1 psi = 0.068046 atm
1 pound per square inch equals 0.068046 standard atmospheres. To convert pounds per square inch to standard atmospheres, multiply the pound per square inch value by 0.068046. For quick reference: 1 psi = 0.068046 atm, 5 psi = 0.34023 atm, 10 psi = 0.68046 atm, 100 psi = 6.8046 atm.
Standard atmospheres = Pounds per square inch × 0.068046Start with your value in pounds per square inch.
Multiply the pound per square inch value by 0.068046. This is the exact conversion factor from pounds per square inch to standard atmospheres.
The product is your value in standard atmospheres. For example, 5 psi × 0.068046 = 0.34023 atm.
The exact factor from pounds per square inch to standard atmospheres is 0.068046.
Standard atmospheres = Pounds per square inch × 0.068046
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Pounds per square inch (psi) | Standard atmospheres (atm) |
|---|---|
| 0.001 psi | 6.8046 × 10^−5 atm |
| 0.01 psi | 0.00068046 atm |
| 0.1 psi | 0.0068046 atm |
| 0.5 psi | 0.034023 atm |
| 1 psi | 0.068046 atm |
| 1.5 psi | 0.10207 atm |
| 2 psi | 0.13609 atm |
| 2.5 psi | 0.17011 atm |
| 3 psi | 0.20414 atm |
| 4 psi | 0.27218 atm |
| 5 psi | 0.34023 atm |
| 6 psi | 0.40828 atm |
| 7 psi | 0.47632 atm |
| 8 psi | 0.54437 atm |
| 9 psi | 0.61241 atm |
| 10 psi | 0.68046 atm |
| 14 psi | 0.95264 atm |
| 15 psi | 1.0207 atm |
| 20 psi | 1.3609 atm |
| 25 psi | 1.7011 atm |
| 30 psi | 2.0414 atm |
| 32 psi | 2.1775 atm |
| 35 psi | 2.3816 atm |
| 40 psi | 2.7218 atm |
| 50 psi | 3.4023 atm |
| 60 psi | 4.0828 atm |
| 75 psi | 5.1034 atm |
| 80 psi | 5.4437 atm |
| 100 psi | 6.8046 atm |
| 101.325 psi | 6.8948 atm |
| 150 psi | 10.207 atm |
| 200 psi | 13.609 atm |
| 250 psi | 17.011 atm |
| 300 psi | 20.414 atm |
| 400 psi | 27.218 atm |
| 500 psi | 34.023 atm |
| 760 psi | 51.715 atm |
| 1000 psi | 68.046 atm |
| 1013.25 psi | 68.948 atm |
| 2000 psi | 136.09 atm |
| 5000 psi | 340.23 atm |
| 10000 psi | 680.46 atm |
| 14.7 psi | 1.0003 atm |
| 50000 psi | 3402.3 atm |
| 100000 psi | 6804.6 atm |
| 101325 psi | 6894.8 atm |
| 200000 psi | 13609 atm |
| 500000 psi | 34023 atm |
| 1000000 psi | 68046 atm |
| 10000000 psi | 680460 atm |
Most US passenger-car tires call for 32–35 psi. A typical bicycle tire runs 50–80 psi. In standard atmospheres, that gives you: 1 psi = 0.068046 atm, 10 psi = 0.68046 atm, 100 psi = 6.8046 atm.
The pound per square inch (psi) is the customary US pressure unit, derived from the avoirdupois pound-force on a square inch (≈ 6,894.76 Pa exactly). It is the standard unit on US car tire-pressure stickers, scuba gauges in the US, and most plumbing specifications.
The standard atmosphere (atm) is defined as exactly 101,325 Pa. It is the conventional reference for chemistry (gas-law calculations), aviation altimetry, and historic engineering. Despite the name, it is not the actual atmospheric pressure at any single place — that varies daily.