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Convert actual lumber dimensions in inches—thickness, width, and length—into board feet using the standard 144 in³ rule, then multiply by how many identical pieces you need. Includes solid cubic feet for cross-checks with other volume estimates.
Last updated: April 17, 2026
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Use surfaced or actual dimensions (e.g. a “2×4” is often 1.5″ × 3.5″). 96 in = 8 ft.
Per piece (BF)
3.500
Total (BF)
28.000
Solid volume (ft³)
2.333 ft³
Notes:
Formula
T × W × L ÷ 144
Total BF
BF each × count
Solid volume
in³ ÷ 1728 × count
Eight pieces 1.5″ × 3.5″ × 96″ (actual “2×4” × 8′) — total board feet about:
28.000 BF
(2.333 ft³ solid)
Board feet measure volume in a woodworking-friendly unit. Multiply thickness, width, and length measured in inches, divide by 144, and you have board feet for one rectangular prism. Multiply by the number of identical pieces for a total. Cubic feet divides the same inch volume by 1728 cubic inches per cubic foot.
BF_one = (T × W × L) / 144BF_total = BF_one × quantity2.333 ft³
Compare to supplier quotes that list MBF, per-piece price, or per-board-foot tiers.
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