A square slab measuring 8 ft by 8 ft by 4 inches will require a minimum of 0.8 cubic yards.
10 yards
6.67 Cubic Yards
39.1116 cubic yards
15 cubic yards
It should be a little over 19 yards.
10 yards
6.67 Cubic Yards
How many square yards in a 20x18 feet 3 inches thick
39.1116 cubic yards
15 cubic yards
15 cubic yards
8.25 cubic yards of concrete
Depends on how thick it is. At 4 inches thick, you would nee about 5.5 cubic yards adjusting for safety. At 6 inches, you'd need about 8 cubic yards. You can play with different thicknesses with the linked concrete pad calculator.
151/9 cubic yards for every 12 inches thick
It should be a little over 19 yards.
7.1
1.62