Bar to PSI
Convert bar to psi instantly. Free, fast, no signup.
How to use this tool
- Enter bar in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your psi and the full breakdown beneath it.
Convert bar to psi instantly. Free, fast, no signup.
Formula
PSI = Bar × 14.5038
1 bar = 100,000 Pa. 1 psi = 6,894.757 Pa. Therefore: 1 bar ÷ 6,894.757 Pa/psi × 100,000 Pa/bar ≈ 14.5038 psi.
How it works
To convert bar to PSI, multiply the pressure in bar by 14.5038. Bar is defined as exactly 100,000 pascals; dividing by the pascal equivalent of one PSI (6,894.757 Pa) gives the 14.5038 factor. This conversion is frequently used when working with European equipment specifications that report pressure in bar while US systems expect PSI.
Common mistake: Using the rough approximation of 15 psi per bar instead of 14.5038, which introduces a 3.4% error — significant in precision engineering or medical pressure contexts.
Worked example
Convert 1 bar to PSI
- Start with the input: 1 bar.
- Apply the conversion factor: 1 × 14.503773773 = 14.503773773.
- Round to four decimal places: 14.5038 PSI.
1 bar = 14.5038 PSI
Common mistakes to avoid
- Confusing bar with millibar (mbar): 1 bar = 1,000 mbar, so entering mbar gives results 1,000x too large.
- Forgetting the gauge vs. absolute distinction: tire pressure in bar is gauge, so 2.5 bar gauge = 2.5 bar above atmospheric.
- Using 14.5 instead of 14.5038, which compounds over multiple conversions in engineering calculations.
Key terms
- Bar
- A metric unit of pressure equal to exactly 100,000 pascals. Standard atmospheric pressure at sea level is approximately 1.01325 bar.
- PSI (Pounds per Square Inch)
- A pressure unit used in the US and UK, defined as one pound-force applied over one square inch. Standard atmospheric pressure is approximately 14.696 psi.
- Pascal (Pa)
- The SI unit of pressure. 1 Pa = 1 N/m². Both bar and psi can be expressed in pascals, making pascal the common bridge unit for pressure conversions.
- Atmospheric Pressure
- The standard pressure of Earth's atmosphere at sea level, defined as 101,325 Pa, which equals approximately 14.696 psi or 1.01325 bar.
Frequently asked questions
- How do I convert bar to psi?
- Multiply the number of bar by 14.5038 to get psi.