Convert Pounds per square inch (psi) (psi) to Standard atmosphere (atm) (atm)
Category: Pressure
1 psi = 0.068046 atm
High-precision rounding: 6 decimals
How to convert pounds per square inch (psi) to standard atmosphere (atm)
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 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.
About Standard atmosphere (atm)
Standard atmosphere (atm)
Exactly 101,325 Pa. Reference pressure for chemistry and gas laws; useful for normalizing conditions.
History: A conventional unit set for convenience in calculations and comparative tables.
Related conversions from psi
- psi → bar Bar
- psi → pa Pascal (Pa)
- psi → torr Torr
Related conversions to atm
- bar → atm Bar
- pa → atm Pascal (Pa)
- torr → atm Torr