0.6 Cubic Yards
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
To calculate the weight of a concrete slab measuring 4 feet by 4 feet with a thickness of 4 inches, first convert the thickness to feet: 4 inches is 1/3 feet. The volume is then 4 ft x 4 ft x (1/3 ft) = 16/3 cubic feet. Concrete typically weighs about 150 pounds per cubic foot, so the weight of the slab is approximately 16/3 ft³ x 150 lbs/ft³ = 800 lbs.
To determine how many bags of concrete are needed for a slab measuring feet x feet x 4 inches, first convert the dimensions to cubic feet. A 4-inch thickness is equivalent to 0.33 feet, so the volume is calculated as length x width x 0.33. Then, divide the total cubic feet by the volume of a standard bag of concrete (usually 0.5 cubic feet). This will give you the number of bags required.
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
To determine how many bags of concrete you need for a 10 x 10 slab, first calculate the volume: a 4-inch thick slab is 10 x 10 x (4/12) = 33.3 cubic feet. A typical 80-pound bag of concrete covers about 0.6 cubic feet. Dividing 33.3 by 0.6 means you would need approximately 56 bags of concrete for that size slab.
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