The area of that slab is (60 x 20) = 1,200 square feet = 1331/3 square yards.
But that doesn't tell you how much concrete you'll need in order to pour it.
What you really want to know is the cubic yards of volume required. That's
what the concrete guys are talking about when thery say "yards" of concrete.
1 cubic yard = 27 cubic feet
Volume = (length) x (width) x (height) = (60 x 20 x 1/2) = 600 cubic feet = 222/9 cubic yards.
( 22.22222... )
81
A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
How many square yards in a 20x18 feet 3 inches thick
about 26.4 is the volume i think.......
6 inches is 1/6 of a yard, so a cubic yard of concrete will cover 6 sq yards = 54 sq ft
About 162sf.
81
A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
2.15
14.81 yds
go to any search. and type in concrete calculater
1000 square feet/9 = 111.1 square yards of concrete 6 inches thick. This is the same as 111.1/4.5 = 24.7 cubic yards of concrete.
How many square yards in a 20x18 feet 3 inches thick
39.1116 cubic yards
6
It is all dependant on how thick the concrete is. You take the square footage and turn that into cubed feet (where the thickness comes in) if its 1" thick you multiply the square footage by.083, if its 2" thick you multiply by.17. To come up with this number you take the thickness say 3" and divide that by 12 (12 inches in a foot), so for 3 inches you get .25. So back to the question at hand, say your 30 square feet of concrete is 6 inches thick, your equation would look like this: 30 X .5 = 15. So 15 is your cubed footage. You then multiply this number by 150 which is the weight in pounds of 1 cubic foot of concrete. The number you come up with is 2,250. That is the amount in pounds of your 30 square feet of concrete assuming it is 6 inches thick.
1 cubic yard covers 324 square feet per inch of thickness, divide 324 by thickness in inches to get coverage, i.e. 4 inches thick would cover 324/4=81 square feet, 36 inches thick would cover (you guessed it) 9 square feet.