For all pressure unit conversions, please check pressure conversion.
1 Psi = 0.0680459639 Atm
Psi is defined as 1 pound of force per square inch. 1 pound per square inch (psi) equals to 6 894.75729 pascals.
Atm (or atmospheric pressure) is defined as the force per unit area by the weight of air above that point. 1 atmosphere is about 101.325 kilopascals.