Sakrete is a powder cement mix including sand and gravel that only requires the addition of water for use. Homeowners can mix one bag at a time or several bags in a batch for larger jobs. Sakrete is a high strength mix for applications of over 2-inches in depth. Calculate fill areas by obtaining the total cubic feet of the area and dividing it by the yield per bag of Sakrete.
Multiply the width times the length in feet of the area to fill. For example, a 16'x18' fill space will require you to multiple16 times 8, which equals 128.
Multiply this number by the depth of the concrete project in feet. For example, a 6-inch deep concrete block is 1/2-foot or .50. Multiply 128 times .50 to obtain 64 cubic feet of Sakrete to fill the block.
Divide the cubic feet of the project by the yield per bag of Sakrete. Forty pound bags yield .30 cubic feet each. Divide 64 by .30 to obtain 213.33 bags to fill the area. Round the final number up to the nearest whole number. So, for this example it will take 214 bags of Sakrete to fill a 16 x 8 x 6-inch block.