Lumber Calculator
Estimate lumber quantities and board feet for a project.
How It Works
Boards = ceil((Width × 12) ÷ Spacing). Board feet per board = (Nominal T × W × Length) ÷ 12.
Example
For a 12 ft × 8 ft area with 16 in spacing and 2×6 boards: 6 boards, 12 bf each, 72 bf total.
Frequently Asked Questions
What layout does this assume?
Boards run the length of the space and are spaced across the width, like decking or flooring.
What lumber size should I pick?
2×6 or 2×8 are common for decking. The size sets the board-feet estimate.
Does this include framing lumber?
No — this estimates the surface boards only, not joists, beams, or fasteners.