Example: A sidewalk that is 4 feet wide, 30 feet long, and 4 inches
thick:

__4 x 30 x .34 __

27

In this case,
the equation tells you that 1.52 cubic yards will be required. As a rule of thumb, always round up to the nearest quarter
yard to compensate for differentials in depth, measurements, and/or "waste/spillage."

__Footing:__
Same as above, just use the measurements required.

__Wall:__ Same as above...just imagine
the wall as a "vertical slab!" (Your "depth" will now be the "thickness" of the
wall.)

__Hole / Circular Area:__

Reminder....you must
use the magic "pi"....3.14 in this case,

and you must convert the diameter to a radius
by dividing the diameter by 2, then "square" that radius figure.

Example: A hole
"pier" that is 1 ft in diameter and 3 ft deep.

__.5 x .5(radius squared) x 3.14
("pi") x 3 (depth)__

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In this example, the hole would
require .09 cubic yards....therefore, if you had 10 holes this size you would need 10 x .09 = .90 cubic yards

Rounding
up, it would be wise to order __1.25 cubic yards__ in this case.