1. Know that the formula for calculating concrete consists of the following: (length x width x height)/27) x 1.05 = Total concrete needed plus 5 percent extra. The length, width and
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lenth x width x thickness in feet divided by 27 cubic feet
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I am assuming you are trying to calculate the amount of concrete needed. You take the volume of the form  multiply length times width times depth, in feet, subtract the volume of
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Try this site. http://www.1800concrete.com/concretecalc… Good Luck
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