Calculate lumber volume in board feet from actual thickness, width, length, quantity, mixed units, extra material, and optional board-foot pricing.
A board foot is volume, not length or surface area: one inch thick by twelve inches wide by twelve inches long, equal to 144 cubic inches or one-twelfth cubic foot.
CalcRocket converts every dimension to meters, calculates physical volume, then converts that one canonical volume to board feet.
board feet = thickness (in) × width (in) × length (ft) ÷ 12thickness × width × length, after converting every dimension to metersrow total = board feet each × quantityrecommended board feet = base board feet × (1 + extra % ÷ 100)recommended board feet × price per board footA 2 in × 8 in × 10 ft board contains 13.333 board feet.
Ten 1 in × 6 in × 8 ft boards contain 40 board feet; with 10% extra, the recommendation is 44 board feet.
For 25 mm × 150 mm × 2.4 m lumber, the calculator normalizes all dimensions before calculating each-board and quantity totals.
Inputs are never silently changed from nominal to surfaced dimensions.
Select the unit printed or measured for each dimension; raw mixed numbers are never multiplied together.
Project-level cost uses the already waste-adjusted recommendation, so extra material is not applied twice.
Board-foot purchasing commonly uses actual measured or rough dimensions. Nominal labels and surfaced sizes vary, so this calculator does not automatically convert 2×4 or similar names.
Rough hardwood thickness may be described in quarters: 4/4 is 1 inch, 5/4 is 1.25 inches, 6/4 is 1.5 inches, and 8/4 is 2 inches before any surfacing. Enter the corresponding measured decimal thickness.
A board foot is volume, a linear foot is length, and a square foot is area. Square footage alone omits thickness; board feet equals square feet times thickness in inches.
The editable project allowance is applied once after all row totals. Optional cost is material only and excludes tax, delivery, milling, surfacing, shipping, and labor.
A lumber volume of 144 cubic inches, equal to one-twelfth cubic foot.
For inch thickness and width with foot length, multiply all three and divide by 12.
Exactly 144 cubic inches.
Exactly 12.
Each board volume is multiplied by its positive whole-number quantity, then rows are summed.
No. Board foot is volume; linear foot is length.
No. Square foot is area and does not include thickness.
Use actual dimensions unless you intentionally want an estimate based on nominal measurements.
It commonly denotes rough one-inch thickness before surfacing.
Recommended board feet after extra material is multiplied by price per board foot.
Cuts, defects, grain selection, and project needs vary; choose the editable allowance appropriate to the work.
Yes. Thickness, width, and length can use supported metric and US units independently.