Reference for one unit; displayed values may be rounded.
PSI
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Atmosphere
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Method and sourcePSI to Atmosphere Conversion Formula
To convert PSI to atmospheres, multiply the PSI value by 0.068046. One standard atmosphere equals 101,325 Pa, and one PSI equals 6,894.76 Pa, so it takes 14.695943 PSI to make 1 atm.
PSI and Atmosphere Explained
PSI (psi)
PSI (pound-force per square inch) is the imperial pressure unit: one pound of force bearing on one square inch. It equals 6,894.76 pascals, or 0.068046 of a standard atmosphere. The scale fits American hardware naturally — sea-level air reads 14.7 PSI, car tires 32-36 PSI, and scuba cylinders 3,000 PSI — and gauge readings labeled PSIG measure above the surrounding atmosphere rather than including it.
Where it is used: PSI is the default pressure unit in the United States for tires, compressors, diving cylinders sold domestically, plumbing, and industrial equipment.
Origin: The unit emerged from 19th-century British engineering, pairing the imperial pound-force with the square inch, and persists as a US customary standard.
Atmosphere (atm)
The standard atmosphere (atm) is a fixed reference pressure of exactly 101,325 pascals, chosen to represent average sea-level air. It converts gauge readings into earth-scale statements: a 44 PSI truck tire holds nearly 3 atm, an airliner cabin about 0.74 atm at cruise, and a 3,000 PSI scuba charge about 204 atm. Diving, altitude physiology, and hyperbaric medicine lean on it because depth and treatment tables are written in whole atmospheres.
Where it is used: Atmospheres anchor scuba training tables, hyperbaric therapy protocols, aviation cabin standards, and chemistry reference conditions.
Origin: Nineteenth-century metrologists sought a "normal" air pressure for gas measurements; the value was ultimately fixed at exactly 101,325 Pa by international agreement in the 1950s.
PSI to Atmosphere Conversion Table
Select a value to use it in the calculator.
| PSI (psi) | Atmosphere (atm) |
|---|---|
| 0.0680459639 atm | |
| 0.1360919278 atm | |
| 0.3402298195 atm | |
| 0.6804596391 atm | |
| 0.748505603 atm | |
| 0.9866664767 atm | |
| 1.0002756695 atm | |
| 1.0206894586 atm | |
| 1.3609192782 atm | |
| 1.7011490977 atm | |
| 2.0413789173 atm | |
| 2.7218385564 atm | |
| 3.4022981955 atm | |
| 4.0827578346 atm | |
| 5.4436771128 atm | |
| 6.804596391 atm | |
| 10.2068945865 atm | |
| 13.609192782 atm |
Atmosphere to PSI Conversion Table
| Atmosphere (atm) | PSI (psi) |
|---|---|
| 0.1 atm | 1.4695948776 psi |
| 0.25 atm | 3.6739871939 psi |
| 0.33 atm | 4.8496630959 psi |
| 0.5 atm | 7.3479743878 psi |
| 0.75 atm | 11.0219615816 psi |
| 1 atm | 14.6959487755 psi |
| 1.5 atm | 22.0439231633 psi |
| 2 atm | 29.391897551 psi |
| 2.5 atm | 36.7398719388 psi |
| 3 atm | 44.0878463265 psi |
| 5 atm | 73.4797438776 psi |
| 10 atm | 146.9594877551 psi |
| 20 atm | 293.9189755103 psi |
PSI to Atmosphere in Everyday Objects
Common real-world examples that make PSI and Atmosphere easy to picture at a glance.
| PSI (psi) | Atmosphere (atm) | |
|---|---|---|
| Sea-level air pressure | 14.7 psi | 1.0002756695 atm |
| A full scuba cylinder | 3000 psi | 204.1378917296 atm |
| An airliner cabin | 11 psi | 0.748505603 atm |
| A hyperbaric session | 37 psi | 2.5177006647 atm |
| A mountain bike tire | 30 psi | 2.0413789173 atm |
| A paintball cylinder charge | 4500 psi | 306.2068375944 atm |
When You Need PSI to Atmosphere Conversions
Scuba Dive Planning
Divers check a 3,000 PSI fill before the boat leaves — 204.1 atm absolute — then track depth in whole atmospheres, one added per 10 meters.
Hyperbaric Oxygen Therapy
A US clinic gauge shows 36.7 PSI inside the chamber; converting gives 2.5 atm, the standard wound-treatment pressure for the session record.
Aircraft Cabin Checks
Maintenance logs a cabin pressure of 10.9 PSI at cruise altitude — 0.74 atm, matching the 8,000-foot equivalent cabin standard.
Pressure-Vessel Certification
A hydrostatic test presses a vessel to 100 PSI and the certification sheet for the SI archive needs 6.8 atm as the recorded figure.
Related Pressure Conversions
How to Use
-
1
Enter PSI Value
Type the PSI reading — typical entries include sea-level air (14.7 PSI), scuba cylinders (3,000 PSI), and aircraft cabins (10-12 PSI)
-
2
View Atmosphere Result
The atm equivalent appears instantly. For example, 30 PSI converts to about 2.04 atm
-
3
Copy or Swap
Copy the result or click Swap to convert atmospheres back to PSI
-
4
Check Gauge vs Absolute
Remember that most gauges read PSIG (above ambient air). Add 14.7 PSI — one more atmosphere — before comparing to absolute-pressure figures
Why Use Be Converter?
Instant Conversion
Get precise PSI to atm results in real-time as you type — perfect for dive planning and chamber logs
High Accuracy
Uses the exact international standard: 1 atm = 101,325 Pa and 1 PSI = 6,894.76 Pa, accurate to 6 decimal places
Conversion Table
Quick reference with common values like 14.7 PSI (1.0 atm), 44 PSI (2.99 atm), and 3,000 PSI (204.1 atm)
Bidirectional
Easily swap between PSI and atmospheres with one click for reverse conversions
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Frequently Asked Questions
How many atmospheres is 1 PSI?
What is 14.7 PSI in atm?
What is the difference between PSI and atm?
How do I convert scuba tank pressure from PSI to atm?
Do I add atmospheric pressure when converting?
How many atmospheres is 40 PSI?
How deep underwater is 3 atm?
What is 2000 PSI in atm?
About PSI to Atmosphere Converter
Our free online PSI to atmosphere converter expresses American gauge readings in earth-scale terms. Whether you are planning a scuba dive with a 3,000 PSI cylinder, documenting a hyperbaric chamber that a US clinic gauge shows in PSI, verifying aircraft cabin pressurization, or certifying a pressure vessel for an SI archive, this tool delivers the exact equivalent. PSI is the imperial unit entrenched in US equipment, while the standard atmosphere — fixed at 101,325 Pa — anchors diving tables, altitude physiology, and hyperbaric medicine. Our converter applies the exact factor where 1 PSI equals 0.068046 atm.
Expert Tips for PSI to Atmosphere Conversion
Anchor points worth memorizing: 14.7 PSI ≈ 1 atm, 30 PSI ≈ 2.04 atm, 44 PSI ≈ 2.99 atm, and 3,000 PSI ≈ 204.1 atm — sea level, car tire, truck tire, and scuba cylinder
In diving, add one atmosphere per 10 meters of seawater: at 20 m you breathe about 3 atm absolute regardless of what the tank gauge says
Hyperbaric oxygen therapy commonly runs 2.0-2.5 atm absolute — 29.4 to 36.7 PSI on the clinic gauge — and treatment logs may require both figures
Aircraft cabins hold near 10.9 PSI absolute at cruise (0.74 atm), equivalent to an 8,000-foot mountain altitude — a quick check for pressurization diagnostics
Always settle gauge-vs-absolute before converting: PSIG readings omit the 14.7 PSI of ambient air, and dive/medical numbers are almost always absolute
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