Home & DIY Calculators
Lumber Board Feet Calculator
Enter thickness, width, length, and quantity for each board size to calculate total board feet and cost.
| Thickness (in) | Width (in) | Length (ft) | Qty | Board ft | |
|---|---|---|---|---|---|
| 40.00 |
40.00 board feet
≈ $180.00 at $4.50/board foot
Board feet = (thickness in × width in × length ft) ÷ 12, the standard lumber measurement formula. Actual dressed (surfaced) lumber is often slightly smaller than its nominal size — check your supplier's actual dimensions if pricing matters.
How to use this tool
- 1Enter thickness, width, and length for a board size.
- 2Enter the quantity of that size.
- 3Add more board sizes if needed.
- 4See total board feet and estimated cost.
Frequently asked questions
What's the board feet formula?+
Board feet = (thickness in inches × width in inches × length in feet) ÷ 12 — the standard lumber industry measurement.