bags of concreteĬoncrete Sonotube, Column Or Round Footing:įollowing are the formulas to calculate how much concrete you will require for a circle, tube or column shaped pour: 3.14 x r (inches) x r (inches) x H (inches) ÷ 1728 = cubic feet of concrete (CF) Number of bags of concrete needed: CF ÷ 0.45 = number of 60 lb. bags Number of cubic yards of concrete needed: CF ÷ 27 = cubic yards r = radius of the circle in feet (1/2 of the diameter) T = Thickness in inches CF = Cubic feet of concrete Example:Ī circle 6″ thick where the circle has a radius of 5.5' (11' diameter circle)ģ.14 x 5.5 x 5.5 x 6 ÷ 12 = 47.5 cubic feet of concreteĤ7.5 ÷ 0.45 = 106 (105.6) 60 lb bags of concreteĤ7.5 ÷ 0.6 = 80 (79.2) 80 lb. bags of concreteįollowing are the formulas to calculate how much concrete you will require for a circular slab: 3.14 x r (feet) x r (feet) x T (inches) ÷ 12 = cubic feet of concrete (CF) Number of bags of concrete needed: CF ÷ 0.45 = number of 60 lb. bags Number of cubic yards of concrete needed: CF ÷ 27 = cubic yards L = Length in feet W = Width in feet T = Thickness in inches CF = Cubic feet of concrete Example:ġ0 x 8 x 6 ÷ 12 = 40 cubic feet of concreteĤ0 ÷ 0.6 = 67 (66.7) 80 lb. If you have concrete delivered it is sold by the yard (which is a cubic yard = 27 cubic feet).įollowing are the formulas to calculate how much concrete you will require for a square or rectangular shaped pour: L (feet) x W (feet) x T (inches) ÷ 12 = cubic feet of concrete (CF) Number of bags of concrete needed: CF ÷ 0.45 = number of 60 lb.bag provides 0.6 cubic feet of cured concrete. bag provides 0.45 cubic feet of cured concrete. Pre-mix concrete comes in bags that are 60 lbs.Concrete is a mixture of cement, aggregate, sand and water. It should be noted that cement, is one of the 4 items that makes up concrete. pre-mixed bags - concrete calculator - (you must have Microsoft Excel or other compatible spreadsheet program) To Download Your Free Concrete Calculator - right click - save as Square or Rectangle Concrete Slab Circular Concrete Slab Concrete (Sonotube) or Columnĭownload a free automatic ready-mix, by the yard and quantities required of 60 lb. All that is required is some knowledge and the right tools. Building your own concrete slab, patio driveway or walkway is an excellent home improvement and most diy home handymen are capable of completing this type of project.
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