Multiply it.
13 feet x 12 feet is 156 square feet
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That depends what units your 12 and 13 are. If that's 12 feet by 13 feet, then you would simply multiply 12 times 13 to get 156 square feet.
156 square feet
You cannot convert '18 x 13' to square feet, because you have NOT hiven the units of '18' nor '13' .
13 times 12 = 156. So 156 square feet
12 feet X 13 feet = 156 square feet 156 / 9 = 17.333 square yards