Determine the number of yards (or cubic yards) of loam necessary to cover the space. Divide the example’s 40 cubic feet of loam you need by 27 cubic feet per cubic yard. You’ll need to order 1.48, or about 1 1/2 yards of loam to cover the space at the 4-inch depth you plan...
How much is a ton of gravel? A ton of gravel with average-sized pebbles is about 0.705 cubic yards, or 19 cubic feet, assuming it has been screened for debris and contains no leftover dirt, sand, etc. How much is a tonne of gravel?
This gives you the area of the space in square feet. You can also use this formula to calculate smaller areas when the area will be expressed in square inches and larger areas in square yards. As an example, suppose you want to know how much flooring you might need to renovate a room...