Lumber volume and cost
Board Foot Calculator
Use this board foot calculator to add each lumber size, choose its units, and get one clear total for your order.
How to calculate board feet
If you are asking “how do you calculate board feet”, use the board feet formula below.
Board feet = thickness (in) × width (in) × length (ft) ÷ 12 × quantity. The calculator converts millimetres to inches and metres to feet before applying this formula.
Use nominal dimensions when lumber is priced by nominal size. Use the dimensions supplied by your seller or the actual measured dimensions when that is what your project requires.
You may see this tool called a board footage calculator. The abbreviations bd foot calculator and bd ft calculator refer to the same calculation here.
For readers looking for board feet meaning, the definition below explains the unit.
To estimate how much your lumber weighs, use the lumber weight calculator with dry and green reference weights.
Board feet calculation and abbreviations
A bd feet calculator uses the same volume unit as a bd foot calculator or bd ft calculator. For board feet calculation, enter each size and quantity in the rows above. For board feet meaning, see the definition of one board foot in the questions below.
Board feet calculator FAQ
What is a board foot?
One board foot is a volume of 144 cubic inches: a board 1 inch thick, 12 inches wide, and 12 inches long.
Can I calculate several lumber sizes at once?
Yes. Add a row for every size. The calculator totals the board feet, quantities, and cost across all rows.
Can I use millimetres and metres?
Yes. Thickness and width can be entered in inches or millimetres. Length can be entered in feet or metres.
How is total cost calculated?
Total cost = total board feet × the price per board foot you enter. Leave the price blank if you only need volume.