Convert atmospheres to psi instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Atmospheres to PSI uses 14.6959, since one standard atmosphere is 101,325 pascals, or 14.6959 pounds per square inch. It links the pressure of the air around you at sea level to the units used for tyres, compressors and scuba tanks. Two atmospheres is 29.4 psi, close to a car tyre's recommended pressure, and a typical scuba cylinder is filled to around 200 bar, or about 197 atmospheres. Gauges usually show pressure above the atmosphere, so the absolute value is the gauge reading plus about 14.7 psi.
How to convert atmospheres to psi
Multiply the value by 14.6959488.
psi = atm × 14.6959488Example: 10 atm = 146.9595 psi.
Atmospheres to PSI conversion table
| Atmospheres (atm) | PSI (psi) |
|---|---|
| 1 atm | 14.6959 psi |
| 2 atm | 29.3919 psi |
| 3 atm | 44.0878 psi |
| 4 atm | 58.7838 psi |
| 5 atm | 73.4797 psi |
| 10 atm | 146.9595 psi |
| 15 atm | 220.4392 psi |
| 20 atm | 293.919 psi |
| 25 atm | 367.3987 psi |
| 50 atm | 734.7974 psi |
| 100 atm | 1469.5949 psi |
Frequently asked questions
How many psi is 1 atmosphere?
1 atmosphere equals 14.6959 psi.
What is the formula to convert atm to psi?
To convert atm to psi, multiply the value by 14.6959488. The full formula is: psi = atm × 14.6959488.
How do I convert psi back to atmospheres?
Use the same calculator above and type your value into the psi field instead — it converts in both directions. Or use the reverse formula: atm = psi ÷ 14.6959488.
Is the atm to psi conversion exact?
The conversion factor used here (14.6959488) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.