Psi to Atmospheres Converter
How to convert psi to atmospheres
atmospheres = psi ÷ 14.6959488
To convert psi to atmospheres, divide the number of psi by 14.6959488.
1 psi = 0.0680459639 atm
Examples
- A typical car tire pressure: 32 psi ÷ 14.6959488 = 2.17747085 atm
- 100 psi ÷ 14.6959488 = 6.80459639 atm
Good to know
One standard atmosphere is about 14.696 psi, often rounded to 14.7 psi. Add this to a gauge reading (psig) to get absolute pressure (psia).
Psi means pounds-force per square inch (lbf/in²). Gauge readings (psig) are measured relative to atmospheric pressure, absolute readings (psia) relative to a vacuum; the conversion factor is the same for both.
This is the standard atmosphere (atm), exactly 101,325 Pa. It is not the technical atmosphere (at), which is 1 kgf/cm² or 98,066.5 Pa.
Psi to atmospheres conversion table
| Psi | Atmospheres (atm) |
|---|---|
| 1 psi | 0.0680459639 atm |
| 5 psi | 0.34022982 atm |
| 10 psi | 0.680459639 atm |
| 14.7 psi | 1.00027567 atm |
| 15 psi | 1.02068946 atm |
| 20 psi | 1.36091928 atm |
| 25 psi | 1.7011491 atm |
| 30 psi | 2.04137892 atm |
| 32 psi | 2.17747085 atm |
| 35 psi | 2.38160874 atm |
| 40 psi | 2.72183856 atm |
| 45 psi | 3.06206838 atm |
| 50 psi | 3.4022982 atm |
| 60 psi | 4.08275783 atm |
| 80 psi | 5.44367711 atm |
| 100 psi | 6.80459639 atm |
Unit definitions
- Psi
- Psi is one pound-force per square inch, about 6894.757 pascals. It is the everyday pressure unit in the United States, used for tires, compressors and plumbing.
- Atmosphere (atm)
- The standard atmosphere is defined as exactly 101,325 pascals, approximately the average air pressure at sea level. It is used as a reference pressure in chemistry and physics.