Bar to PSI Conversion Calculator

Convert bar to PSI or PSI to bar for automotive, engineering, HVAC, pneumatic, and industrial pressure measurements.

Convert bar and PSI

Enter a pressure and select the source and destination units.

Pressure value

From unit

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About bar to PSI conversion

Bar and pounds per square inch, usually written PSI, are common pressure units from different measurement traditions. One bar is defined as exactly 100,000 pascals. PSI describes one pound-force acting on one square inch and is tied to the international avoirdupois pound and inch. The resulting conversion is approximately 1 bar equals 14.503773773 PSI. This relationship is widely needed when equipment, gauges, manuals, and specifications use different units. To convert bar to PSI, multiply the bar value by 14.503773773. To convert PSI to bar, divide by the same factor. For example, 2 bar is approximately 29.007548 PSI, while 30 PSI is approximately 2.068427 bar. The calculator supports both directions so users can compare European or metric-oriented pressure specifications with values commonly used in the United States. Automotive tire pressures are a familiar application. A recommendation near 2.2 bar corresponds to about 31.91 PSI. Compressors, pneumatic tools, HVAC equipment, hydraulic components, and industrial vessels also display pressure ratings in one or both units. Accurate conversion helps prevent mistakes when matching components or following operating instructions, but the converted number should never replace the manufacturer's safety limits. Pressure readings can be absolute or gauge values. Gauge pressure is referenced to ambient atmospheric pressure, whereas absolute pressure is referenced to a vacuum. Converting between bar and PSI does not change this reference. A value stated as bar gauge remains gauge pressure after conversion, and the same principle applies to absolute measurements. Confirm the reference whenever it affects a calculation or safety decision. This tool uses a precise factor derived through pascals and rounds the displayed answer to six decimal places. That is more detail than most everyday gauges can measure. Report only the significant figures justified by the original reading. For tire inflation, industrial controls, refrigeration, or other safety-sensitive work, use a calibrated instrument, account for temperature where required, and follow the relevant equipment documentation and professional standards.

Bar and PSI examples

Common pressure values converted in both directions.

Input	Output	Context
1 bar	14.503774 PSI	The base conversion factor
2.2 bar	31.908302 PSI	A typical passenger tire pressure
30 PSI	2.068427 bar	A familiar tire-pressure value
100 PSI	6.894757 bar	An industrial pressure comparison

How to convert bar and PSI

Enter the non-negative pressure value.
Choose whether the input is measured in bar or PSI.
Choose the unit required for the result.
Select Convert pressure and read the equivalent value.

Bar to PSI FAQ

How many PSI are in one bar?

One bar equals approximately 14.503773773 PSI. Most practical readings can use fewer decimal places based on instrument precision.

How do I convert PSI back to bar?

Divide the PSI value by 14.503773773. For example, 30 PSI converts to approximately 2.068427 bar.

Which unit is used for tire pressure?

Both bar and PSI are common for tire pressure, depending on the country and vehicle documentation. Always follow the value and unit printed by the vehicle manufacturer.

Is bar the same as atmospheric pressure?

They are close but not identical. One standard atmosphere equals 1.01325 bar, so one bar is slightly below one atmosphere.

Does temperature affect pressure readings?

Yes, pressure in a closed gas volume generally changes with temperature. The unit conversion remains the same, but the physical pressure can change as conditions change.