How do you calculate total bank cubic yards?

One Bank Cubic Yard (BCY) equals 27 cubic feet (3'x3'x3') of earth in situ. When excavated and loaded loosely into a truck, the original one BCY of material expands to approximately 1.25 Cubic Yards (CY). The conversion from BCY to CY is required to estimate the correct quantity and costs of materials to be handled or transported after excavation.