800lbs
10-ft x 30-ft x 4-in = 100 cubic ft.That slab weighs 3.7 times as much as 1 "yard" of concrete. (rounded)
11.852 cubic yards
12 ft x 10 ft x .333 ft (4 in) = 39.96 cu ft. You need enough concrete for 40 cubic ft.
assume 4" thick. 4"x48"x192"/(36"x36"x36") = 0.79 yards 36" in a yard
800lbs
10-ft x 30-ft x 4-in = 100 cubic ft.That slab weighs 3.7 times as much as 1 "yard" of concrete. (rounded)
about 5 yards if your slab is 4" deep
7.1
1.5 cubic yards of cement are needed for an 11' x 11' x 4" slab.
22 cubic yards
15 cubic yards
15 cubic yards
11.852 cubic yards
20
Assuming you need a slab 25 feet x 32 feet x 4" you would need 10 yards of concrete. 25 x 32 x .33 / 27 = 9.7 cubic yards
Volume = 11.85 Cubic Yards.