Calculate How Much Sand You Will Need Using The Sand Calculator. You start by finding or building a straight 2x4 that is 1 foot longer than your pool diameter. In our case, we had a 15 ft pool so I attached two 2x4's together to make one long 16 foot 2x4, as shown below.
One cubic foot is made up of 1728 inches so any three figures which when multiplied together make this number will give the dimensions of a one cubic foot box. A cubic foot is one twentyseventh of a cubic yard. A cubic foot is an imperial unit used in the UK and the United States to measure volume and is used for measuring oil and gas.