Tools Tools and Calculators Conversion CalculatorThe conversion calculator will convert virtually any unit of measurement into the unit of measurement that you need. Simply fill out one of the fields and the rest of the fields will auto populate with the corresponding conversion. Board Foot CalculatorEnter in the thickness, width, and length of your board or slab and the calculator will tell you how many board feet it is. You can then add a cost per board foot to generate a total price, or enter the total price to generate the cost per board foot.