1 60lbs bag makes around a 1' by 1' by 3" thick pad..
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9.72 Cubic Yards of Concrete is required, if you are going to order by cement truck. 874.8 bags of 40# (40 lbs) bags, or 583.2 bags of 60# 437.4 bags of 80#
7 cement bags per 1 cubic meter of concrete......
It works out to about 13.1 bags for every inch deepyou're planning on.
According to Blue Circle it takes 108 bags of concrete to get a cubic meter
1350/depth of the concrete in feet