Science, Tech, Math › Science Converting Pounds Per Square Inch or PSI to Atmospheres Worked Pressure Unit Conversion Problem Share Flipboard Email Print Need to fill up your bicycle tires? It's helpful to know how to convert between PSI and atm!. Susanna Price, Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated May 09, 2019 This example problem demonstrates how to convert the pressure unit pounds per square inch (psi) to atmospheres (atm). PSI to Atm Problem A bicycle tire is inflated to 65 psi. What is this pressure in atmospheres?Solution:1 atm = 14.696 psiSet up the conversion so the desired unit will be canceled out. In this case, we want atm to be the remaining unit.pressure in atm = (pressure in psi) x (1 atm/14.696 psi)pressure in atm = (65/14.696) atmpressure in atm = 4.423 atmAnswer:The average sea level air pressure is 4.423 atm.