Converting Pounds Per Square Inch or PSI to Millibars

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 cancelled 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 mbar

Answer:

The average sea level air pressure is 1006.6 mbar.