PSI to BAR Converter

There are 0.0689475729 bar in 1 psi (pound per square inch). This conversion factor is based on the international standard for pressure units.

For practical purposes, this is often rounded to 0.0689 bar per psi, though our converter uses the full precision of 0.0689475729 for accurate results.

The key differences between psi and bar relate to their measurement systems and typical applications:

• PSI (Pounds per Square Inch): An imperial unit measuring the force in pounds applied to one square inch of area. Primarily used in the United States and countries using imperial measurements.
• BAR: A metric unit defined as 100,000 Pascals (the SI unit of pressure). Widely used in Europe, Asia, and other metric system countries.

Both measure pressure, but they belong to different measurement systems. 1 bar is approximately equal to atmospheric pressure at sea level, which is about 14.7 psi.

To convert psi to bar manually, follow these steps:

1. Use the conversion factor: 1 psi = 0.0689475729 bar
2. Multiply the number of psi by 0.0689475729
3. The result is the equivalent pressure in bar
4. Round to your desired number of decimal places

Example: Convert 50 psi to bar
50 psi × 0.0689475729 = 3.447378645 bar
Rounded to 2 decimal places: 3.45 bar

Tire pressure is specified in both units primarily due to regional measurement system differences:

• PSI is standard in the United States and other countries using imperial units
• BAR is standard in most European and Asian countries using metric units
• Many vehicles and tire manufacturers provide both measurements to accommodate international markets
• Some pressure gauges feature dual scales (psi/bar) for convenience

Maintaining proper tire pressure is crucial for safety, fuel efficiency, and tire longevity, regardless of the unit used.

These units are all measures of pressure but belong to different measurement systems:

• Pascal (Pa): The SI unit of pressure, defined as one newton per square meter
• Bar: A metric unit equal to 100,000 Pascals (100 kPa)
• PSI: An imperial unit equal to one pound-force per square inch, approximately 6894.76 Pascals

Conversion factors:

• 1 bar = 100,000 Pa = 14.5038 psi
• 1 psi = 6,894.76 Pa = 0.0689476 bar
• 1 MPa (megapascal) = 10 bar = 145.038 psi