PSI to ATM Converter

How to Convert PSI to ATM

PSI (pounds per square inch) and ATM (atmospheres) are both units of pressure used in science, engineering, and everyday applications. PSI is common in the United States for tire pressure, scuba tanks, and industrial equipment. ATM is a standard unit in chemistry and physics, where 1 atmosphere represents average sea-level air pressure.

One atmosphere equals approximately 14.69594 psi. This conversion is essential when reading scientific literature, comparing international pressure standards, or working with gas law calculations that use atmospheres.

For other pressure conversions, try our MMHG to ATM Converter, Pressure Converter, or PSIG to PSIA Converter.

The Conversion Formula

To convert PSI to atmospheres:

$$\text{ATM} = \text{PSI} \times 0.068046$$

To convert atmospheres to PSI:

$$\text{PSI} = \text{ATM} \times 14.69594$$

For example, 14.69594 psi equals exactly 1 atm, and 32 psi (a typical car tire) equals approximately 2.18 atm.

Common PSI to ATM Values

• 14.696 psi = 1 atm (standard atmospheric pressure)
• 29.4 psi = 2 atm (scuba tank starting pressure)
• 32 psi = 2.18 atm (car tire pressure)
• 100 psi = 6.80 atm (industrial compressed air)
• 3000 psi = 204.14 atm (high-pressure cylinder)

When to Use ATM vs PSI

Use atmospheres when working with the ideal gas law, chemical equilibrium constants, or scientific papers that reference standard conditions. Use PSI for practical applications like checking tire pressure, reading pressure gauges on US equipment, or specifying hydraulic system ratings.

Our converter works in both directions, so you can enter either PSI or ATM and get the equivalent value immediately.