Each 60 pounds bag of ready mix concrete will make .45 cubic foot of concrete. There are 27 cubic feet in a cubic yard. You will need 60 bags of 60 pound premixed concrete to make 1 cubic yard.
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1 CY = 27 CF. One half yard = 13.5 CF. 13.5 CF /.45 CF per 60 Lb. bag = 30 Bags
According to the related link below; the required amount to cover 1 square yard with 4 inches of concrete is 6.6 60 pounds bags.
Assuming you wish to used bagged 'pre-mixed' concrete, the industry standard is 1/2 cubic foot yield from a 60 pound bag. Keep in mind that the true weight will vary due to such things as sand/portland/aggregate ratios. But for a simple answer, you will be close with 3240 pounds. 60 pounds per 1/2 cubic foot, = 120 pounds for each cubic foot. 27 cubic ft. per yard 120 X 27 = 3240
A cubic foot is 12" thick 12" wide and 12" deep. .45 cubic feet per 60# bag of concrete
105 60 lb bags, youll need xtra for spillage 60lb bag = .45 cub ft 81,648 cub ins in 1 3/4 yrds concrete 1728 cub ins = 1 cub ft 81648 divided by 1728 = 47.25 cub ft 47.25 divided by .45 = 105 60 lb bags