PSI to Atmospheres Converter
Enter the pressure in psi below to convert it to atmospheres.
Convert PSI to Atmospheres
Enter a value in psi (psi) to convert to atmospheres (atm).
Pounds per Square Inch to Standard Atmosphere Conversion Table
Table showing various pounds per square inch measurements converted to atmospheres. Click any preset value or arrow to load it into the converter.
| PSI (psi) | Atmospheres (atm) |
|---|---|
| 1 psi | 0.068046 atm |
| 2 psi | 0.1360919 atm |
| 2.5 psi | 0.1701149 atm |
| 5 psi | 0.3402298 atm |
| 10 psi | 0.6804596 atm |
| 15 psi | 1.0206895 atm |
| 20 psi | 1.3609193 atm |
| 25 psi | 1.7011491 atm |
| 30 psi | 2.0413789 atm |
| 50 psi | 3.4022982 atm |
How to Convert PSI to Atmospheres
To convert psi to atmospheres, multiply the pressure by the following conversion ratio: 0.068046 atmospheres/pounds per square inch.
Since one pounds per square inch is equal to 0.068046 atmospheres, you can use this simple formula to convert:
The pressure in atmospheres is equal to the pressure in psi multiplied by 0.068046.
For example, here's how to convert 5 psi to atmospheres using the formula above.
How Many Atmospheres Are in a Pounds per Square Inch?
There are 0.068046 atmospheres in a pounds per square inch, which is why we use this value in the formula above.
Our pounds per square inch to standard atmosphere calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
PSI and atmospheres are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Pounds per Square Inch?
A pounds per square inch is a unit of pressure equal to 6,894.7572932 pascals (Pa), the base unit for pressure. Imperial & US pressure unit equal to 1 pound-force per square inch (6.89476 kPa). [1]
The pounds per square inch is classified as a US customary and imperial unit of pressure. PSI can be abbreviated as psi; for example, 1 pounds per square inch can be written as 1 psi.
When working with psi (psi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, psi (psi) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Standard Atmosphere?
A standard atmosphere is a unit of pressure equal to 101,325 pascals (Pa), the base unit for pressure. Standard sea-level atmospheric pressure defined as 101,325 Pascals. [2]
The standard atmosphere is classified as a standard unit of pressure. Atmospheres can be abbreviated as atm; for example, 1 standard atmosphere can be written as 1 atm.
When working with atmospheres (atm) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, atmospheres (atm) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within international standard workflows, engineering documentation, and technical data sheets.
When converting pressure between psi (psi) and atmospheres (atm), keep full floating-point precision (1 psi = 0.068046 atm; 1 atm = 14.6959488 psi) during intermediate calculations and round only the final standard atmosphere figure to match your instrument tolerance.
More Pounds per Square Inch & Standard Atmosphere Conversions
Need to calculate in the opposite direction? Use our atmospheres to psi converter (atm to psi) to switch your starting unit immediately. You can also explore related tools such as converting bars to atmospheres, converting torr to atmospheres, or converting psi to bars.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — PSI (psi) to Atmospheres (atm)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Pounds per Square Inch (psi) & Standard Atmosphere (atm)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (psi to atm)