3 x 3 x 1 1/2 is how may square feet

Question

filling a garden bed with dirt.  How much do we need to buy if bed is 3 x 3 x 1 1/2?

Answer 1

If you mean 3 ft * 3 ft * 1.5 ft = 13.5 ft^3, that is an infinite number of square feet because ft^3 is in 3 dimensions and ft^2 is in 2 dimensions (volume vs area).

If you mean how many cubic feet of dirt do you need for the garden, that should be 13.5 ft^3, 13.5/27 = 0.5 yd^3