Ingresa las dimensiones — los resultados se actualizan al instante. Usa BF = (T in × W in × L ft) ÷ 12.
Ingresa las dimensiones — los resultados se actualizan al instante. Usa BF = (T in × W in × L ft) ÷ 12.
Un board foot es un volumen de madera equivalente a 144 pulgadas cúbicas. También puedes verlo como 1 ft² de superficie con 1 pulgada de grosor, o 1/12 de un pie cúbico.
Como la mayoría de la madera se vende en tamaños “1×, 2×” pero se cepilla a dimensiones reales ligeramente menores, muchos cálculos usan el grosor y ancho reales.
Un 2×4 nominal mide en realidad aprox. 1.5 in × 3.5 in tras el secado y cepillado. Para estimaciones de BF, usar tamaños reales da totales más realistas. Los preajustes de esta herramienta completan tamaños cepillados típicos.
Útil al estimar tramos largos (BF/ft = T × W ÷ 12).
| Tamaño (real) | BF por pie |
|---|---|
| 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
Un board foot (BF) es una medida de volumen para madera equivalente a 144 in³ (12 in × 12 in × 1 in). La calculadora usa la fórmula estándar:
Los valores se actualizan mientras escribes. Usa los preajustes para tamaños cepillados comunes (p. ej., 2×4 real 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