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.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
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 Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.