Convert Bar (bar) to Pounds per square inch (psi) (psi)
Category: Pressure
2.5 bar = 36.259434 psi
High-precision rounding: 6 decimals
How to convert bar to pounds per square inch (psi)
We convert by pivoting through the SI base unit for Pressure and applying exact factors where applicable.
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Examples
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Comparing gauge pressure (psig) with absolute pressure (psia/hPa) without converting reference.
- Mixing bar with atm (1 atm = 1.01325 bar).
About Pressure
Pressure is force per unit area. Pascals (and kPa, hPa) are SI, while bar and psi are widely used in engineering and scuba. Conversions must respect absolute vs gauge references when comparing values.
About Bar
Bar
Equals 100,000 Pa (exact). Handy engineering unit near mean sea-level pressure (≈1.01325 bar).
History: Introduced by early 20th-century meteorologists; remains popular in scuba, hydraulics, and weather.
About Pounds per square inch (psi)
Pounds per square inch (psi)
Imperial/US pressure unit. Common for tires, hydraulics, and compressors; often shown with gauge (psig) vs absolute (psia).
History: Industrial adoption in North America entrenched psi as a practical non-SI unit.
Related conversions from bar
- bar → pa Pascal (Pa)
- bar → atm Standard atmosphere (atm)
- bar → torr Torr
Related conversions to psi
- pa → psi Pascal (Pa)
- atm → psi Standard atmosphere (atm)
- torr → psi Torr