Pounds per Square Inch to Bars Converter

To convert a measurement in pounds per square inch to bars, multiply the value by 0.068947572932. The conversion factor comes from the relationship between both units and the pascal.

For example, to convert 5 psi to bars: 5 × 0.068947572932 = 0.344737864658 bar.

Pounds per square inch (psi) is an imperial unit of pressure equal to the force of one pound-force applied to an area of one square inch, or about 6,894.76 pascals. Rooted in the imperial system, psi remains the dominant pressure unit in the United States. It appears on tire gauges, air compressors, and hydraulic equipment throughout North America.

Common uses of pounds per square inch include: Tire pressure in the United States; Air compressors and pneumatic tools; Hydraulic system ratings; Plumbing and water pressure specifications.

A bar is a metric unit of pressure equal to exactly 100,000 pascals, roughly equal to atmospheric pressure at sea level. Introduced by Norwegian meteorologist Vilhelm Bjerknes, the bar takes its name from the Greek 'baros' (weight). Although not an SI unit, it remains popular in industry, diving, and weather because it is close to one atmosphere.

Common uses of bars include: Scuba diving depth and tank pressure; Industrial hydraulics and pneumatics; European tire and automotive pressure; Weather systems (via millibars).

Anyone servicing vehicles or equipment across regions runs into this constantly. US tire gauges read in psi while European specifications use bar, so a mechanic checking a 32 psi tire needs to know it equals about 2.2 bar. Espresso enthusiasts also convert here, since machine pumps are often rated in psi but brewing pressure is quoted in bar.

Here are some common values converted:

1 psi = 0.068947572932 bar 5 psi = 0.344737864658 bar 10 psi = 0.689475729317 bar 50 psi = 3.447379 bar 100 psi = 6.894757 bar