Lumber planning
Board Feet Calculation
Calculate each lumber size separately, multiply by its quantity, then add every row for one board-feet total.
A board feet calculation is most useful when an order contains more than one size of lumber. Instead of averaging dimensions, calculate the volume of each matching group and total the results. That gives you a clearer basis for comparing a lumberyard quote or estimating material cost.
Calculate multiple lumber sizes now with unit selectors, quantities, a running total, and an optional price per board foot.
Calculate an order in rows
For each row, use: thickness (in) × width (in) × length (ft) ÷ 12 × quantity. Add the board feet from every row together.
Example order:
- Six 1 in × 6 in × 8 ft boards: 1 × 6 × 8 ÷ 12 × 6 = 24 board feet.
- Three 2 in × 8 in × 10 ft boards: 2 × 8 × 10 ÷ 12 × 3 = 40 board feet.
- Total order: 24 + 40 = 64 board feet.
If the price is $5 per board foot, this example order costs 64 × $5 = $320 before delivery, taxes, waste, or any seller-specific fees.
Keep sizes separate
Do not combine thicknesses, widths, or lengths before calculating. A 1×6 board and a 2×8 board have different volumes, so they need separate rows. Quantity belongs at the end of each row, after the volume for one board is known.
Plan for the dimensions you are buying
Use nominal dimensions when the seller quotes lumber by nominal size. Use actual dimensions when the material is sold or specified by its measured size. Check the product description before comparing board-foot totals between sellers, especially for surfaced hardwood and finished boards.
Board feet calculation questions
Can I calculate cost from board feet?
Yes. Multiply the final board-foot total by the price per board foot. The calculator does this automatically when you enter a price.
What if some lumber is measured in metric units?
Enter thickness and width in millimetres and length in metres in the calculator. Each row is converted before its board-foot result is calculated.
Does board feet calculation include waste?
No. The calculation measures the lumber dimensions and quantity you enter. Add extra material separately if your cut plan or project requires an allowance.