The answer depends on the units used for 16 and 20. It should be blindingly obvious to anybody that 16 ft x 20 ft and 16 cm x 20 cm, for example, will give very different answers.
320 square inches
16x20
320
6 inches on each side. To get square inches of a square you multiply length by width. So, 6 inches by 6 inches = 36 square inches.
One square foot would be 12 inches by 12 inches, or 144 square inches. This means to convert square feet to square inches, multiply the number of square feet by 144 to to get the number of square inches.
320 square inches
2
16x20
3,444.45133 square feet.
16x20
320 square feet. Just multiply length by width - the answer is the square footage.
36,000 square inches.36,000 square inches.36,000 square inches.36,000 square inches.
320
136 square inches.136 square inches.136 square inches.136 square inches.
To convert square inches to square yards, divide square inches by 1,296.
To convert square inches to square mm, multiply square inches by 645.16
To convert square inches to square feet, divide square inches by 144.