Psi to Bar

Welcome to psi to bar. Here we show you how to change the pressure from the unit pound per square inch to the unit bar. If you have been looking for psi in bar, or if you have been wondering how many psi in a bar, then you have come to the right site, too. Read on to learn everything about the pressure conversion, and make sure to check out our converter.

A pound per square inch (psi) is the pressure resulting from the force of a pound applied to the area of a square inch. In contrast, a bar is defined as exactly 100000 Pascal (Pa). Because one PA is equal to 1.450377/10000 psi, 1 psi = 1/14.50377 bar, approximately 0.0689476 bar. Whereas the Pascal is a (derived) SI unit, the bar, despite being a metric unit, is not part of the (SI) International System of Units.

Psi is the usual abbreviation for the avoirdupois unit pound-force per square inch, strictly speaking, the unit pound-force per square inch. Psi can also be written in the short forms lbf/sq in, lbf/in2, lbf/in2 and lbf/sq in. That essentially means that lbf/sq in to bar, lbf/in2 to bar, lbf/in2 to bar and lbf/sq in to bar stands for psi to bar.

In the next section you can learn how to convert the units. You are advised to also check out what pounds per square inch absolute means. You can find this and other psi in bar variations further down on this page.

Convert Psi to Bar

From the explanations above follows that the psi to bar formula is [bar] = [psi] / 14.50377.

Thus, to convert the pressure divide the psi by 14.50377. For example, to change 15 psi to bar divide 15 by 14.50377 to obtain ~ 1.03421 bar, the pressure in newton per square meter.

Our frequent conversions include, for instance:

The pound-force per square inch is an avoirdupois unit. Some sources say the avoirdupois system was invented in France, whereas others believe it originated in Florence, Italy.

What is clear though, is, that it was the Brit William Napier Shaw who invented the bar in 1909.

In terms of math, the conversion psi bar is a simple division. However, using a calculator like the one below is way easier than applying the psi bar conversion formula manually.


Our psi to bar converter changes the pressure while you type. For fractions use a decimal point. If you like, you can toggle between the pressure units bar and mbar by pressing the blue button.

Change Psi to Bar


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Click here to find out all about converting bar to psi. Observe that you can also find frequent pressure conversions using our search form in the side bar. Enter, for instance, x psi in bar.

By reading on you can find out what psia to bar stands for. And much more, such as the unit psi converted to the multiples and sub-multiples of bar.

Additional Information

You have already learned a lot about the psi to bar conversion, but now it’s upon us to explain you the difference between pounds per square inch gauge (psig), also known as pounds per square inch gage, and pounds per square inch absolute (psia).

Psia indicates vacuum conditions. To calculate the psia use this formula: psia = psig + local pressure. Psig, in turn, indicates that the pressure is relative to atmospheric conditions: psig = psia – local pressure.

Throughout our website we use 14.7 psi or 1.01325 bar to approximate the local pressure (standard sea level pressure).

For example, at 0 meter above sea level, an inflated air mattress gauged 0.1 psi has a pressure of 0.1 + 14.7 = 14.8 psia.

  • If you want to convert psig to barg you can forget about the extra 14.7 psi when reading the pressure gauge in psi, also known as psig or psi(g).
  • If you want to convert psia to bara you can forget about the extra 14.7 psi if you have a value in in psi absolute, also known as psia or psi(a).
  • If you calculate the difference between pressures in either psig or psia, don’t take local pressure into account as long as you don’t mix absolute and relative units.
  • If you convert a pressure from psi to bar, you don’t have to think about local pressure as long if you don’t mix relative and absolute units.

If a gauge pressure is relative to something else than ambient atmospheric pressure conditions, then the unit would be called psid, the short form of pounds per square inch differential.

Right below we show you the frequent pressure conversions in this context. For disambiguation, psi means psi absolute, aka psia or psi(a), and bar means bar absolute, except when stated differently:

Psia to Bar

The psia to bar conversion is as follows: psia to bar = psi / 14.5037. That is, to convert psia to bar we have to divide the bar value by 14.7.

You can use our calculator to change psia to bar.

Psig to Bar

The psig to bar conversion can be made with this equation: psig to bar = (psig / 14.50377) + 1.01325. “Psig” is only used to distinguish psi from psia.

To convert psig to bar use our formula.

Psig to Barg

Because barg or bar(g) means gauge or gage pressure, and as psig denotes a gauge pressure, too, the formula is psig to barg = psig / 14.50377.

You can make use of our tool to convert psig to barg.

Psia to Barg

Because bar(g) or barg stands for gauge/cage pressure, yet psia stands for a vacuum pressure, the formula is psia to barg = (psia / 14.50377) – 1.01325, provided 0 meter above sea level.

To convert psia to barg use our formula.

Psi to Barg

When talking about psi to barg, it either means psig to barg or psia to barg, probably the former. To convert psi to barg find out whether you are dealing with psia or psig.

Using the search form on our sidebar, you can also look for conversions like psia to bar. Try it out now, but remember to also check out psi to millibar a little bit further down on this post.

Psig to Psia

The psig to psia conversion is as follows: psig to psia = psig + 14.7. That is, to convert psig to psia we add 14.7 to the psig value. This is sometimes referred to as psi to psia.

Psig to Psi

In order to convert psig to psi we are going to assume that psi stands for pounds per square inch absolute, so we have the psig to psia situation just discussed above.

Psia to Psig

The psia to psig conversion is as follows: psia to psig = psig – 14.7. Therefore, to convert psia to psig we have to deduct 14.7 from the the psia value.

Psi to Psig

Regarding the conversion psi to psig we assume that psi means pounds per square inch absolute, so we have psia to psig case, discussed right above.

Next, we will explain how convert psi to the multiples and submultiples of bar.

Psi to mBar

It is quite common to come across metric prefixed units of bar such as the millibar, a thousandth of bar. The conversions of psi to these derived units of pressure include:

Psi to megabar: the psi to Mbar formula is Mbar = psi / (14.50377 x 106)
Psi to kilobar: the psi to kbar formula is kbar = psi / (14.50377 x 103)
Psi to hectobar: the psi to hbar formula is hbar = psi / (14.50377 x 102)
Psi to decabar: the psi to dabar formula is dabar = psi / (14.50377 x 10)
Psi to decibar: the psi to dbar formula is dbar = (psi x 101) / 14.50377
Psi to centibar: the psi to dbar formula is dbar = (psi x 102) / 14.50377
Psi to millibar: the psi in mbar formula is mbar = (psi x 103) / 14.50377
Psi to microbar: the psi to μbar formula is μbar = (psi x 106) / 14.50377

To convert psi to bar use the formulas above. Make sure to understand the difference between Mbar and mbar. The most important submultiple of the unit bar is probably the mbar (millibar).

To convert psi to mbar divide the pressure in psi by 14.50377, then multiply the result by 1000. For example 2 psi to millibar = (2 / 14.50377) x 1000 ~ 137.895 mbar.


Reading so far you have reached the concluding section of our article.

The following depiction sums the conversion up:

Psi to Bar

For further information regarding the units mentioned in this article check the reference section at the bottom of our home page.

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