Bar to PSI Converter
Convert pressure from bar to PSI accurately using the standard bar-to-PSI conversion formula. Enter a pressure value in bar to calculate its equivalent value in pounds per square inch (PSI).
Bar to PSI Calculator
Enter a pressure value in bar and select the number of decimal places for the result. The calculator uses the standard conversion relationship of 1 bar = 14.5037738 PSI.
Bar to PSI Conversion Result
Step-by-Step Calculation
What Is Bar?
The bar is a metric unit of pressure widely used in engineering, industrial equipment, pressure measurement, automotive applications, and other technical fields.
One bar is equal to 100,000 pascals (Pa). Although bar is not an SI unit, it is commonly used alongside SI units in practical pressure measurement and engineering.
What Is PSI?
PSI stands for pounds per square inch. It is a pressure unit based on force per unit area and is widely used in the United States and in many technical applications internationally.
PSI is commonly encountered in tire pressure, hydraulic systems, pneumatic systems, compressed air equipment, pumps, and industrial pressure specifications.
Bar to PSI Formula
PSI = Bar × 14.5037738
Conversion relationship
1 bar = 14.5037738 PSI
Reverse conversion
Bar = PSI × 0.0689475729
To convert a pressure value from bar to PSI, multiply the pressure in bar by 14.5037738.
How to Convert Bar to PSI
- Write down the pressure value in bar.
- Multiply the value by 14.5037738.
- The result is the equivalent pressure in PSI.
- Round the result to the required number of decimal places.
For example, to convert 2 bar:
PSI = 2 × 14.5037738
PSI = 29.0075476
Therefore, rounded to two decimal places: 2 bar = 29.01 PSI.
Worked Example: 5 Bar to PSI
Suppose the pressure is 5 bar.
Step 1: Start with 5 bar.
Step 2: Apply the conversion factor.
5 × 14.5037738
Step 3: Calculate the result.
72.518869 PSI
Therefore: 5 bar = 72.52 PSI when rounded to two decimal places.
Common Bar to PSI Conversion Table
| Bar | PSI |
|---|---|
| 0.1 bar | 1.4504 PSI |
| 0.5 bar | 7.2519 PSI |
| 1 bar | 14.5038 PSI |
| 2 bar | 29.0075 PSI |
| 3 bar | 43.5113 PSI |
| 4 bar | 58.0151 PSI |
| 5 bar | 72.5189 PSI |
| 6 bar | 87.0226 PSI |
| 7 bar | 101.5264 PSI |
| 8 bar | 116.0302 PSI |
| 10 bar | 145.0377 PSI |
| 20 bar | 290.0755 PSI |
| 50 bar | 725.1887 PSI |
| 100 bar | 1450.3774 PSI |
Bar, PSI and Pascal
Pressure can be expressed using several different units. Bar and PSI are commonly used in practical applications, while the pascal is the SI unit of pressure.
| Pressure | Equivalent |
|---|---|
| 1 bar | 100,000 Pa |
| 1 bar | 14.5037738 PSI |
| 1 PSI | 6,894.757293 Pa approximately |
Bar to PSI for Tire Pressure
Tire pressure is commonly displayed in PSI, bar, or both depending on the vehicle, country, manufacturer, and pressure gauge.
A bar-to-PSI conversion can therefore be useful when comparing a pressure specification with a gauge that displays a different unit.
Bar to PSI in Hydraulic and Pneumatic Systems
Hydraulic and pneumatic equipment may use bar or PSI depending on the equipment manufacturer and applicable engineering documentation. Converting between these units can make specifications easier to compare.
For equipment operation, always use the pressure limits and settings specified by the manufacturer or applicable engineering documentation.
Bar to PSI in Industrial Applications
Pressure conversion is frequently required when working with pumps, compressors, pressure vessels, process equipment, instrumentation, valves, pipelines, and industrial machinery.
Engineering documents may use different pressure units depending on the project, manufacturer, standard, or region. A consistent unit system should be maintained throughout calculations.
Gauge Pressure and Absolute Pressure
A pressure value can be reported relative to atmospheric pressure or relative to a vacuum reference. Gauge pressure is referenced to the surrounding atmospheric pressure, while absolute pressure is referenced to an ideal vacuum.
Converting bar to PSI does not itself change the pressure reference. The unit conversion and pressure-reference conversion are separate concepts.
Rounding and Decimal Places
The underlying conversion uses the factor 14.5037738. The displayed answer can be rounded depending on the required precision.
Exact calculation: PSI = Bar × 14.5037738
For everyday applications, two decimal places are often sufficient. For engineering calculations where greater numerical precision is required, additional decimal places can be displayed.
Common Mistakes When Converting Bar to PSI
- Using the PSI-to-bar conversion factor in the wrong direction.
- Dividing by 14.5037738 instead of multiplying when converting bar to PSI.
- Confusing bar with millibar (mbar).
- Rounding the conversion factor too early.
- Mixing gauge and absolute pressure values.
- Assuming the converted number represents a safe operating pressure.
Why Convert Bar to PSI?
Converting bar to PSI is useful when pressure information is supplied in one unit while equipment, gauges, manuals, specifications, or technical documents use another.
A unit converter removes the need to manually calculate the conversion and helps maintain consistent numerical results when comparing pressure values.
Accuracy and Limitations
The mathematical conversion between bar and PSI is fixed. However, real-world pressure measurements may have measurement uncertainty caused by gauge accuracy, calibration, temperature, installation, sensor characteristics, and other factors.
This calculator performs only the numerical unit conversion. It does not account for measurement uncertainty or determine whether a pressure is appropriate for a particular piece of equipment.
Calculation Methodology
The calculator uses the standard bar-to-PSI conversion relationship. The entered bar value is multiplied by 14.5037738.
PSI = Bar × 14.5037738
The calculator performs the multiplication using the full conversion factor and applies rounding only to the displayed result according to the selected decimal-place setting.
Calculation methodology reviewed: The calculator uses the standard bar-to-PSI relationship and keeps calculation precision separate from display rounding.
The calculator is intended for pressure unit conversion and does not replace applicable engineering standards, manufacturer specifications, or professional judgment.
Frequently Asked Questions
How many PSI is 1 bar?
1 bar is equal to 14.5037738 PSI, commonly rounded to 14.50 PSI.
How many PSI is 2 bar?
2 bar is equal to 29.0075476 PSI, commonly rounded to 29.01 PSI.
How many PSI is 3 bar?
3 bar is equal to 43.5113214 PSI, commonly rounded to 43.51 PSI.
How many PSI is 5 bar?
5 bar is equal to 72.518869 PSI, commonly rounded to 72.52 PSI.
How many PSI is 10 bar?
10 bar is equal to 145.037738 PSI, commonly rounded to 145.04 PSI.
What is the formula for converting bar to PSI?
The formula is PSI = Bar × 14.5037738.
Is bar the same as PSI?
No. Bar and PSI are different pressure units. One bar equals 14.5037738 PSI.
How do I convert PSI back to bar?
To convert PSI to bar, multiply the PSI value by 0.0689475729.
How many PSI is 1.5 bar?
1.5 bar is equal to 21.7556607 PSI, approximately 21.76 PSI.
Does this calculator determine safe pressure?
No. This calculator performs unit conversion only. Safe operating pressure depends on the equipment, application, manufacturer requirements, engineering design, and applicable standards.
Technical References
BIPM — SI Brochure
International reference for the International System of Units and measurement definitions.
NIST Office of Weights and Measures
Reference material covering measurement units, standards, and measurement practice.
NIST — SI Units
Information on SI units and measurement terminology from the National Institute of Standards and Technology.
NIST Reference on Constants, Units and Uncertainty
Reference material covering physical constants, units, and measurement uncertainty.
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Disclaimer
This calculator is provided for general informational and unit conversion purposes. It does not determine whether a pressure is safe, suitable, compliant, or appropriate for a particular application. Always follow applicable manufacturer specifications, engineering documentation, standards, regulations, and professional guidance for critical pressure-related applications.