Converting Pounds Per Square Inch or PSI to Millibars
Worked Pressure Unit Conversion Problem
PSI and millibar are two common pressure units.
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by

Anne Marie Helmenstine, Ph.D.

Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.

Updated March 06, 2017

This example problem demonstrates how to convert the pressure unit pounds per square inch (psi) to millibars (mb).Problem: The average air pressure at sea level is 14.6 psi. What is this pressure in mbar?Solution: 1 psi = 68.947 mbar Set up the conversion so the desired unit will be canceled out. In this case, we want mbar to be the remaining unit. pressure in mbar = (pressure in psi) x (68.947 mbar/1 psi) pressure in mbar = (14.6 x 68.947) mbar pressure in mbar = 1006.6 mbarAnswer: The average sea level air pressure is 1006.6 mbar.