Zero. "Cubic feet" describes a volume of space, like the space inside a bottle or a box.
"Square feet" describes an amount of surface, like the surface of a sheet of paper or
the floor of a room. The surface of a sheet of paper has no volume, and can't hold any
water, because is has no sides. Square feet have no cubic feet in them.
That's why there are two different kinds of units. If one could convert into the other,
we wouldn't need both of them.
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You cannot equate cubic yards and square feet. A cubic yard per foot (depth) is 27 square feet (an area of 27 sqft x depth 1ft = volume 27 cu ft) = 1 cu yd). So for this question we need to know the depth to work out the volume.
None.
A square foot is a measure of area while a cubic metre is a measure of volume. The two measure different things and it makes no sense to try to convert from one to the other without some additional information.
You could spread 500 cubic metres of a substance over an infinitely large area if the substance could be spread infinitesimally thinly. Or, you could stack 500 cubic metres over a very tiny square area - the stack would be incredibly high. though.
Cubic feet is a measure of volume while square feet is a measure of area. They do not directly convert.
It doesn't make sense to convert between CUBIC measurement and SQUARE measurement.