Bar to PSI Converter

How to convert bar to pounds per square inch

1 bar = 14.50377377 pounds per square inch. To convert bar to pounds per square inch, multiply by 14.50377377. A bar is exactly 100,000 pascals, close to one atmosphere (1.01325 bar). One psi is one pound-force on one square inch, exactly 6,894.757293168 Pa.

Worked examples

• 2.5 bar = 36.2594 psi (2.5 × 14.503774)
• 9 bar = 130.534 psi (9 × 14.503774)
• 200 bar = 2,900.75 psi (200 × 14.503774)

Where this conversion comes up

Bar are used for tire pressure in Europe, scuba tanks, espresso machines and weather; pounds per square inch for tire pressure, compressors and plumbing in the US. One bar is 14.504 psi. Car tires run at 2.2–2.5 bar (32–36 psi), espresso machines at 9 bar (131 psi) and a full scuba tank at 200 bar (2,900 psi).

Quick estimate

Multiply by 14.5.

Common mistakes

• Dividing instead of multiplying. A pound per square inch is smaller than a bar, so the number of pounds per square inch must come out larger: 2.5 bar = 36.2594 psi.
• Rounding too early. Keep the full factor until the last step; rounding 14.5 to 15 first puts large values noticeably off.

Going the other way? Use the psi to bar converter. Related pressure converters: kpa to psi, psi to kpa, mpa to psi, psi to mpa.