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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How many 8"X8"X16" concrete hollow block from 50 kg cement
10 bags will give you 6'2/3", seven bags will give you 11 bags will give you 7'1/3". Each bag is 2/3 cu feet.
0.42cub.m (Cement sand mortar)
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
To determine how many bags of concrete you need to fill a five-gallon bucket, first calculate the volume of the bucket. A five-gallon bucket holds about 0.67 cubic feet. If you're using a standard 60-pound bag of concrete, which typically yields about 0.45 cubic feet, you would need approximately 1.5 bags to fill the bucket. Always check the specific yield of the concrete mix you are using for the most accurate calculation.