Atm to Psi Converter
Convert atmospheres to psi instantly. Free atm to psi converter for pressure conversions.
Formula
PSI = atm × 14.696
Common Conversions
How to Convert ATM to PSI
1 atmosphere = 14.696 psi. Multiply atm by 14.696 to get psi. So 2 atm = 29.39 psi. The 'atmosphere' is the average pressure at sea level - roughly 1.013 bar or 14.696 psi. Different from gauge pressure systems where atmospheric is the zero reference.
Used in: scuba diving (depth conversions: 1 atm = 10 metres of seawater), industrial pressure ratings, scientific calculations. A scuba diver at 20 metres = 3 atm absolute pressure = 44.1 psi. Vacuum measurements: 0.5 atm = 7.35 psi. Espresso pressure: 9 bar = 8.88 atm = 130.5 psi.
Common ATM to PSI
| Atmosphere | PSI |
|---|---|
| 0.5 atm | 7.35 |
| 1 atm (sea level) | 14.70 |
| 1.5 atm | 22.04 |
| 2 atm (10m underwater) | 29.39 |
| 3 atm (20m underwater) | 44.09 |
| 5 atm (40m underwater) | 73.48 |
| 8.88 atm (espresso) | 130.50 |
| 10 atm | 146.96 |
Frequently Asked Questions
Why does sea level matter?
1 atmosphere is the reference pressure for sea level on Earth. Above sea level (mountains, aircraft cabins) pressure decreases. Below sea level (underwater, submarines) pressure increases by 1 atm per 10 metres of seawater. Pressure rating systems often use atm as the meaningful zero reference.
Is atm same as 'bar'?
Close but not identical. 1 bar = 0.987 atm = 14.504 psi. 1 atm = 1.013 bar = 14.696 psi. The 1.3% difference rarely matters in casual use; precision contexts (scientific, engineering) use the exact units. Both are common metric pressure units.
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