Multiply by 0.036 http://www.enercongroup.com/conversion_factors.htm
One PSI is equal to 27.7 inches of water column
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To convert inches of water to psi (pounds per square inch), you can use the conversion factor: 1 inch of water is approximately equal to 0.0361 psi. Therefore, 11 inches of water would be calculated as 11 x 0.0361 psi, which equals approximately 0.3971 psi.
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Inches of water x 0.03613 = psi
Multiply inches of WC by 0.0361 to obtain PSI.
One psi (pounds per square inch) is 27.7 inches of water. An inch of water is a unit of pressure which will raise water one inch. A cubic inch of water weighs 0.0361 pounds, so one psi is one over 0.0361 or 27.7 inches of water.