Convert PSI to Atmospheres Online – Free psi-to-atm Pressure Calculator
Convert PSI to atmospheres free online — check car and bike tyre pressure in atm, plan dives in the Andamans, and verify cooker, CNG or chamber gauge readings. Instant, accurate PSI to atm results.
Online Pressure Converter - Bar to PSI, kPa & MoreThe quick answer for 1 PSI — type any value below for the exact result
PSI
Atmosphere
PSI to Atmosphere Conversion Formula
To convert PSI to atmospheres, multiply the PSI value by 0.068046. One standard atmosphere equals 101,325 pascals (about 1.01 lakh 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 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. Indian tyre inflators, petrol-pump air stations, and imported compressors still read in PSI — sea-level air is 14.7 PSI, most hatchback tyres run 30-34 PSI, and dive cylinders are filled to 3,000 PSI — with gauge readings labelled PSIG measuring above the surrounding atmosphere rather than including it.
Where it is used: PSI is widely used across India for tyre pressure, CNG and industrial cylinders, compressors, plumbing, and workshop equipment, usually printed alongside kg/cm² on the same dial.
Origin: The unit emerged from 19th-century British engineering, pairing the imperial pound-force with the square inch, and persisted through colonial-era industry into modern Indian workshops and fuel stations.
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 32 PSI car tyre holds about 2.18 atm, a cooker on the stove roughly 2 atm absolute, and a 3,000 PSI dive charge about 204 atm. Scuba diving in the Andamans, altitude physiology for Ladakh treks, 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
| PSI (psi) | Atmosphere (atm) |
|---|---|
| 1 psi | 0.0680459906 atm |
| 2 psi | 0.1360919812 atm |
| 5 psi | 0.3402299531 atm |
| 10 psi | 0.6804599062 atm |
| 11 psi | 0.7485058969 atm |
| 14.5 psi | 0.9866668641 atm |
| 14.7 psi | 1.0002760622 atm |
| 15 psi | 1.0206898594 atm |
| 20 psi | 1.3609198125 atm |
| 25 psi | 1.7011497656 atm |
| 30 psi | 2.0413797187 atm |
| 40 psi | 2.721839625 atm |
| 50 psi | 3.4022995312 atm |
| 60 psi | 4.0827594375 atm |
| 80 psi | 5.4436792499 atm |
| 100 psi | 6.8045990624 atm |
| 150 psi | 10.2068985936 atm |
| 200 psi | 13.6091981248 atm |
Atmosphere to PSI Conversion Table
| Atmosphere (atm) | PSI (psi) |
|---|---|
| 0.1 atm | 1.4695943006 psi |
| 0.25 atm | 3.6739857515 psi |
| 0.33 atm | 4.849661192 psi |
| 0.5 atm | 7.347971503 psi |
| 0.75 atm | 11.0219572545 psi |
| 1 atm | 14.695943006 psi |
| 1.5 atm | 22.043914509 psi |
| 2 atm | 29.391886012 psi |
| 2.5 atm | 36.739857515 psi |
| 3 atm | 44.087829018 psi |
| 5 atm | 73.47971503 psi |
| 10 atm | 146.9594300599 psi |
| 20 atm | 293.9188601199 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 in Mumbai or Chennai | 14.7 psi | 1.0002760622 atm |
| A full scuba cylinder in the Andamans | 3000 psi | 204.1379718727 atm |
| An airliner cabin on a Delhi–Mumbai flight | 11 psi | 0.7485058969 atm |
| A hyperbaric session at a city hospital | 37 psi | 2.5177016531 atm |
| A two-wheeler or bicycle tyre | 30 psi | 2.0413797187 atm |
| A CNG cylinder charge | 4500 psi | 306.206957809 atm |
When You Need PSI to Atmosphere Conversions
Scuba Dive Planning
Divers in Havelock or Pondicherry check a 3,000 PSI fill before the boat leaves — 204.1 atm absolute — then track depth in whole atmospheres, one added per 10 metres of seawater.
Hyperbaric Oxygen Therapy
A chamber gauge in a Chennai or Delhi hospital shows 36.7 PSI inside; converting gives 2.5 atm, the standard wound-treatment pressure for the session record.
Aircraft Cabin Checks
Engineers log a cabin pressure of 10.9 PSI at cruise altitude on a Delhi–Leh sector — 0.74 atm, matching the 8,000-foot (about 2,400-metre) equivalent cabin standard.
Pressure-Vessel Certification
A hydrostatic test presses a boiler or vessel to 100 PSI and the inspector's certification sheet needs 6.8 atm (about 689.5 kPa) as the recorded figure.
Related Pressure Conversions
How to Use
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1
Enter PSI Value
Type the PSI reading — typical entries include sea-level air (14.7 PSI), a filled dive cylinder for a Havelock trip (3,000 PSI), and your car tyre at the petrol-pump air station (32 PSI)
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2
View Atmosphere Result
The atm equivalent appears instantly. For example, a 32 PSI tyre reading 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. On the Bangalore plateau, some 900 metres above sea level, ambient air is already only about 0.90 atm, so allow for that
Why Use Be Converter?
Instant Conversion
Get precise PSI to atm results in real time as you type — handy for dive planning in the Andamans and for pressure-cooker or garage gauge checks
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 everyday Indian values like 32 PSI hatchback tyre (2.18 atm), 36 PSI SUV tyre (2.45 atm), and 3,000 PSI dive cylinder (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 translates gauge readings into earth-scale terms for Indian users. Whether you are checking tyre pressure before a Mumbai to Pune run on the Expressway, planning a scuba dive off Havelock Island or Netrani, verifying a pressure-cooker rating of roughly 15 PSIG (about 2 atm absolute), or cross-checking a hyperbaric chamber log in a Delhi or Chennai hospital, this tool delivers the exact equivalent. PSI remains common on Indian gauges alongside kg/cm², 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 (hatchback tyre), 36 PSI ≈ 2.45 atm (SUV tyre), and 3,000 PSI ≈ 204.1 atm (dive cylinder) — and your kitchen pressure cooker runs at roughly 15 PSIG, about 2 atm absolute
In diving, add one atmosphere per 10 metres of seawater: at 20 metres off Netrani Island or Havelock 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 chamber gauge — and treatment logs in Indian hospitals may require both figures
Aircraft cabins hold near 10.9 PSI absolute at cruise (0.74 atm), equivalent to an 8,000-foot (about 2,400-metre) mountain altitude — a handy check on a Delhi–Leh flight, where the destination airport itself sits above 3,000 metres
Always settle gauge-vs-absolute before converting: PSIG readings omit the 14.7 PSI of ambient air, dive and medical numbers are almost always absolute, and at hill-station altitude the ambient correction shrinks