Q: How much concrete do you need for a walkway 4feet by 12 feet 4 inches thick?

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81

55

one (1) cubic yard of concrete four inches thick will cover 80 sq. feet. 85 yards x 81 = 6885 sq. feet.

How many square yards in a 20x18 feet 3 inches thick

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.

Related questions

No, it only comes 48 inches wide.

Concrete driveways are no less than 3.5 inches to 4.5 inches.

4 To 6 inches

90 sq yds at 4" thick.

About 162sf.

should be at lest 4 inches

55

81

10 yards

7.1

If it is 4 inches deep/thick, 2 cubic yards. If it is 6 inches deep/thick, 3 cubic yards.

go to any search. and type in concrete calculater