Bar to PSI Converter (bar to psi)

Cars built for Europe and Asia print their recommended tire pressures in bar, often beside kPa, on the door pillar or fuel flap; espresso machines advertise pump pressure in bar, and dive cylinders are stamped with their working pressure in bar. Drivers and divers who learned on psi gauges need the figures the other way round. The bar is a round metric unit, exactly 100,000 pascals, slightly less than one standard atmosphere of 1.01325 bar.

Because 1 bar is so close to normal air pressure, a gauge reading in bar is roughly the number of extra atmospheres pushing outward: a tire at 2.3 bar holds a little over two atmospheres more than the air around it. Multiplying by 14.5038 gives the same reading in psi.

How to use this tool

1. Type a value in the Bar box to see it in pounds per square inch, or type in the Pound per Square Inch 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

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

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

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

Example

Two conversions worked with the same factors the converter uses:

2.3 bar × 14.503773773 ≈ 33.3587 psi

35 psi × 0.0689475729317 ≈ 2.41317 bar

Bar to Pound per Square Inch chart

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

Pound per Square Inch to Bar chart

The reverse direction for values people often look up.

Pressures quoted in bar

Quick mental estimate

Multiply by 15, then take away a thirtieth of the result: 2.2 bar → 33 − 1.1 = 31.9 psi. That is the same as multiplying by 14.5, only about 0.03% under the exact factor and closer than any tire gauge can read.

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

The two units

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.

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.