Linear Feet is probably the simplest quantity to calculate. Lumber yards
sometimes sell lumber by the linear foot which makes it easy to calculate
the cost per piece.
Linear feet = number of items X the item length

Board Feet
will add two other dimensions to calculating the cost of
materials. Lumber suppliers sometimes sell their lumber per thousand
board feet. A board foot is one linear foot of lumber - one foot wide -
one inch thick. A 1 x 12 piece of pine which is 12 feet long will equal 12
board/feet. In the same way a 2 x 6 piece of pine 12 feet long will equal
12 board/feet.
Board feet = Linear feet X ((thickness inches X width inches) / 12
inches)

Square Feet
is a simple process of multiplying the length X the width.
You will need to know how many square feet there is in the foundation in
order to estimate how much vapor barrier to buy and to determine how
much the termite pre-treat will cost.
Square Feet = Length X Width

Cubic Feet
adds one other dimension to square feet. This dimension is
depth.
Cubic Feet = Length X Width X depth
Cubic Yard
is used to determine how yards of concrete or fill dirt might
be needed for the job. There are 27 cubic feet in a cubic yard of fill dirt
and concrete.
Cubic Yard = Total Cubic Feet / 27 cubic feet
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