PSI to Bar
Convert PSI to Bar
"PSI to Bar" Calculator
How to convert pounds per square inch to bars
Worked example: 35 psi ≈ 2.41 bar
35 psi × 4.4482216152605 ÷ 64.516 ≈ 2.41 bar
64.516 = 100,000 Pa in a bar × 0.00064516 m² in a square inch; 4.4482216152605 N in a pound-force
Rule: bars = pounds per square inch × 4.4482216152605 ÷ 64.516 ≈ pounds per square inch ÷ 14.5038 — 1 psi = 1 lbf/in².
| Pounds per square inch | Bars |
|---|---|
| 1 psi | 0.0689 bar |
| 14.7 psi | 1.01 bar |
| 15 psi | 1.03 bar |
| 20 psi | 1.38 bar |
| 30 psi | 2.07 bar |
| 32 psi | 2.21 bar |
| 33 psi | 2.28 bar |
| 35 psi | 2.41 bar |
| 36 psi | 2.48 bar |
| 40 psi | 2.76 bar |
| 42 psi | 2.9 bar |
| 50 psi | 3.45 bar |
| 60 psi | 4.14 bar |
| 80 psi | 5.52 bar |
| 100 psi | 6.89 bar |
| 120 psi | 8.27 bar |
| 150 psi | 10.34 bar |
| 200 psi | 13.79 bar |
| 1,000 psi | 68.95 bar |
| 3,000 psi | 206.84 bar |
See Also
- Bar to PSI - Convert Bar to PSI
- 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 bar is 1 psi?
1 psi ≈ 0.0689476 bar, and 1 bar ≈ 14.5038 psi. Exactly, bar = psi × 4.4482216152605 ÷ 64.516: the fraction never ends, so every answer in bar is rounded.
Where do 4.4482216152605 and 64.516 come from?
A psi is one pound-force (4.4482216152605 N exactly) on one square inch, and a bar is exactly 100,000 Pa. 64.516 is 100,000 Pa in a bar times 0.00064516 m² in a square inch, so the answer in bar is the number of psi × 4.4482216152605 ÷ 64.516.
Gauge or absolute pressure: does it matter?
No, as long as both sides are of the same kind. Gauge pressure (psig, barg) counts from the surrounding air, absolute pressure (psia, bara) from vacuum, and the factor is the same for both. Tire and compressor gauges show gauge pressure.
Why is 14.7 psi about one atmosphere?
The standard atmosphere is exactly 101,325 Pa, which is ≈ 14.7 psi or 1.01325 bar. A tire gauge reads 0 at that air pressure: it shows how much more the tire holds.