PSI to Bar
Convert any value from psi to bar with full precision. Use the converter above for instant results, or read on for the exact formula, worked examples, common uses, and answers to frequently asked questions.
📊 Quick Conversion Table
About the PSI to Bar conversion
Pressure conversions are used in physics, engineering, medicine, meteorology, and many industrial processes. The SI unit is the pascal, but bar, psi (pounds per square inch), atmospheres, torr, and mmHg are common in their respective fields.
This page focuses specifically on converting psi to bar. Use the converter above for instant results, or read on for the exact formula, a worked example, and answers to common questions.
Where this conversion is used
Tire pressure is measured in psi in the US and in bar or kPa in Europe. Atmospheric pressure is reported in millibars (hectopascals) by meteorologists and in inches of mercury by US weather reports. Medical blood pressure is measured in mmHg. Scuba divers use bar to track tank pressure.
If you frequently convert psi to bar, bookmark this page — the exact URL gives you instant access without searching, and the conversion widget is ready to use the moment the page loads.
Conversion formula
The exact mathematical relationship between psi and bar is:
1 psi = 0.06894757 bar
So to convert a value V from psi to bar, use:
Vbar = Vpsi × 0.06894757
To go in the opposite direction:
Vpsi = Vbar × 14.50377377
These factors come from the international definitions published by NIST, BIPM, and ISO 80000 and are exact within their respective standard systems. The converter applies them with full floating-point precision.
Worked example
Using the formula above, here are some common values converted from PSI to Bar:
| PSI | Bar |
|---|---|
| 1 | 0.068948 |
| 5 | 0.344738 |
| 10 | 0.689476 |
| 25 | 1.723689 |
| 50 | 3.447379 |
| 100 | 6.894757 |
Sources and accuracy
The pascal equals one newton per square meter (BIPM, NIST). Standard atmospheric pressure equals exactly 101,325 Pa. One bar equals exactly 100,000 Pa. One psi equals exactly 6,894.757293168 Pa. One torr equals exactly 101,325 / 760 Pa.
This page was reviewed against multiple authoritative references. Conversion factors are cross-checked with the NIST SP 811 guide, the BIPM SI brochure, ISO 80000, and where applicable, the historical references for older unit systems. If you spot an inconsistency or have a suggested improvement, please let us know via the contact page.
Important disclaimer: for mission-critical work — medical dosing, legal-for-trade measurements, aerospace, large-scale engineering, and financial calculations — always verify independently with the original source. This converter is intended for everyday conversions, education, and quick reference.
Practical tips
When reading weather reports, "millibars" and "hectopascals" are the same unit (1 mbar = 1 hPa = 100 Pa). Standard sea-level pressure is 1013.25 mbar or hPa.
If you are converting large lists of values, use the swap button to instantly reverse direction without retyping. For decimal-heavy values you can paste them directly into the From field — the input accepts standard decimal notation, including negative values and scientific notation (for example, 1.23e-5).
Frequently asked questions
How accurate is this psi to bar converter?
It uses the official international conversion factors from NIST and BIPM with full double-precision floating-point accuracy. For everyday use the result is precise to many more decimal places than any practical measurement requires.
Can I convert in both directions?
Yes. Use the ⇄ button above to swap the From and To fields. You can also change either dropdown to any unit in the pressure category.
Do I need an internet connection?
Only for the first page load. Once the converter is loaded it runs entirely in your browser, so it works offline as well.
Is my data private?
Yes. The conversion calculation happens locally in your browser. The values you enter are never sent to any server.