PSI to Atmospheres Converter | Free Australian Pressure Tool
Convert psi to atm as you type.
Pressure Converter - Convert kPa, PSI, Bar & More InstantlyReference 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 — the 101.3 kPa you'll see on Bureau of Meteorology charts — 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 an 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. Although Australia officially measures pressure in kilopascals, PSI still appears everywhere in practice — tyre chats, imported compressors, dive gauges and older workshop equipment. Sea-level air reads 14.7 PSI, a typical hatch tyre 32 PSI, and a full scuba cylinder upwards of 3,000 PSI — and readings labelled PSIG measure above the surrounding atmosphere rather than including it.
Where it is used: PSI persists as the everyday pressure unit in Australian workshops, 4WD and boating circles, and dive shops, even though official documentation favours kilopascals.
Origin: The unit emerged from 19th-century British engineering, pairing the imperial pound-force with the square inch, and travelled to Australia through inherited standards and imported equipment.
Atmosphere (atm)
The standard atmosphere (atm) is a fixed reference pressure of exactly 101,325 pascals — the 101.3 kPa quoted in Australian weather reports — chosen to represent average sea-level air. It converts gauge readings into earth-scale statements: a 32 PSI tyre holds about 2.2 atm, an airliner cabin about 0.74 atm at cruise, and a 3,000 PSI scuba fill about 204 atm. Diving medicine, altitude physiology and hyperbaric treatment 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 at cruise | 11 psi | 0.748505603 atm |
| A hyperbaric session | 37 psi | 2.5177006647 atm |
| A mountain bike tyre | 30 psi | 2.0413789173 atm |
| A paintball cylinder charge | 4500 psi | 306.2068375944 atm |
When You Need PSI to Atmosphere Conversions
Great Barrier Reef Dive Planning
Divers check a 3,000 PSI fill before the boat leaves Cairns — 204.1 atm absolute — then track depth in whole atmospheres, one added per 10 metres.
Hyperbaric Oxygen Therapy
A chamber gauge shows 36.7 PSI inside the unit; converting gives 2.5 atm, the standard wound-treatment pressure recorded in the session log at hospitals such as Royal Adelaide.
Aircraft Cabin Checks
Maintenance logs a cabin pressure of 10.9 PSI at cruise altitude on the Sydney–Perth route — 0.74 atm, matching the roughly 2,400-metre equivalent cabin standard.
Pressure-Vessel Certification
A hydrostatic test presses a vessel to 100 PSI and the certification sheet, written up against Australian Standards, records 6.8 atm as the figure for the SI archive.
Related Pressure Conversions
How to Use
-
1
Enter PSI Value
Type the PSI reading — typical entries include sea-level air (14.7 PSI), a dive cylinder filled to 3,000 PSI, and highway tyre pressures around 32-36 PSI. If your tyre placard shows kPa, 220 kPa is roughly 32 PSI
-
2
View Atmosphere Result
The atm equivalent appears instantly. For example, 32 PSI — a typical HiLux tyre pressure — converts to about 2.18 atm
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3
Copy or Swap
Copy the result or click Swap to convert atmospheres back to PSI
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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 reef dive planning and 4WD tyre-pressure checks before a sand run
High Accuracy
Uses the exact international standard: 1 atm = 101,325 Pa and 1 PSI = 6,894.76 Pa, accurate to 6 decimal places — the same figures used in diving medicine
Conversion Table
Quick reference with common values like 14.7 PSI (1.0 atm), 32 PSI highway tyre pressure (2.18 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 puts imported gauge readings into earth-scale terms. Whether you're planning a dive on the Great Barrier Reef with a cylinder filled to 3,000 PSI, dropping your 4WD's tyre pressures for a sand run on K'gari or Stockton Beach, logging a hyperbaric oxygen session, or checking cabin pressurisation on a Perth-to-Sydney flight, this tool delivers the exact equivalent. Officially, Australia works in kilopascals, but PSI persists on imported compressors, dive gauges and workshop gear, 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 memorising: 14.7 PSI ≈ 1 atm, 32 PSI ≈ 2.18 atm, 18 PSI ≈ 1.22 atm, and 3,000 PSI ≈ 204.1 atm — sea level, highway tyre pressure, soft-sand pressure, and a scuba cylinder
In diving, add one atmosphere per 10 metres of seawater: at 20 m on a Queensland reef you breathe about 3 atm absolute regardless of what the cylinder gauge says
Hyperbaric oxygen therapy commonly runs 2.0-2.5 atm absolute — 29.4 to 36.7 PSI on the chamber gauge — and treatment units record both figures in session logs
Airliner cabins hold near 10.9 PSI absolute at cruise (0.74 atm), equivalent to an altitude of about 2,400 metres — a quick check for pressurisation diagnostics on a long-haul flight
Always settle gauge-versus-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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