Atmospheres (atm) to PSI Conversion Chart
Reference chart converting standard atmospheres (atm) to PSI. Covers 0.1–1,000 atm — for diving, scientific, industrial, and engineering pressure calculations.
For a custom value not in this chart, use the interactive Atmosphere to Pounds per Square Inch converter.
| Atmosphere (atm) | Pounds per Square Inch (psi) |
|---|---|
| 0.1 atm | 1.46959 psi |
| ½ atm | 7.34797 psi |
| 1 atm | 14.6959 psi |
| 1.5 atm | 22.0439 psi |
| 2 atm | 29.3919 psi |
| 3 atm | 44.0878 psi |
| 5 atm | 73.4797 psi |
| 10 atm | 146.959 psi |
| 15 atm | 220.439 psi |
| 20 atm | 293.919 psi |
| 25 atm | 367.399 psi |
| 30 atm | 440.878 psi |
| 40 atm | 587.838 psi |
| 50 atm | 734.797 psi |
| 75 atm | 1102.2 psi |
| 100 atm | 1469.59 psi |
| 200 atm | 2939.19 psi |
| 300 atm | 4408.78 psi |
| 500 atm | 7347.97 psi |
| 1000 atm | 14695.9 psi |
Conversion Formula
PSI = atm × 14.6959 atm = PSI ÷ 14.6959 (= PSI × 0.068046) 1 atm = 101,325 Pa = 14.696 PSI = 1.01325 bar = 760 mmHg Diving depth reference (salt water at 1.025 g/cm³): Sea level = 1 atm = 14.70 PSI (gauge = 0 PSI) 10 m depth = 2 atm abs = 14.70 PSI gauge 20 m depth = 3 atm abs = 29.39 PSI gauge 30 m depth = 4 atm abs = 44.09 PSI gauge (max rec. recreational) 40 m depth = 5 atm abs = 58.78 PSI gauge Industrial reference: 10 atm = 147.0 PSI (high-pressure autoclave) 100 atm = 1,470 PSI (deep-sea equipment)
Frequently Asked Questions
How many PSI is 1 atmosphere?
1 standard atmosphere (atm) = 14.696 PSI = 101.325 kPa = 1.01325 bar. This is the standard sea-level atmospheric pressure used as a reference in all pressure calculations.
How many atmospheres is 100 PSI?
100 PSI ÷ 14.696 = 6.804 atm. A workshop air compressor delivering 100 PSI operates at about 6.8 times atmospheric pressure.
How does pressure increase with diving depth?
In seawater, pressure increases by approximately 1 atm (14.70 PSI) for every 10 meters of depth. At 10 m depth: 2 atm absolute (1 atm from air + 1 from water). At 30 m: 4 atm absolute — the maximum recommended depth for recreational scuba divers.
What is the difference between absolute pressure and gauge pressure?
Absolute pressure (psia) measures pressure relative to a perfect vacuum (0 pressure). Gauge pressure (psig) measures pressure above atmospheric (relative to ambient air). A tire reading 35 PSI gauge = 35 + 14.696 = 49.7 psia absolute. At sea level, absolute = gauge + 14.696. In scientific contexts, always specify which type.
What is a standard atmosphere used for?
The standard atmosphere (atm) is used as a reference pressure in chemistry (STP conditions), diving (depth-pressure calculations), and atmospheric science. It equals exactly 101,325 pascals by SI definition. In everyday engineering, bar is often preferred because it is a round number close to 1 atm (1 bar = 0.987 atm).
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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.