PSI to Bar Converter (psi to bar)

A tire gauge bought in the US, an air compressor's regulator and a scuba pressure gauge all read in pounds per square inch, while European car placards, bike pumps sold in Europe and most dive centers outside North America work in bar. One psi is a pound-force spread over a square inch, about 6,894.76 pascals, and one bar is exactly 100,000 pascals, so the conversion is a single fixed factor.

Both units normally describe gauge pressure, the amount above the surrounding air, so a tire at 32 psi shows roughly 2.2 bar on a European gauge with nothing added or subtracted. Only a reading marked psia (absolute) includes the atmosphere, and it should be compared with an absolute figure in bar.

How to use this tool

1. Type a value in the Pound per Square Inch box to see it in bars, or type in the Bar box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Pressure converter.

Formula

Bar (bar) = Pound per Square Inch (psi) × 0.0689475729317

Pound per Square Inch (psi) = Bar (bar) × 14.503773773

Both factors come from exact definitions: 1 bar = 14.503773773 pounds per square inch and 1 pound per square inch = 0.0689475729317 bars (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

32 psi × 0.0689475729317 ≈ 2.20632 bar

2.4 bar × 14.503773773 ≈ 34.8091 psi

Pound per Square Inch to Bar chart

Common values from pounds per square inch to bars, rounded to four decimal places.

Bar to Pound per Square Inch chart

The reverse direction for values people often look up.

Pressures set in psi

Quick mental estimate

Multiply by 7, then divide by 100: 32 psi → 2.24 bar. The factor 0.07 is about 1.5% above the exact 0.0689476, so the shortcut always comes out slightly high; at tire pressures that is less than 0.05 bar.

Use the converter or the charts when the exact figure matters.

The two units

Pound per Square Inch (psi): One pound-force per square inch (psi) is about 6,894.76 pascals. A factor conversion is valid when both readings have the same reference; changing absolute pressure to gauge pressure (psig) also requires subtracting the reference pressure.

Bar (bar): The bar is a metric pressure unit defined as exactly 100,000 pascals. These conversions preserve the pressure reference: changing between absolute pressure and gauge pressure also requires the surrounding reference pressure.