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Ready mixed concrete is ordered in terms of "cubic yards."  The below calculations will assist you in figuring how many "cubic yards" of concrete is required for your project.
**Important Note**
You must first convert all measurements to be stated in terms of "feet."
Ex:  (4" = .33'), (5" = .42'), (6" = .5'), (7" = .59'), (8" = .67'), (9" = .75'), (10" = .84')

Slab "Flatwork" (Cubic Yards ):  Driveway, floor, sidewalk, patio, etc.
Length' x Width' x Depth' 
Example:  A sidewalk that is 4 feet wide, 30 feet long, and 4 inches thick:
4 x 30 x .34 
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)
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.

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Please call us at 573.635.4101 for help in figuring the concrete required for your project.