Bar to PSI
Convert Bar to PSI
"Bar to PSI" Calculator
How to convert bars to pounds per square inch
Worked example: 2.5 bar ≈ 36.26 psi
2.5 bar × 64.516 ÷ 4.4482216152605 ≈ 36.26 psi
64.516 = 100,000 Pa in a bar × 0.00064516 m² in a square inch; 4.4482216152605 N in a pound-force
Rule: pounds per square inch = bars × 64.516 ÷ 4.4482216152605 ≈ bars × 14.5038 — 1 psi = 1 lbf/in².
| Bars | Pounds per square inch |
|---|---|
| 1 bar | 14.5 psi |
| 1.5 bar | 21.76 psi |
| 2 bar | 29.01 psi |
| 2.2 bar | 31.91 psi |
| 2.5 bar | 36.26 psi |
| 3 bar | 43.51 psi |
| 3.5 bar | 50.76 psi |
| 4 bar | 58.02 psi |
| 5 bar | 72.52 psi |
| 5.5 bar | 79.77 psi |
| 6 bar | 87.02 psi |
| 7 bar | 101.53 psi |
| 8 bar | 116.03 psi |
| 9 bar | 130.53 psi |
| 10 bar | 145.04 psi |
| 20 bar | 290.08 psi |
| 40 bar | 580.15 psi |
| 100 bar | 1,450.38 psi |
| 200 bar | 2,900.75 psi |
| 300 bar | 4,351.13 psi |
See Also
- PSI to Bar - Convert PSI to Bar
- kPa to PSI - Convert kPa to PSI
- MPa to kgf/cm² - Convert MPa to kgf/cm²
- Newton-Meters to Foot-Pounds - Convert Newton-Meters to Foot-Pounds
- Foot-Pounds to Newton-Meters - Convert Foot-Pounds to Newton-Meters
- Newton-Meters to Inch-Pounds - Convert Newton-Meters to Inch-Pounds
- Inch-Pounds to Newton-Meters - Convert Inch-Pounds to Newton-Meters
FAQ
How many psi is 1 bar?
1 bar ≈ 14.5038 psi. Exactly, psi = bar × 64.516 ÷ 4.4482216152605. The factor never ends as a decimal, so almost every answer in psi is rounded and shown after ≈; an answer that comes out exact is shown with =.
Where does 14.5038 come from?
A psi is one pound-force on one square inch: exactly 4.4482216152605 N on exactly 0.00064516 m², about 6,894.76 Pa. A bar is exactly 100,000 Pa, so a bar holds 100,000 × 0.00064516 ÷ 4.4482216152605 psi, which is 64.516 ÷ 4.4482216152605. The division never ends: in lowest terms it is 129,032,000,000,000 ÷ 8,896,443,230,521, and 8,896,443,230,521 has prime factors other than 2 and 5 (7, for one).
Gauge or absolute pressure: does it matter?
No, as long as both sides are of the same kind. Gauge pressure (barg, psig) counts from the surrounding air, absolute pressure (bara, psia) from vacuum, and the factor is the same for both. Tire and compressor gauges show gauge pressure.
How many atmospheres is 1 bar?
1 bar ≈ 0.987 standard atmospheres (1 atm is exactly 101,325 Pa) and ≈ 1.02 technical atmospheres (1 kgf/cm², exactly 98,066.5 Pa). Every answer on this site also shows kgf/cm² and atm.