Lumber Board Feet Calculator
Calculate board feet of lumber instantly. Enter thickness, width, and length to get total board footage for any wood project. Free online lumber board feet converter for construction and carpentry.
Board Foot Calculation
Board feet measure lumber volume in the hardwood industry. One board foot equals a board 1 inch thick, 12 inches wide, and 12 inches long (144 cubic inches). This standard unit enables fair pricing across different lumber dimensions.
Board Foot Formula
Board Feet = (Thickness × Width × Length) / 144
Dimensions in inches
Or: BF = (T × W × L) / 12 (L in feet)
Thickness and width use nominal dimensions, not actual. A 2×4 measures 1.5×3.5 inches actual but calculates as 2×4 for board feet. Length uses actual measurement.
Nominal vs Actual Dimensions
| Nominal Size | Actual Size (in) | Actual Size (mm) | BF per Foot |
|---|---|---|---|
| 1×4 | 0.75 × 3.5 | 19 × 89 | 0.29 |
| 1×6 | 0.75 × 5.5 | 19 × 140 | 0.46 |
| 2×4 | 1.5 × 3.5 | 38 × 89 | 0.58 |
| 2×6 | 1.5 × 5.5 | 38 × 140 | 0.92 |
| 2×8 | 1.5 × 7.25 | 38 × 184 | 1.21 |
| 2×10 | 1.5 × 9.25 | 38 × 235 | 1.54 |
| 2×12 | 1.5 × 11.25 | 38 × 286 | 1.88 |
| 4×4 | 3.5 × 3.5 | 89 × 89 | 1.02 |
Hardwood Pricing
Price per Board Foot
Common hardwoods (oak, maple): $3-8 per BF
Premium hardwoods (walnut, cherry): $8-15 per BF
Exotic woods: $15-50+ per BF
Softwoods typically sold by linear foot
Volume Discounts
Retail (under 100 BF): Full price
Small wholesale (100-500 BF): 10-15% discount
Large wholesale (500+ BF): 20-30% discount
Full bundle pricing varies by species
Grade Impact on Price
FAS (Firsts and Seconds): Highest price, minimal defects
Select: Good quality, small defects allowed
#1 Common: Utility grade, more defects
#2 Common: Economy grade, significant defects
Board Foot Calculation Examples
Example 1: Single Board
Dimensions: 2×6×8 feet
Board feet: (2 × 6 × 8) / 12 = 8 BF
At $5/BF: 8 × $5 = $40
Example 2: Multiple Boards
10 boards of 1×8×6 feet
Per board: (1 × 8 × 6) / 12 = 4 BF
Total: 10 × 4 = 40 BF
At $6/BF: 40 × $6 = $240
Example 3: Mixed Lumber Order
20 pieces 2×4×10: 20 × 6.67 = 133.4 BF
15 pieces 2×6×8: 15 × 8 = 120 BF
10 pieces 1×12×6: 10 × 6 = 60 BF
Total: 313.4 board feet
Example 4: Metric Conversion
Board: 50 mm × 150 mm × 3 m
Convert to inches: 2×6×10 feet
Board feet: (2 × 6 × 10) / 12 = 10 BF
1 BF = 0.00236 m³
Lumber Volume Conversions
Board Foot Equivalents
1 BF = 144 cubic inches
1 BF = 2,360 cubic cm
1 BF = 0.00236 cubic meters
1 cubic meter = 423.7 BF
Thousand Board Feet
1 MBF = 1,000 board feet
Used for large commercial orders
1 MBF ≈ 2.36 cubic meters
Common in wholesale trading
Cord Measurement
1 cord = 128 cubic feet
Firewood measurement
Approximately 800-900 BF
Varies by wood species
Shipping Weight
Oak: 4-5 lb per BF (green)
Maple: 3-4 lb per BF (green)
Pine: 2-3 lb per BF (green)
Kiln-dried weighs 30-40% less
Frequently Asked Questions
Why use nominal instead of actual dimensions?
Board foot calculations use nominal dimensions by industry standard. This accounts for material lost during planing and drying. Pricing remains consistent regardless of actual dimensions.
How do I convert board feet to linear feet?
Linear feet = (Board Feet × 12) / (Thickness × Width). For a 2×6: Linear feet = (BF × 12) / (2 × 6) = BF. One board foot of 2×6 equals one linear foot.
What is the difference between hardwood and softwood measurement?
Hardwoods sell by board foot. Softwoods typically sell by linear foot or piece. Construction lumber (2×4, etc.) prices per linear foot. Hardwood pricing reflects grading and quality variations.
How much waste should I allow for?
Add 15-25% for waste depending on project complexity. Straight cuts need less. Complex joinery needs more. Factor in defects, grain matching, and milling losses.
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