Conversion Formula
$$P_{\text{atm}} = \frac{P_{\text{psi}}}{14.6959}$$
Divide the pressure in PSI by 14.6959 to get standard atmospheres.
psi to atm Conversion Table
| Pound per Square Inch (psi) | Standard Atmosphere (atm) |
|---|---|
| 0.1 | 0.0068046 |
| 0.5 | 0.034023 |
| 1 | 0.068046 |
| 2 | 0.136092 |
| 5 | 0.34023 |
| 10 | 0.68046 |
| 25 | 1.70115 |
| 50 | 3.4023 |
| 100 | 6.8046 |
| 250 | 17.0115 |
| 500 | 34.023 |
| 1,000 | 68.046 |
psi to atm in Engineering
Pressure conversions are essential across all engineering disciplines — from structural loads (PSI, ksi) to fluid systems (feet of water, mmHg) to atmospheric science (atm, mbar). Accurate pressure conversion is critical for piping design, HVAC, and geotechnical analysis.
Pound per Square Inch: Primary US customary pressure unit. Used extensively in mechanical, civil, and petroleum engineering in the United States.
Standard Atmosphere: Defined as exactly 101,325 Pa. Reference pressure for many engineering calculations and chemical processes.