PSI to Atmospheres (atm) Conversion Chart
Reference chart converting PSI to standard atmospheres (atm). Covers 1–10,000 PSI — for engineering, diving, autoclave, and scientific pressure applications.
For a custom value not in this chart, use the interactive Pounds per Square Inch to Atmosphere converter.
| Pounds per Square Inch (psi) | Atmosphere (atm) |
|---|---|
| 1 psi | 0.068046 atm |
| 5 psi | 0.34023 atm |
| 10 psi | 0.68046 atm |
| 14.696 psi | 1 atm |
| 20 psi | 1.36092 atm |
| 30 psi | 2.04138 atm |
| 35 psi | 2.38161 atm |
| 40 psi | 2.72184 atm |
| 50 psi | 3.4023 atm |
| 75 psi | 5.10345 atm |
| 100 psi | 6.8046 atm |
| 150 psi | 10.2069 atm |
| 200 psi | 13.6092 atm |
| 300 psi | 20.4138 atm |
| 500 psi | 34.023 atm |
| 1000 psi | 68.046 atm |
| 2000 psi | 136.092 atm |
| 3000 psi | 204.138 atm |
| 5000 psi | 340.23 atm |
| 10000 psi | 680.46 atm |
Conversion Formula
atm = PSI × 0.068046 PSI = atm × 14.6959 1 PSI = 0.068046 atm 1 atm = 14.696 PSI Reference conversions: 14.7 PSI = 1.00 atm (standard atmospheric pressure) 30 PSI = 2.04 atm (typical car tire gauge pressure) 32 PSI = 2.18 atm 100 PSI = 6.80 atm (workshop compressor outlet) 150 PSI = 10.20 atm (pneumatic system) 3,000 PSI = 204.1 atm (scuba tank fill pressure) Note: tire PSI values above are GAUGE (above atmospheric). Absolute = gauge + 14.696 PSI
Frequently Asked Questions
How many atmospheres is 30 PSI?
30 PSI × 0.068046 = 2.04 atm. A car tire inflated to 30 PSI gauge is at approximately 2 atmospheres gauge pressure — or 3 atm absolute (gauge + 1 atm atmospheric).
How many PSI is 2 atm?
2 atm × 14.6959 = 29.39 PSI. In scuba diving, 2 atm absolute is the pressure at approximately 10 meters (33 feet) of seawater depth.
What pressure does a scuba tank hold in atm?
A standard scuba tank filled to 3,000 PSI holds 3,000 × 0.068046 = 204 atm absolute. The tank itself is rated to withstand 5/3 of its working pressure (test pressure). A 3,000 PSI (204 atm) tank is hydrostatic-tested to 5,000 PSI (340 atm).
At what PSI does the human body feel pressure effects?
At 1 atmosphere above ambient (14.7 PSI gauge = 2 atm absolute, equivalent to 10 m depth), decompression considerations begin. The bends (decompression sickness) occurs when dissolved nitrogen forms bubbles during rapid pressure reduction. Recreational divers follow conservative dive tables to stay within safe limits.
How is atm used in chemistry?
Chemists use atm in gas law calculations (PV=nRT). Standard Temperature and Pressure (STP) is 0°C and 1 atm. Standard Ambient Temperature and Pressure (SATP) is 25°C and 1 bar (≈ 0.987 atm). When a problem gives pressure in PSI, convert to atm (÷ 14.696) before using gas law formulas.
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Use the interactive converter →All conversion values are calculated using internationally recognized conversion factors. Results are provided for general informational purposes — verify critical values independently. Read our full disclaimer.