None, since there can be no conversion.
A cubic foot is a measure of volume in 3-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempt at comparisons or conversions between the two are fundamentally flawed.
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226.875
27 cubic yards.will cover 720 square feet @ 1 foot thick
A 2500 square foot area x 4' deep is 10000 cubic feet. So you need 10,000 cubic feet of sand. Dry sand has a density of 80-100 pounds or so per cubic foot, so that's somewhere between 800,000 and a million pounds of sand.
To convert square feet to cubic feet, you need to know the height or depth of the space. If the height is 1 foot, then 400 square feet would equal 400 cubic feet. However, if the height is different, you would need to multiply the square footage by the height in feet to get the cubic footage. For example, if the height is 10 feet, then 400 square feet would equal 4000 cubic feet.
If the 6x12 tiles are in inches, it will take two of them to cover a square foot. You will need 210 of them.