Square inches measure area. Yards measure length.
If you mean square inches (of area) per square yard (of area), read on.
First, there are 12 inches to a foot, and 3 feet to a yard. That makes 12 x 3 = 36 inches per yard. then to find square inches in a square yard, you need to square the 36--that is, multiply it by itself. So....
36 x 36 = 1296.
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A yard is a unit of distance. A square inch is a unit of area. The two units are therefore incompatible.
1,296 square inches.
since there are 3 feet per yard and 12 inches per foot, a square yard is 36x36 inches. that means that there are 1296 square inches in a square yard, so 1:1296
1 square yard = 9 square feet.
42 If you are talking about a square yard, 36 inches x 36 inches = 1296 square inches or 9 square feet.