One square yard is equal to 9 square feet, because a yard is equal to 3 feet. Given this conversion ratio, 400 square feet would be equal to 44.44 square yards.

I cu yd = 27 cu ft you cannot get square feet from cubic yards as square feet is area and yards volume - you need to know how deep the 400 sq feet is - in other words, volume. For example 400 sq feet that is 1 feet deep is 400 cubic feet; then divide by 27 to get cubic yards

400 square yards. This is because there are 9 square feet in a square yard, and there are 3600 square feet of carpet needed to cover the 60' x 60' floor.