Concrete is order by the 'cubic yard'.
A cubic yard is a cube 3ft x 3ft x3t.
To determine cubic yards you need to determine the amount of concrete needed by thickness x width x depth.
For example, if you will pour a slab 10 feet wide by 20 feet long by 6 inches deep this will equate to:
10x20 or 200square feet
200x.5 (.5 equals 6" or 1/2 a foot)or 100cubic ft
100 cubic feet divided by 27cubic feet (ie 1 cubic yard or 3x3x3ft=27cuft) equals 3.70cubic yards.
Another way to express this same ratio is to express it as 10feet wide x 20 feet long by .5 feet deep or 10x20x.5 or 100cuft divided by 27=3.70.
A wall 10 feet high x 1 foot thick x 20 feet long would be 10x1x20 or 200cubic feet divided by 27=7.40 cubic yards for the wall...
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