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How many concreate blocks do I need for a 3 sided foundation, 2 sides 24 feet long and 1 side 20 feet, 4 feet high?
blocks are usually 16 inches long (allowing for mortar) and 8 inches high. They can be different widths but thats the standard length and height. You should also check with building code to find out how wide they should be though, depends what type of wall and what height/type of backfill.
It depends on the size of the blocks.