PSI to Atmospheres Converter
Convert pounds per square inch to atmospheres — 14.696 psi is one atmosphere. Results update as you type; exact factors shown.
One pound per square inch is 0.068 standard atmospheres — see the exact factor, not a rounded rule of thumb.
How the psi to atmospheres converter works
Pressures convert through the pascal (1 N/m²). One bar is exactly 100 kPa; a standard atmosphere is exactly 101.325 kPa; 1 psi is 6.894757 kPa (a pound-force on a square inch); 1 mmHg is 133.322 Pa by the conventional definition.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 1 psi | 0.068 atm | pound per square inch to standard atmospheres |
| 5 psi | 0.3402 atm | pounds per square inch to standard atmospheres |
| 10 psi | 0.6805 atm | pounds per square inch to standard atmospheres |
| 14.696 psi | 1 atm | pounds per square inch to standard atmospheres |
| 20 psi | 1.3609 atm | pounds per square inch to standard atmospheres |
| 30 psi | 2.0414 atm | pounds per square inch to standard atmospheres |
| 32 psi | 2.1775 atm | pounds per square inch to standard atmospheres |
| 50 psi | 3.4023 atm | pounds per square inch to standard atmospheres |
| 100 psi | 6.8046 atm | pounds per square inch to standard atmospheres |
| 150 psi | 10.2069 atm | pounds per square inch to standard atmospheres |
| 200 psi | 13.6092 atm | pounds per square inch to standard atmospheres |
| 500 psi | 34.023 atm | pounds per square inch to standard atmospheres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in pascals |
|---|---|---|
| pascal | Pa | 1 pascal |
| kilopascal | kPa | 1,000 pascal |
| megapascal | MPa | 1,000,000 pascal |
| bar | bar | 100,000 pascal |
| millibar (hectopascal) | mbar | 100 pascal |
| standard atmosphere | atm | 101,325 pascal |
| pound per square inch | psi | 6,894.757293168 pascal |
| millimetre of mercury | mmHg | 133.322387415 pascal |
| inch of mercury | inHg | 3,386.389 pascal |
FAQFrequently asked questions about pressure conversion
How many psi in one atmosphere?
14.696 psi.
What is 30 psi in atm?
2.04 atm — a typical car tyre.
Is tyre pressure absolute or gauge?
Gauge — it is measured above atmospheric pressure, so a 30 psi tyre holds about 44.7 psi absolute.
What is 100 psi in atm?
6.80 atm.
Why does the US use psi?
It is the customary unit; the rest of the world moved to kPa or bar with metrication.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.