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10 80# bags will fill about 6 cubic feet, so 375 bags should fill 225 cubic feet (30 x 30 x 0.25).

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At least in my area, it would be much cheaper ordering this to be delivered by a concrete truck.

An 80 lb. bag of concrete is 2/3 of a cubic ft. of concrete. 3 bags is 2 cu. ft. So for 225 cu.ft. youll need 338 bags of concrete.

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Q: How many bags of concrete will you need for 30 ft 30ft 3in thick?
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