Convert square feet to square yards (sq ft to sq yd)

One square foot is exactly a ninth of a square yard, because a yard is three feet and area squares the factor. It needs no definition beyond the yard's.

Worked through: 144 sq ft x 0.111111111 = 16 sq yd.

Going the other way, one square yard is 9 square feet.

For mental arithmetic: Divide by 9, or divide by 10 and add 11%.

Carpet is sold by the square yard and rooms are measured in square feet, so sq ft to sq yds is the conversion a carpet quote turns on, but the floor area is not what gets ordered. Broadloom carpet comes off a roll of fixed width, most commonly 12 feet, so a room is bought as a strip 12 feet wide and as long as the room, and the seams and the direction of the pile decide how many strips. A 10-by-14-foot room is 140 square feet, or 15.6 square yards, and the order is a 12-by-14 piece (18.7 square yards) before anything is allowed for waste. The conversion here is right; it is only part of the quote.

Precision is worth matching to the input. A measurement given as 9 sq ft carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.