How To Calculate How Much Concrete Do I Need For My Project?Calculating the amount of concrete you want for your project can be a very confusing project. Premix cement comes in 60 lb. and 80 lb. Bags. A 60 lb. bag of cement supplies 0.45 cubic foot of cured concrete and an 80 lb. bag of cement provides 0.6 cubic feet of cured concrete. If you want mixed concrete delivered, it is sold by the yard (which a cubic yard = 27 cubic feet). Square or Rectangle Slab Following are the formulas to calculate how many cement bags you will require for a square or rectangular shaped pour: Length x Width x Thickness divided by 12 = cubic feet of concrete (CF)
Number of bags of cement needed
Number of cubic feet of concrete needed L = Length in feet W = Width in feet T = Thickness in inches CF = Cubic feet of concrete
Example Circular Slab Following are the formulas to calculate the concrete you will need for a circular slab: 3.14 x r x r x T divided by 12 = cubic feet of cement (CF)
Number of bags of cement needed
Number of cubic yards of concrete needed to fill circle
r = radius of the circle in feet (1/2 of the diameter)
Example
A circle 6" thick where the circle has a radius of 5.5' (11' diameter circle) Tube or Column Following are the formulas to calculate how much concrete you will need for a circle, tube or column shaped pour: 3.14 x r x r x H divided by 1728 = cubic feet of cement (CF)
Number of bags of concrete needed
Number of cubic yards of concrete needed
r = radius of the circle in inches (1/2 of the diameter)
Example 
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