In 1 atmospheres there are 14.695949 pounds per square inch. Meanwhile in 1 pounds per square inch there are 0.068046 atmospheres. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Pounds per square inch to Atmospheres calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert atmospheres (atm) to pounds per square inch (psi), use a fixed pressure conversion factor.
Example:
Quick checks to catch mistakes:
1 atmosphere equals 14.6959 psi (often rounded to 14.7 psi).
To convert atm to psi, multiply the atm value by 14.6959.
To convert psi to atm, divide the psi value by 14.6959.
Example: 29.4 psi ÷ 14.6959 ≈ 2.00 atm.
One atmosphere is based on standard sea-level air pressure. That same pressure equals about 14.7 pounds of force per square inch. The psi value comes from the same pressure written in different units.
Yes, atm is an absolute pressure unit. It measures pressure compared to a perfect vacuum. This matters in physics, gas laws, and lab work.
Not always. Psi can be gauge (psig) or absolute (psia).
Tire pressure is almost always gauge pressure (psig). Standard atm is absolute, so you need to match types. If you only need a rough conversion, multiply atm by 14.7 and treat it as psi, but this can be off when gauge vs absolute matters.
Using 1 atm = 14.6959 psi:
Rounding to 14.7 psi is fine for quick estimates. Use 14.6959 psi when you need more exact results, like lab data, engineering work, or tight specs.
No. The unit conversion between atm and psi is fixed. Temperature changes can affect the pressure in a system, but they don’t change how atm converts to psi.
Standard atmospheric pressure is 1 atm, which equals 14.6959 psi. Many charts round this to 14.7 psi.
Use this formula:
psi = atm × 14.6959
For a quick estimate, you can use:
psi ≈ atm × 14.7
The Calculate Box tool to convert atmospheres to pounds per square inch uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a atmospheres value in the box and have it instantly converted to pounds per square inch.