PSI to Bar Converter

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PSI to Bar Conversion Guide

Converting between PSI (pounds per square inch) and Bar is commonly needed in pneumatics, hydraulics, and many engineering applications. This page provides an easy converter with detailed explanations and reference values.

PSI to Bar Conversion Formula

To convert from PSI to Bar:

1 PSI = 0.0689475729 Bar
Bar = PSI × 0.0689475729

This conversion is based on the definition that 1 Bar equals 100,000 Pascal and 1 PSI equals 6,894.76 Pascal.

Common PSI to Bar Conversions

  • 1 PSI = 0.0689476 Bar
  • 5 PSI = 0.344738 Bar
  • 10 PSI = 0.689476 Bar
  • 15 PSI = 1.03421 Bar
  • 20 PSI = 1.37895 Bar
  • 30 PSI = 2.06843 Bar
  • 50 PSI = 3.44738 Bar
  • 100 PSI = 6.89476 Bar

Understanding PSI and Bar Pressure Units

PSI (pound-force per square inch) is a unit of pressure commonly used in the United States and the UK, especially in automotive, manufacturing, and engineering contexts. Bar is a metric unit approximately equal to atmospheric pressure at sea level and is widely used in Europe and many other countries.

PSI (Pound per Square Inch)

  • Defined as one pound-force per square inch
  • Equals exactly 6,894.76 pascals
  • Commonly used for tire pressure in the US
  • Used in hydraulic and pneumatic systems
  • Standard in the oil and gas industry

Bar

  • Defined as 100,000 pascals (exactly)
  • Very close to atmospheric pressure (1.01325 bar)
  • Commonly used for tire pressure in Europe
  • Standard in many meteorological applications
  • Widely used in industrial pressure gauges

Real-World Applications

Tire Pressure

Car tire pressure is typically:

  • 30-35 PSI (2.07-2.41 Bar) for passenger cars
  • 35-45 PSI (2.41-3.10 Bar) for light trucks
  • 80-100 PSI (5.52-6.89 Bar) for heavy trucks

Other Pressure References

  • Atmospheric pressure at sea level: 14.7 PSI (1.01325 Bar)
  • Standard bicycle tire: 40-60 PSI (2.76-4.14 Bar)
  • Home water pressure: 40-80 PSI (2.76-5.52 Bar)
  • Espresso machine: 8-10 Bar (116-145 PSI)