You can't convert cubic units to square units, or the other way around either.
They're used to measure different kinds of quantities.
Square units might tell you how much carpet it takes to cover the floor and walls
of a room. Cubic units might tell you how much air or jello it takes to fill the room.
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This is not a valid conversion. Cubic units is a measure of volume while square units is a measure of area. Generally, volume is determined by multiplying length x width x depth. Area is normally determined by multiplying length x width.
It cannot be done. A square metre is a measure of area, with dimensions [L2] while a cubic metre is a measure of volume, with dimensions [L3]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
By using the linear length of the meter to measure in three orthogonal directions and multiplying the measurements together to get the volume of the three dimensional object in cubic meters.