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.
20
8 square yards
You'll need 1.23 Cubic Yards.
Depends on how thick the slab is, but 4" thick (.33 or 1/3 of a foot thick) would be typical. So multiply 10 x 10 = 100 square feet of area times .33(thickness in feet) equals 33 cubic feet. A 90 lb. bag contains about .66(two thirds) of a cubic foot of concrete, so you would need about 1 1/2 bags per cubic foot or 50 bags for 10'x10'x4"
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
20
8 square yards
You'll need 1.23 Cubic Yards.
10
The number of bags of concrete needed for setting fence posts depends on the size and number of posts. Typically, one 50-pound bag of concrete is enough for one 4x4 fence post. So, if you have 10 fence posts, you would need 10 bags of concrete.
3 cu.yds
Depends on how thick the slab is, but 4" thick (.33 or 1/3 of a foot thick) would be typical. So multiply 10 x 10 = 100 square feet of area times .33(thickness in feet) equals 33 cubic feet. A 90 lb. bag contains about .66(two thirds) of a cubic foot of concrete, so you would need about 1 1/2 bags per cubic foot or 50 bags for 10'x10'x4"
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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
A 10-foot round slab at 4 inches requires 1 cubic yard.
A two-inch slab is fundamentally unsound because it's not thick enough. So...go with at least a three inch slab. For a 16-foot x 14-foot x 3-inch slab: The slab is 224 square feet. Divide by four and you get 56 cubic feet. Add 10 percent (because the bottom isn't flat) and you come up with 61.6 cubic feet. There are 0.6 cubic feet in an 80-pound bag, so you need 103 bags. Do not do it this way. It will cost you more money and the pour will be weak and look terrible. You need 2-1/2 yards of concrete from a concrete company. If you make the slab 4 inches thick, you will need 3 yards and that's better because concrete companies don't like to deal in half-yard increments.
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)