You need to multiply by 0.036. So 5 x 0.036=.18 psi
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Multiply inches of WC by 0.0361 to obtain PSI.
Multiply by 0.036 http://www.enercongroup.com/conversion_factors.htm One PSI is equal to 27.7 inches of water column
.4 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.
Inches of water x 0.03613 = psi