Bar to PSI Converter
Convert bar to pounds per square inch — one bar is 14.5 psi. Results update as you type; exact factors shown.
One bar is 14.5038 pounds per square inch — see the exact factor, not a rounded rule of thumb.
How the bar 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 bar | 7.2519 psi | bars to pounds per square inch |
| 1 bar | 14.5038 psi | bar to pounds per square inch |
| 1.5 bar | 21.7557 psi | bars to pounds per square inch |
| 2 bar | 29.0075 psi | bars to pounds per square inch |
| 2.2 bar | 31.9083 psi | bars to pounds per square inch |
| 2.5 bar | 36.2594 psi | bars to pounds per square inch |
| 3 bar | 43.5113 psi | bars to pounds per square inch |
| 4 bar | 58.0151 psi | bars to pounds per square inch |
| 5 bar | 72.5189 psi | bars to pounds per square inch |
| 6 bar | 87.0226 psi | bars to pounds per square inch |
| 8 bar | 116.0302 psi | bars to pounds per square inch |
| 10 bar | 145.0377 psi | bars 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
How many psi is 1 bar?
14.5038 psi.
What tyre pressure is 2.2 bar?
31.9 psi, a common car figure.
Is a bar the same as an atmosphere?
Almost — one atmosphere is 1.01325 bar, about 1.3% more.
Why do pressure gauges differ?
Most read gauge pressure, which is pressure above the surrounding air. Absolute pressure adds one atmosphere.
What is the SI unit?
The pascal. A bar is exactly 100,000 pascals.
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.