You have a bit of confusion going on here. AREA is measured in square feet; VOLUME is measured in cubic feet.
We'd need to know the length to multiply times the height to determine the area (sq ft); multiply that sum times the depth (or thickness) to determine the volume (cu ft).
As The Z said, you are looking for volume.
I figured someone somewhere has made some tentative and realistic calculations. Here is a quote and a link:
Rhuzkan's estimate was that a 30-foot wall would use more than three times the total concrete in the Hoover Dam. With this extra 20 feet of concrete, we’re up to at least four Hoovers.
(You can look up Hoover Dam)
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