PSI to Atmospheres Converter

How to convert PSI to Atmospheres

To convert PSI to Atmospheres, multiply the value in PSI by 0.068045991. For example, 5 psi = 0.34022995 atm.

If you need to convert from PSI to Atmospheres, the key figure to remember is that one PSI equals 0.068045991 Atmospheres. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert psi to atm with complete confidence.

Pressure conversions are used in weather forecasting, engineering, diving, automotive maintenance, and industrial processes. Different fields favor different units, making conversion a regular necessity.

Understanding PSI and Atmospheres

The pascal is the SI unit, but it's small, so kilopascals and bars are more practical for everyday use. PSI (pounds per square inch) dominates in US engineering and tire pressures, while atmospheres provide an intuitive reference point — 1 atm is roughly the air pressure at sea level. Weather reports use hectopascals or millibars, which are numerically identical.

How accurate is this conversion?

Pressure conversions are based on fixed physical definitions. One standard atmosphere equals exactly 101,325 pascals, and 1 bar equals exactly 100,000 pascals, so all conversions here are precise.

All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.

Quick reference: common PSI to Atmospheres values

The most frequently searched conversions are 1 PSI = 0.068045991 Atmospheres, 5 PSI = 0.34022995 Atmospheres, 10 PSI = 0.68045991 Atmospheres, and 100 PSI = 6.8045991 Atmospheres. The full table further down covers every common value, and the calculator handles any number you need in between.