Atmospheres to PSI Converter
Enter the pressure in atmospheres below to convert it to psi.
Convert Atmospheres to PSI
Enter a value in atmospheres (atm) to convert to psi (psi).
Standard Atmosphere to Pounds per Square Inch Conversion Table
Table showing various standard atmosphere measurements converted to psi. Click any preset value or arrow to load it into the converter.
| Atmospheres (atm) | PSI (psi) |
|---|---|
| 1 atm | 14.6959488 psi |
| 2 atm | 29.3918976 psi |
| 4 atm | 58.7837951 psi |
| 5 atm | 73.4797439 psi |
| 10 atm | 146.9594878 psi |
| 15 atm | 220.4392316 psi |
| 20 atm | 293.9189755 psi |
| 25 atm | 367.3987194 psi |
| 30 atm | 440.8784633 psi |
| 50 atm | 734.7974388 psi |
How to Convert Atmospheres to PSI
To convert atmospheres to psi, multiply the pressure by the following conversion ratio: 14.6959488 psi/standard atmosphere.
Since one standard atmosphere is equal to 14.6959488 psi, you can use this simple formula to convert:
The pressure in psi is equal to the pressure in atmospheres multiplied by 14.6959488.
For example, here's how to convert 2 atmospheres to psi using the formula above.
How Many PSI Are in a Standard Atmosphere?
There are 14.6959488 psi in a standard atmosphere, which is why we use this value in the formula above.
Our standard atmosphere to pounds per square inch calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Atmospheres and psi are both units used to measure pressure. Keep reading to learn more about each unit.
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. [1]
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.
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). [2]
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.
When converting pressure between atmospheres (atm) and psi (psi), keep full floating-point precision (1 atm = 14.6959488 psi; 1 psi = 0.068046 atm) during intermediate calculations and round only the final pounds per square inch figure to match your instrument tolerance.
More Standard Atmosphere & Pounds per Square Inch Conversions
Need to calculate in the opposite direction? Use our psi to atmospheres calculator to switch your starting unit immediately. You can also explore related tools such as converting psi to atmospheres, converting bars to psi, or converting kilopascals to psi.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Atmospheres (atm) to PSI (psi)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Standard Atmosphere (atm) & Pounds per Square Inch (psi)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (atm to psi)