How this calculator works
One bar is exactly 100,000 Pa. One psi is one pound-force per square inch, with the pound, standard gravity and international inch fixing its definition. Its factor is exactly 0.45359237 x 9.80665 / 0.0254^2 Pa, approximately 6,894.757293168 Pa. The displayed conversion uses this factor to floating-point precision.
Formula
psi = bar x 100000 / 6894.757293168; bar = psi x 6894.757293168 / 100000.
Worked example
2.5 bar is approximately 36.2594344326 psi. A reading of 100 psi is approximately 6.8947572932 bar.
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Frequently asked questions
Is psi the same as psig?
Psi names the unit; psig states that the reference is ambient pressure. A unit conversion alone preserves the reference.
Do I subtract 14.7 when converting bar to psi?
Only when you also change from absolute pressure to gauge pressure near standard atmosphere. The bar to psig converter handles that separate step.
Can I convert a pressure difference?
Yes. Select the appropriate units and use the magnitude of the difference. This page accepts non-negative magnitudes.