The answer will depend on what it is that you wish to convert into PSI.
You cannot. Inches are a linear measure, PSI (pounds per square inch) is a measure of pressure. The units are incompatible.
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Multiply the 8 oz by 28.3 to convert to grams. Multiply the sq yd by 1.19599 to convert to sq m
5 pounds per sq yard
6mm plywood weighs 8.406 pounds per sq m or 3.82 Kgs per sq m
Pounds per square foot x 0.006944 equals psi
convert 1224 sq feet to sq meters