Bar to PSI Conversion Calculator — Bar to Pounds per Square Inch
Convert any pressure in bar to psi (pounds per square inch) and other common pressure units instantly. The exact factor is 1 bar = 100,000 Pa ÷ 6894.757 Pa/psi ≈ 14.5038 psi.
bar
1 bar = 14.5038 psi (absolute, measured from vacuum)
- 1
Bar to pascals
1 × 100,000 = 100,000 - 2
Pascals to psi
100,000 ÷ 6,894.757 = 14.50381 psi = 6,894.757 Pa (from the exact pound-force and inch definitions).
How does this calculator work?
1 bar = 14.5038 psi (absolute), because 1 bar = 100,000 Pa and 1 psi = 6894.757 Pa. For gauge pressure (psi above atmospheric), the same factor applies: bar gauge × 14.5038 = psig. Related: 1 bar = 0.9869 atm = 100 kPa = 750 mmHg.
Formula
How this is calculated
The bar is a metric pressure unit equal to exactly 100,000 pascals (Pa), while the psi (pound-force per square inch) is defined through the pound-force and the inch: 1 psi = 1 lbf/in² = 4.448222 N / (0.0254 m)² = 6894.757 Pa. Dividing these two definitions gives the exact conversion factor: 1 bar = 100,000 / 6894.757 ≈ 14.503773 psi.
Both values are absolute pressures — measured from a perfect vacuum. In everyday life, psi is often quoted as gauge pressure (psig), which is the absolute pressure minus local atmospheric pressure (≈ 14.696 psi at sea level). A car tyre inflated to 32 psig has an absolute pressure of about 32 + 14.696 = 46.696 psia ≈ 3.22 bar. This calculator produces absolute psi (psia); for gauge psi see the Bar to PSIG calculator.
The conversion covers the full linear range: 0 bar = 0 psi (vacuum), negative bar values give negative psi (sub-atmospheric absolute), and the result scales exactly with the input. No approximation or correction is involved — the factor 100,000/6894.757 is exact by definition.
Frequently asked questions
1 bar = 14.5038 psi (absolute). More precisely: 1 bar = 100,000 / 6894.757293 = 14.503773772954 psi.
Tyre pressures are quoted in gauge pressure — above atmospheric. A tyre at 2.1 bar gauge = 2.1 × 14.5038 ≈ 30.5 psig. To convert: psig = bar(gauge) × 14.5038. The atmospheric reference cancels in gauge-to-gauge conversion, so you can directly multiply bar gauge by 14.5038 to get psi gauge.
Neither is inherently more accurate — accuracy depends on the instrument, not the unit. The SI unit for pressure is the pascal (Pa) or its multiples (kPa, MPa). Bar and psi are both derived from exact definitions, and conversions between them are exact to the precision of the pound and inch definitions.
TG we-Calculate Editorial Team. (2026). Bar to PSI Conversion Calculator — Bar to Pounds per Square Inch [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/bar-to-psi-conversion-calculator
TG we-Calculate Editorial Team. "Bar to PSI Conversion Calculator — Bar to Pounds per Square Inch." TG we-Calculate. 2026. https://we-calculate.com/calculator/bar-to-psi-conversion-calculator.
TG we-Calculate Editorial Team, "Bar to PSI Conversion Calculator — Bar to Pounds per Square Inch," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/bar-to-psi-conversion-calculator
@misc{wecalculate_bar_to_psi_conversion_calculator, title = {Bar to PSI Conversion Calculator — Bar to Pounds per Square Inch}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/bar-to-psi-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }
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