This formula is applicable for any square or rectangular area commonly referred to as a slab when pouring concrete. Pre-Mix Concrete Bag Calculator Calculated at 1333 lb per ft³ - Allow extra for waste Cubic Feet - 100 Bags 80 Bags 75 Bags 60 Bags 50 Bags 40 Bags 25 Bags 20 Bags 10 Bags. You get 13 cu.
This formula provides an approximation of how much concrete is needed in a designated area.
100 x 33 33 cubic feet. Multiply the length 10 ft by the width 10 ft by the depth 35 ft or 4 in and divide it by 27 the number of cubic feet in a cubic yard. 517 pounds of cement or 234kg 1560 pounds of sand or 707kg 1600 pounds of stone or 725kg. Some things to keep in mind.