Concrete Calculator

Concrete is ordered by volume, so a pour starts with the dimensions of the shape you are filling. The slab option takes length and width in feet with thickness in inches, and the column option takes a diameter in inches with a height in feet and a count. Both add a waste allowance and return cubic yards, cubic feet, cubic metres and the number of 60 and 80 pound bags. Bag counts are rounded up, and ready-mix suppliers usually have a minimum order of their own.