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PSI to Bar

Pounds per square inch to bar, for tires and tools.

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PSI to bar

Convert psi to bar for tires, compressors and gauges

1 pound per square inch = 0.06894757293 bars

Formula: bar = psi × 0.06894757293168

Pounds per square inch to bars table

Pounds per square inch (psi)Bars (bar)
10.06894757293
20.1378951459
30.2068427188
40.2757902917
50.3447378647
60.4136854376
70.4826330105
80.5515805835
90.6205281564
100.6894757293
151.034213594
201.378951459
251.723689323
503.447378647
1006.894757293

Calculated on your device with exact factors from NIST and the SI.

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How to convert PSI to bar

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PSI to Bar: what to know

Psi (pounds per square inch) is the US customary pressure unit for tires, air compressors and plumbing. The bar is a metric unit equal to exactly 100,000 pascals (SI Brochure), close to the air pressure at sea level. NIST SP 811 defines 1 psi as one pound-force per square inch, which works out to exactly 6894.757293168 Pa, so bar = psi × 0.06894757293168.

Worked examples: a car tire at 35 psi is 2.413 bar; a road bike tire at 90 psi is 6.205 bar; a compressor set to 120 psi is 8.274 bar; a 9-bar espresso extraction is 130.5 psi. In everyday use, 14.5 psi per bar is a good mental figure.

Most gauges read gauge pressure, the pressure above the surrounding air, sometimes written psig or barg. Absolute pressure (psia, bara) adds one atmosphere, about 14.7 psi or 1.013 bar. The conversion factor is the same for both, but don't mix a gauge value with an absolute one.

Popular uses

  • Converting car, bike and motorcycle tire pressures
  • Setting air compressors and pneumatic tools
  • Reading espresso machine and pump specs
  • Converting hydraulic and plumbing pressures

Tips for the best result

  • Quick estimate: divide psi by 14.5.
  • Check tire pressure cold; readings rise as tires warm up.
  • For weather pressure, use hPa or mbar in the full converter.
  • Inflate to the pressure on the door placard, not the maximum printed on the tire sidewall.

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