How square feet in one yard of concrete?

Answer 1

It is impossible to answer the question as asked because square feet is a measure of area and a "yard of concrete" actually refers to a cubic yard of concrete.

However, if we make a couple assumptions we can answer the question I THINK you're asking which is, "How many square feet of concrete does one cubic yard of concrete yield if poured to a typical depth of 4 inches?"

The inches of depth can be changed to suit the situation, but in any case giving the poured concrete a depth turns it into a volume which makes it easier to compute the area a cubic yard of concrete will cover.

To begin, we need to convertt the square footage of concrete (which is an area) to a volume. Let's use 6 inches for the depth:

12" x 12" x 6" = 864in^3 or 864 cubic inches

This is the number of cubic inches of concrete in one square foot of concrete poured to a depth of 6 inches.

Now we put a cubic yard into the same terms, cubic inches:

36" x 36" x 36" = 46,656 in^3 or 46,656 cubic inches of concrete.

Now we simply divide number of cubic inches of concrete in a yard of concrete by the number of cubic inches in a square foot of concrete poured to a depth of 6 inches:

46656 / 864 = 54 square feet.

By the way, there are 27 cubic feet in a cubic yard and you may notice that 27 x 2 = 54. That's a result of the depth I chose for the poured concrete--6 inches. A square foot of concrete poured to a depth of 6 inches is equal to one half cubic foot of concrete.

27 / .5 = 54

If you want to figure square foot yield per yard when you pour the slab at 4 inches instead of 6 inches, then simply substitute 4" in the equations for 6".

(36" x 36" x 36") / (12" x 12" x 4") = 81 square feet.