Pounds per square inch to bar
Multiply pounds per square inch by 0.0689476 to get bar.
30 psi = 2.0684 bar
How to convert pounds per square inch to bar
The bar is exactly 100 000 pascals (100 kPa), close to one atmosphere. The pound per square inch is pounds-force per square inch, exactly 6894.757293168 pascals.
Worked example — 30 psi: 30 × 0.0689476 = 2.0684 bar.
Pounds per square inch to bar table
| Pounds per square inch | Bar |
|---|---|
| 1 psi | 0.0689476 bar |
| 5 psi | 0.344738 bar |
| 10 psi | 0.689476 bar |
| 20 psi | 1.379 bar |
| 30 psi | 2.0684 bar |
| 32 psi | 2.2063 bar |
| 35 psi | 2.4132 bar |
| 50 psi | 3.4474 bar |
| 100 psi | 6.8948 bar |
Reverse and related
About pounds per square inch and bar
Pound per square inch (psi)
1 psi = 0.0689476 barDefinition. Pounds-force per square inch, exactly 6894.757293168 pascals
History and origin
The pound per square inch comes from the imperial system, expressing pressure as pounds-force spread over a square inch. It equals about 6895 pascals.
Current use
Psi is the everyday pressure unit in the United States for tyre pressure, plumbing and compressed air.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Bar (bar)
1 bar = 14.5038 psiDefinition. Exactly 100 000 pascals (100 kPa), close to one atmosphere
History and origin
The bar was introduced in the early twentieth century by the meteorologist Vilhelm Bjerknes, defined as exactly 100 000 pascals, close to average sea-level air pressure. Its name comes from the Greek for weight.
Current use
The bar is common outside the United States for tyre pressure, diving and weather, where the closely related millibar is also used.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Where people use this
Pounds per square inch: tyre pressure in the US, plumbing, compressed air. Bar: tyre pressure outside the US, diving, weather. A 32 psi tyre is about 2.2 bar.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi).
Questions people ask
How many bar is 32 psi?
A 32 psi tyre is about 2.2 bar, and 35 psi is about 2.41 bar.
How many bar is 1 psi?
One psi is about 0.069 bar. To convert psi to bar, divide by 14.5.
How do you convert psi to bar?
Divide the psi by 14.5, or multiply by 0.069. A typical 30 psi tyre is about 2.07 bar.
How many bar is 100 psi?
100 psi is about 6.89 bar.