Atmospheres to PSI Converter
Convert atmospheres to psi — one atmosphere is 14.696 psi. Results update as you type; exact factors shown.
One standard atmosphere is 14.6959 pounds per square inch — see the exact factor, not a rounded rule of thumb.
How the atmospheres to psi 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 |
|---|---|---|
| 0.5 atm | 7.348 psi | standard atmospheres to pounds per square inch |
| 1 atm | 14.6959 psi | standard atmosphere to pounds per square inch |
| 1.5 atm | 22.0439 psi | standard atmospheres to pounds per square inch |
| 2 atm | 29.3919 psi | standard atmospheres to pounds per square inch |
| 3 atm | 44.0878 psi | standard atmospheres to pounds per square inch |
| 4 atm | 58.7838 psi | standard atmospheres to pounds per square inch |
| 5 atm | 73.4797 psi | standard atmospheres to pounds per square inch |
| 10 atm | 146.9595 psi | standard atmospheres to pounds per square inch |
| 20 atm | 293.919 psi | standard atmospheres to pounds per square inch |
| 50 atm | 734.7974 psi | standard atmospheres to pounds per square inch |
| 100 atm | 1,469.5949 psi | standard atmospheres to pounds per square inch |
| 200 atm | 2,939.1898 psi | standard atmospheres to pounds per square inch |
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
What is one atmosphere in psi?
14.6959 psi.
What is a standard atmosphere?
101,325 pascals — average air pressure at sea level, fixed by definition.
How deep is two atmospheres of water?
About 10 metres, which adds one atmosphere to the one above the surface.
Is atm the same as bar?
Nearly — one atm is 1.01325 bar.
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.