Enter the height and diameter of the column

Click on the Calculate button. 

The calculator will display the number of cubic yards required.

Enter the width, length, and thickness of your job, 

Select the thickness in feet or inches

Click on either Base Rock, Drain Rock, or a custom density selection
The Base Rock and Drain Rock selections will fill in the density of the rock for you; the Custom selection allows you to enter a rock density in the Density field.

Click on the Calculate button

Enter the width, length, and thickness of your paving job

Click on the Calculate button

The calculator will estimate the number of tons of hot mix that will be required. This estimate is based on a density for the mix of 150 lbs per cubic foot. Please note that densities will vary somewhat between different mixes, but this value is a standard "rule of thumb" for estimating.