calculate cubic yard
1 Calculate your volume; Multiply area times the depth, this will be volume in cubic feet. 2  Calculate your cubic yards; Divide cubic feet by 27 to convert to cubic yards and this is your answer. 3  Where (ft 2) = square foot, (ft 3) = cubic foot, (yd 3) = cubic yard. Calculate your area (see below). 2  Calculate your volume; Multiply area times the depth, this will be volume in cubic feet. 3  Calculate your cubic yards; Divide cubic feet by 27 to convert to cubic yards and this is your answer.