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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
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 |
| millimeter 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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.