Lumber & Board Foot Calculator
Price lumber accurately with board-foot math.
Lumber & Board Foot Calculator
Board Feet = Pieces x Length(ft) x Width(in) x Thickness(in) / 12
Calculated instantly
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What This Calculator Does
The Lumber & Board Foot Calculator computes the board feet in any pile of lumber. Because lumber is priced by board foot, this tool turns raw dimensions into the number used on the invoice.
How It Works
Board feet equal length in feet times width in inches times thickness in inches divided by 12. Multiplying by the piece count gives the total for the whole order.
Example
Ten pieces of 8-foot 6 x 1 lumber total 10 x (8 x 6 x 1 / 12) = 40 board feet.
Formula
Board ft = Pieces × (Length ft × Width in × Thickness in / 12)One board foot = 1 ft × 1 ft × 1 in.
Reading the Results
Total Board Feet
The full order volume in board feet, the number on the lumber invoice.
Board Feet per Piece
The single-piece volume, useful for comparing lumber options.
Frequently Asked Questions
What is a board foot?
It is the unit lumber is priced by: one foot long, one foot wide, and one inch thick, or 144 cubic inches of wood.
How do I calculate board feet?
Multiply length in feet by width in inches by thickness in inches and divide by 12. The tool handles multiple pieces automatically.
Does dimension lumber match nominal size?
No. A 2x4 is actually about 1.5 x 3.5 inches. For pricing use the nominal size, but for volume use actual dimensions.