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4.938 cubic yards.

Q: How many yards of concrete to pour a 20 ft by 20 ft slab 4inches thick?

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4.074 cubic yards for every foot the slab is thick.

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

16 * 20 = 320 sq ft. at 4" thick concrete will cover 80 sq ft. 320 / 80 = 4 yards.

1.62

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

Related questions

996 square feet X 1/3 foot = 332 cubic feet.332 cft / 27 = 12.3 cubic yards

You will need 17.8 cubic yards of concrete.

10.67 Cubic Yards

532.4074 yards of concrete, round up to 533 yards.

6.94 Cubic Yards

3.6 cubic yards will be enough.

10 yards

6.67 Cubic Yards

4.074 cubic yards for every foot the slab is thick.

15 cubic yards

15 cubic yards

At 4" thick you will need 1.23 cubic yards.