Fourty cubic feet.
Where are 12 inch concrete blocks applied?
3.16 Cubic Yards
42 cubic feet or 1.56 yards.
At least 28.5 cubic yards for a 6-inch depth.
For a 4-inch depth you will need at least 7 cubic yards.
Depends on the length of the hole.
At 7.48 gallons per cubic foot that is 3.14x30x30/4x52 x7.48 /12 = 22,900 gallons
84 cubic inches!
Where are 12 inch concrete blocks applied?
That depends on how deep (thick) you need it to be. You'll need 1 yard of concrete for every 3/4 inch of thickness of the pad.
How deep do you want the concrete to be?
.02469 cu yd
96 cubic feet of concrete
2000 pounds
54sqare feet
3.16 Cubic Yards
42 cubic feet or 1.56 yards.