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The easiest way is use Rule 324

(Length in Feet X Width in Feet x Height in Inches) Divided by 324

= Cubic Yards of concrete.

Example 4' x 20' x 4"=320 Divided by 324 = 0.9876 Cubic Yards.

Or

Rule 27

(Length in Feet x Width in Feet x Height in Feet) Divided by 27

= Cubic Yards of Concrete.

Example 4' x 20' x 0.33333333'=26.6666664 Divide by 27 = 0.9876 Cubic Yards.

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