How Do I Convert 2600 Square Feet 6 Inches Deep Into Yards?

I want to calculate:
How many cubic yard of concrete need to make a cement floor,9 feet x 12 feet and 6 inches thick?

54000 square inches convert to square yard

If your question is pertaining to cubic yards, then the answer is 48 cubic yards. 1 cubic yard of concrete will cover 54 square feet of surface at a depth of 6 inches. 2600 square feet divided by 54 gives you 48 cubic yards.

I have footing 8 inch wide by 12 tall by 40ft long how many yards of cement do I need