Bar to PSI Converter
One bar equals exactly 100,000 pascals. One pound per square inch equals exactly 6894.757293168 pascals. Therefore 1 bar ≈ 14.503773773 psi.
Formula
psi = bar × 14.503773773020924
Reverse:
bar = psi × 0.0689475729316836
Formula variables
- bar — pressure in bar. 1 bar = 100,000 Pa exactly.
- psi — pressure in pounds per square inch. 1 psi = 6894.757293168 Pa.
- 14.503773773020924 — the ratio 100,000 / 6894.757293168, exact to the precision of the psi definition.
Worked Examples
Example 1: 1 bar to psi
- Start: 1 bar = 100,000 Pa.
- Divide by psi equivalent: 100,000 ÷ 6894.757293168 = 14.503773773020924.
- Result: 1 bar ≈ 14.5038 psi.
Example 2: 2.5 bar to psi (typical car tire pressure)
- Start: 2.5 bar.
- Multiply: 2.5 × 14.503773773020924 = 36.25943443255231.
- Result: 2.5 bar ≈ 36.259 psi.
Example 3: 10 bar to psi
- Start: 10 bar.
- Multiply: 10 × 14.503773773020924 = 145.03773773020924.
- Result: 10 bar ≈ 145.038 psi.
Common Conversion Table
| Bar | PSI |
|---|---|
| 0.5 | 7.252 |
| 1 | 14.504 |
| 1.5 | 21.756 |
| 2 | 29.008 |
| 2.5 | 36.259 |
| 3 | 43.511 |
| 5 | 72.519 |
| 10 | 145.038 |
| 20 | 290.075 |
| 50 | 725.189 |
Where Each Unit Is Used
- Bar: The standard pressure unit in most of Europe, used for tire pressure, weather (millibar), scuba tanks, and industrial processes.
- PSI: The standard pressure unit in the United States, used for tire pressure, plumbing, HVAC, hydraulics, and industrial equipment.
- Both: Automotive contexts often quote tire pressure in both units. A typical passenger car tire is inflated to 2.2–2.5 bar (32–36 psi).
Tire Pressure Reference
| Application | Bar | PSI |
|---|---|---|
| Passenger car (typical) | 2.2–2.5 | 32–36 |
| Compact spare tire | 4.2 | 60 |
| Bicycle (road tire) | 6.9–8.3 | 100–120 |
| Bicycle (mountain tire) | 1.4–2.4 | 20–35 |
| Truck tire | 7.6–9.0 | 110–130 |
Unit Definitions
Bar
A metric unit of pressure equal to exactly 100,000 pascals. It is not an SI unit but is accepted for use with SI. Its value was chosen so that atmospheric pressure at sea level is approximately 1 bar (about 1.013 bar). The millibar is commonly used in meteorology.
PSI (Pound per Square Inch)
A US customary and imperial unit of pressure. It is defined as one pound-force applied over an area of one square inch. In SI terms, 1 psi = 6894.757293168 pascals. The value derives from the exact pound-mass definition (0.45359237 kg) and the standard acceleration of gravity (9.80665 m/s²).
Related Converters
- PSI to Bar — the reverse conversion
- kPa to PSI
- mmHg to kPa
- All Pressure Converters
Frequently Asked Questions
How do you convert bar to psi?
Multiply the bar value by 14.503773773020924. For example, 2.5 bar × 14.503773773020924 ≈ 36.259 psi.
What is 1 bar in psi?
1 bar ≈ 14.5038 psi.
What is 2.5 bar in psi?
2.5 bar ≈ 36.259 psi. This is a common passenger car tire pressure in Europe.
What is 32 psi in bar?
32 psi × 0.0689475729316836 ≈ 2.206 bar. This is a common US passenger car tire pressure.
Is a bar the same as an atmosphere?
No. One bar = 100,000 Pa exactly, while one standard atmosphere = 101,325 Pa exactly. So 1 atm ≈ 1.01325 bar. They are close but not identical.