How Much Pea Gravel Do I Need For A Patio. For 15 cubic yards of gravel get about one-half cubic yards of sand. Standard gravel crushed stone river rock and decomposed granite are other popular choices.
The depth of the gravel must also come into play. Before you lay the pea gravel you will need to cover the surface of the patio with landscape fabric. To determine if you need a base material you will need to consider your soil consistency.
Divide by 27 to get the number of cubic yards of pea gravel needed.
Standard gravel crushed stone river rock and decomposed granite are other popular choices. If the area to be covered is a square or rectangle you easily can calculate the amount of pea gravel needed by hand. For a 120-square foot patio that works out to 40-cubic feet of gravel. If the soil is clay and very firm then the soil will be a fine base.
