That depends upon how deep the soil bed is and how much moisture is in the topsoil. But here are some ballpark numbers for you: A yard of soil will cover a 10' by 10' area to a depth of three inches. In other words, figure a third of a yard per 100 square feet for every inch of depth. Length x width x # of inches deep divided by 324 = the number of cubic yards needed for that task.
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1 Cubic Yard Spread To A Depth Of 1.5" Will Cover 216 Sq. Ft Or 20 Sq Meters
about 2700 pounds per cubic yard
The weight of a yard (a cubic yard, more accurately) of topsoil varies greatly depending upon its moisture content and how well packed it is. But figure 2000 to 2400 pounds.
55 square yards.
Approximately 6' X 9'.