Pound per Square Inch to Atmosphere Formula
atm = psi x 0.068046
Conversion factors follow SI relationships published by BIPM and NIST, where those standards apply.
Pound per Square Inch to Atmosphere Converter
Quick Answer
1 psi = 0.068046 atm
Formula: Atmosphere = Pound per Square Inch x 0.068046
Quick values
Worked examples
Convert 1 psi to atm
atm = 1 x 0.068046
Result: 1 psi = 0.068046 atm
Convert 10 psi to atm
atm = 10 x 0.068046
Result: 10 psi = 0.68046 atm
Convert 100 psi to atm
atm = 100 x 0.068046
Result: 100 psi = 6.8046 atm
About Pound per Square Inch and Atmosphere
PSI is pound-force per square inch. The standard atmosphere is 101,325 Pa. Divide PSI by 14.6959 to get atmospheres. 14.696 psi is one atmosphere at the precision used on this page.
Category hub: Pressure Conversion · Conversion charts · Conversion formulas
Pound per Square Inch to Atmosphere Conversion Table
| Pound per Square Inch (psi) | Atmosphere (atm) |
|---|---|
| 1 psi | 0.068046 atm |
| 5 psi | 0.34023 atm |
| 10 psi | 0.68046 atm |
| 14.696 psi | 1 atm |
| 20 psi | 1.36092 atm |
| 30 psi | 2.04138 atm |
| 50 psi | 3.4023 atm |
| 100 psi | 6.8046 atm |
| 150 psi | 10.2069 atm |
Browse all conversion charts → · Browse conversion formulas →
Practical use cases for Pound per Square Inch to Atmosphere
Tire and Vehicle Service
Passenger-car tire placards in the US are often in PSI, while many gauges and shop manuals list kPa or bar. Converting before inflation avoids under- or over-pressurizing a tire.
HVAC and Hydronics
Boiler, chiller, and duct-pressure specs mix PSI, kPa, and inches of water. Field techs convert so setpoints match the equipment nameplate.
Process and Plant Engineering
P&IDs and relief-valve datasheets may use PSI, bar, or kPa depending on the region. Accurate conversion is required before sizing piping and safety devices.
Meteorology and Aviation
Altimeter and station-pressure reports use inHg, hPa, or kPa. Pilots and weather desks convert between those scales for briefings and QNH settings.
Medical and Laboratory Gases
Cylinder pressures and ventilator settings are published in different units by manufacturer and country. Clinicians convert to the unit on the local gauge.
Hydraulics and Pneumatics
Pump and compressor curves are often published in bar or kPa while US shop drawings stay in PSI. Converting keeps actuator force and regulator settings consistent.
Pound per Square Inch to Atmosphere FAQs
Common questions about converting pound per square inch to atmosphere.
How do you convert PSI to atmospheres?
Divide PSI by 14.6959, or multiply by 0.068046. Example: 14.696 psi = 1 atm, 30 psi = 2.041 atm, 100 psi = 6.805 atm.
What is 32 psi in atmospheres?
32 psi ÷ 14.6959 ≈ 2.177 atm. That is a common passenger-tire gauge reading, not an absolute-pressure reading unless the gauge is marked psia.
Why do chemistry problems use 1 atm = 14.7 psi?
Intro problems round 14.6959 to 14.7. Keep the extra digits when you size relief devices, convert cylinder labels, or compare to 101.325 kPa.
Is this the same as converting PSI to bar?
No. 1 atm is 1.01325 bar, so PSI-to-atm and PSI-to-bar differ by that 1.325% offset. Use the bar converters when the nameplate is in bar.
Charts and printable PDF
Use the matching pound per square inch / atmosphere chart when you need a printable table or offline reference.
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