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It depends on the thickness of the application.Concrete bags you buy at the home center are generally labeled with the (in this case fraction of a) cubic yard of concrete it makes - it depends on the weight of the bag (60# or 80#) . The bag manufacturers have calculators on their sites to help you figure out how much you need based on area (and thickness) of the job.

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Q: How many square feet are in a bag of concrete?
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