Wood Calculator
Calculate lumber board feet (BF), linear footage, cubic volume, and material costs for woodworking, milling, and carpentry.
Estimated Lumber Cost: $450
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What Is a Wood Calculator?
A wood calculator computes board footage—the universal volume unit used by sawmills and hardwood suppliers. One board foot represents a piece of lumber 1 inch thick, 12 inches wide, and 12 inches long (144 cubic inches).
How to Use This Calculator
- Enter nominal board thickness and width in inches.
- Enter board length in feet.
- Enter number of pieces (Quantity).
- Optionally enter price per board foot to calculate total lumber cost.
Board Foot (BF) Formula
\text{Board Feet} = \frac{\text{Thickness (in)} \times \text{Width (in)} \times \text{Length (ft)}}{12} \times \text{Quantity}If length is measured in inches, divide the product of Thickness × Width × Length by 144.
Worked Example
Scenario: Purchasing 8 pieces of rough-sawn 8/4 (2-inch thick) walnut, 8 inches wide and 10 feet long, priced at $12.50 per board foot.
Board feet per piece: (2 in × 8 in × 10 ft) ÷ 12 = 160 ÷ 12 = 13.33 BF.
Total board feet (8 pieces): 13.33 × 8 = 106.67 BF.
Total cost: 106.67 BF × $12.50 = $1,333.38.
Tips & Key Notes
- Hardwood lumber is sold in quarter-inch thickness increments: 4/4 = 1", 5/4 = 1.25", 8/4 = 2", 12/4 = 3".
- Remember that surfaced lumber (S4S) has smaller actual dimensions than nominal: a 2x4 is actually 1.5" × 3.5". Hardwood is often sold rough-sawn.
- Add 15% to 20% waste when buying rough lumber to account for jointing, planing, knots, and sapwood defects.
Frequently Asked Questions
What is 1 board foot of wood?
One board foot (BF) is a volume measurement representing a solid board 1 inch thick, 12 inches wide, and 1 foot (12 inches) long, equaling 144 cubic inches.
How do you convert linear feet to board feet?
Multiply linear feet by thickness (in) and width (in), then divide by 12: Board Feet = Linear Feet × (Thickness × Width) ÷ 12.
How many board feet are in a standard 2x4x8 board?
Using nominal dimensions: (2 in × 4 in × 8 ft) ÷ 12 = 64 ÷ 12 = 5.33 Board Feet.
How many board feet are in a 2x6x12 board?
(2 in × 6 in × 12 ft) ÷ 12 = 144 ÷ 12 = 12.0 Board Feet.
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