Essentially you are solving for volume and then converting to cubic yards. For concrete, the formula for volume is as follows: length x width x thickness.
How to Calculate Cement?
In order to calculate the amount of cement you will need for your project, you must first determine the volume of the space that will be filled by the cement.
To do this, you need to know the dimensions of the space. Once you have the dimensions of the space, you can calculate the volume by multiplying the length times the width times the depth.
For example, let‘s say you are filling a rectangular space that is 3 feet long, 2 feet wide, and 6 inches deep. The volume of this space would be 3 x 2 x 0.5, which equals 4.5 cubic feet.
Now that you know the volume of the space, you can calculate the amount of cement you need. One cubic foot of cement will fill approximately 0.625 cubic feet of space.
Therefore, you will need 4.5 / 0.625, which equals 7.2 cubic feet of cement. To convert this to bags of cement, you need to know that one cubic foot of cement will weigh approximately 94 pounds.
Therefore, you will need 7.2 x 94, which equals 673.6 pounds of cement. This is the equivalent of approximately 34 bags of cement.