Bar to Psi Converter
Convert bar to pounds per square inch easily. Free bar to psi converter for pressure.
Formula
PSI = bar × 14.5038
Common Conversions
How to Convert Bar to PSI
1 bar = 14.504 psi. Multiply bar by 14.504 to get psi. So 2.5 bar × 14.504 = 36.26 psi. Most European/UK tyre and pressure equipment uses bar; US equipment uses psi. The conversion is essential for international car owners or anyone using equipment from another region.
Air conditioning systems: typically 30-50 psi = 2.07-3.45 bar low side, 200-300 psi = 13.79-20.68 bar high side. Espresso machines: 9 bar = 130.5 psi (the standard pressure for proper espresso extraction). Hot water tanks: typically 1.5-3 bar = 22-44 psi safety pressure.
Common Bar to PSI
| Bar | PSI |
|---|---|
| 0.5 bar | 7.25 psi |
| 1 bar | 14.50 psi |
| 1.5 bar | 21.76 psi |
| 2 bar | 29.01 psi |
| 2.5 bar | 36.26 psi |
| 3 bar | 43.51 psi |
| 6 bar | 87.02 psi |
| 10 bar | 145.04 psi |
Frequently Asked Questions
Why does espresso use 9 bar?
9 bar (130 psi) is the pressure traditionally needed to force water through tightly-packed coffee grounds for proper extraction. Modern machines deliver 9 bar at the group head despite pumps producing higher pressures (15+ bar). Some specialty equipment uses lower 6-7 bar for distinctive extraction styles.
What does '3 bar' on a watch mean?
Watch water resistance rating in bar (often labelled '30 m', '100 m', etc.). 3 bar = approximately 30 metres = 'splash resistant' but not for swimming. 10 bar = 100 metres = swimming/snorkelling. 20 bar = scuba diving. The depth ratings are approximate; actual safe depth is usually less than the rating suggests.
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