Unit converter

PSI to bar.

Convert psi to bar and bar to psi. Type in either box and the other follows. Tyre placards use bar in most of Europe and psi in the UK and the US. 32 psi is 2.21 bar.

From

psi → barExact definition

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Display precision

Pounds per square inch to bars — common values, to 6 significant figures.
psi	bar
10 psi	0.689476 bar
15 psi	1.03421 bar
20 psi	1.37895 bar
25 psi	1.72369 bar
28 psi	1.93053 bar
30 psi	2.06843 bar
32 psi	2.20632 bar
34 psi	2.34422 bar
36 psi	2.48211 bar
40 psi	2.7579 bar
45 psi	3.10264 bar
50 psi	3.44738 bar

1 psi = 0.06894757293 bar

1 bar = 14.50377377 psi

Conversion goes through Pa in both directions, so neither figure is rounded on the way.

Definitions

The pound per square inch is exactly 6894.757 293 Pa. UK and US tyre gauges are still marked in it.
The bar is exactly 100 000 Pa, near enough to atmospheric pressure at sea level to be a convenient working unit.
This conversion is exact by definition. 1 psi = 0.06894757293 bar.
Pressure is converted through Pa.

How it works

One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.

The value passes through Pa, the unit every other pressure unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general pressure converter always agree.

Display precision sets a maximum number of significant figures and trims trailing zeroes, so it changes what you see and never what was calculated. The editable box always holds a plain number at full working precision, so you can carry on from either side.

Common questions this answers: how many bars in a pound per square inch (0.0689476), how many pounds per square inch in a bar (14.5038), and what 32 psi is in bars (2.20632 bar).

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