How many mbar in 1 PSI?
The answer is 68.9475728.

We assume you are converting between **millibar** and **pound/square inch**.

You can view more details on each measurement unit:

mbar or
PSI

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 0.01 mbar, or 0.00014503773800722 PSI.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between millibars and pounds/square inch.

Type in your own numbers in the form to convert the units!

You can do the reverse unit conversion from PSI to mbar, or enter any two units below:

A millibar (mb) is 1/1000th of a bar, a unit for measurement of pressure. It is not an SI unit of measure, however it is one of the units used in meteorology when describing atmospheric pressure. The SI unit is the pascal (Pa), with 1 millibar = 100 pascals (a hectopascal)

The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/inē or lbf/inē) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.

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