The formula for concrete calculations is length x width x depth divided by 27. Area of the driveway can be found by multiplying the length in feet by the width in feet. To figure how much concrete to order for a slab on grade you need to know some basic area and volume formulas.
A cubic yard is a 3-dimensional cube that is 3 feet long in each dimension while a cubic meter is a cube that is 1 meter long in each dimension.
Identify the terminology and formulas that are used when calculating area and volume. To determine how many bags of concrete you will need divide the total cubic yards needed by the yield. Convert the inches into feet. If hand mixing its inadvisable to exceed a water to cement ratio of 055 which translates to 55 pounds of water for every 100 pounds of cement.