Unit converter
Atmospheres to PSI.
Convert atm to psi and psi to atm. Type in either box and the other follows. The standard atmosphere is a defined constant of exactly 101 325 Pa, so 1 atm is 14.696 psi — not whatever the pressure outside happens to be today.
| atm | psi |
|---|---|
| 0.5 atm | 7.34797 psi |
| 1 atm | 14.6959 psi |
| 1.5 atm | 22.0439 psi |
| 2 atm | 29.3919 psi |
| 3 atm | 44.0878 psi |
| 5 atm | 73.4797 psi |
| 10 atm | 146.959 psi |
| 20 atm | 293.919 psi |
| 50 atm | 734.797 psi |
- Conversion goes through Pa in both directions, so neither figure is rounded on the way.
Definitions
- The standard atmosphere is defined as exactly 101 325 Pa. It is a fixed reference, not the pressure outside today.
- The pound per square inch is exactly 6894.757 293 Pa. UK and US tyre gauges are still marked in it.
- This conversion is exact by definition. 1 atm = 14.69594878 psi.
- Pressure is converted through Pa.
How it works
One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.
The value passes through Pa, the unit every other pressure unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general pressure converter always agree.
Display precision sets a maximum number of significant figures and trims trailing zeroes, so it changes what you see and never what was calculated. The editable box always holds a plain number at full working precision, so you can carry on from either side.
Common questions this answers: how many pounds per square inch in a standard atmosphere (14.6959), how many standard atmospheres in a pound per square inch (0.068046), and what 1 atm is in pounds per square inch (14.6959 psi).
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