You can't. Square inch is a measure of area and inch is a measure of length.
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23,000 pounds per square inch equals 16170000kg per square meter.
Inches of water x 0.03613 equals pounds per square inch (psi).
There is no universal formula to calculate area - it depends on the shape in question. 1 square inch = 1 inch * 1 inch = 1/12 foot * 1/12 foot = 1/12 * 1/12 square feet = 1/144 square feet. So to convert an area given in square inches to square feet, divide by 144.
Pounds per square foot x 0.006944 equals psi
1 psi x 0.00689475729 = megapascals.