Lumber Board Foot Calculator: BF, Volume & Cost
Convert lumber dimensions and piece count into board feet, cubic volume and an optional material-value estimate. The calculator keeps the dimension basis explicit so rough and finished stock are not silently mixed.
Lumber dimensions
Board-foot result
How board feet are calculated
A board foot is a volume measure. With thickness and width in inches and length in feet, one board is calculated using:
Total board feet = board feet per piece × quantity
Worked example
A 2 × 6 × 8-foot board contains 8 board feet using the common board-foot formula: 2 × 6 × 8 ÷ 12 = 8 BF. Twenty such boards therefore represent 160 BF before any planning allowance.
Nominal versus actual dimensions
Lumber can be described by nominal size while the physical dressed dimensions are smaller. For commercial calculations, use the dimension convention on the supplier's quote, invoice or pricing basis instead of assuming every product is measured identically.
Waste is separate from board feet
Board feet describe the purchased or measured lumber volume. Cutting waste, defects and project-specific selection losses are separate planning considerations. The optional waste figure is therefore shown separately rather than changing the underlying board-foot measurement.
Why board feet and cubic volume are both useful
Board feet are common in lumber purchasing contexts, while cubic feet or cubic metres can make physical volume comparisons easier. Showing both helps users cross-check a calculation.
Frequently Asked Questions
What exactly is a board foot?
It is 144 cubic inches of lumber volume.
Does quantity affect BF per board?
No. It only scales the total.
Can I calculate cost?
Yes, using a user-supplied price per board foot.
Should waste be added to the measured BF?
It can be used as a planning allowance, but the actual project requirement depends on cuts, defects and usable stock.