dividing by 12 converts this to board feet, the standard unit for lumber volume.
Start with dimensions
2×4 board, 8 feet long
Actual: 1.5″ thick × 3.5″ wide × 8′ long
Multiply dimensions
1.5 × 3.5 × 8 = 42
Divide by 12
42 ÷ 12 = 3.5 BF
Result: 3.5 Board Feet
Common lumber calculations you'll encounter in projects
Material: 5/4 × 6 decking
Actual Size: 1″ × 5.5″
Length: 12 feet
Quantity: 50 boards
(1 × 5.5 × 12) ÷ 12 = 5.5 BF
Total: 275 BF
Material: 2×4 studs
Actual Size: 1.5″ × 3.5″
Length: 8 feet
Quantity: 100 studs
(1.5 × 3.5 × 8) ÷ 12 = 3.5 BF
Total: 350 BF
Material: 8/4 oak
Actual Size: 2″ × 8″
Length: 6 feet
Quantity: 8 boards
(2 × 8 × 6) ÷ 12 = 8 BF
Total: 64 BF
Quick reference for common lumber sizes and their board foot values per linear foot
| Nominal Size | Actual Size | BF per Foot | BF per 8' | BF per 10' | BF per 12' |
|---|---|---|---|---|---|
| 1×4 | 0.75″ × 3.5″ | 0.219 | 1.75 | 2.19 | 2.63 |
| 1×6 | 0.75″ × 5.5″ | 0.344 | 2.75 | 3.44 | 4.13 |
| 1×8 | 0.75″ × 7.25″ | 0.453 | 3.63 | 4.53 | 5.44 |
| 2×4 | 1.5″ × 3.5″ | 0.438 | 3.50 | 4.38 | 5.25 |
| 2×6 | 1.5″ × 5.5″ | 0.688 | 5.50 | 6.88 | 8.25 |
| 2×8 | 1.5″ × 7.25″ | 0.906 | 7.25 | 9.06 | 10.88 |
| 2×10 | 1.5″ × 9.25″ | 1.156 | 9.25 | 11.56 | 13.88 |
| 2×12 | 1.5″ × 11.25″ | 1.406 | 11.25 | 14.06 | 16.88 |
Note: Values are based on actual (dressed) dimensions, not nominal sizes. Actual dimensions are slightly smaller due to planing and drying. Use these values for accurate material estimates.
Master the art of calculating board feet with our comprehensive guide
Most common method for lumber:
Example: (1.5 × 5.5 × 10) ÷ 12 = 6.875 BF Alternative method using inches:
Example: (1.5 × 5.5 × 120) ÷ 144 = 6.875 BF Quick calculation for long runs:
Example: (1.5 × 5.5) ÷ 12 = 0.6875 BF/ft
0.6875 × 10 ft = 6.875 BF