Approx 21 cu yds.
You will need 0.56 cubic yards of concrete.
You will need 17.8 cubic yards of concrete.
how many yards of concrete will i need to do a 20 x20 x4 slab
1.85 cubic yards.
You will need 1.23 cubic yards.
10 yards
At 4" thick you will need 1.23 cubic yards.
3.56 Cubic Yards
2.96 Cubic Yards
You will need 27.6 cubic yards of cement.
40 yards.
You will need 3.6 cubic yards.