# ››Convert millibar to pound/square inch

 mbar PSI

The above form works if you are measuring differential pressure, such as the difference in psi between two points. It also gives the correct answer for absolute pressure, assuming you are measuring psia, which is the pressure relative to absolute zero vacuum.

If you are measuring relative to vacuum and want to resolve the pressure relative to the atmosphere, then you should use the form below.

mbar (relative to vacuum)
PSI (relative to atmosphere)

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 0.000145037738007 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!

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

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# ››Definition: Millibar

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)

# ››Definition: Pound/square inch

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.

# ››Metric conversions and more

ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!