How do I convert bar to psi?
Type a value in either box, and the answer shows it in the other unit as you type.
- Pounds per square inch (psi)
- 14.503774
1 bar = 14.503774 psi.
Pounds per square inch (psi): 14.503774. 1 bar = 14.503774 psi.
Pounds per square inch (psi) by bars (bar)
How to calculate
Converts bars (bar) to pounds per square inch (psi) and back, with the exact unit definitions.
Example with the default inputs (Bars (bar) 1): 1 bar = 14.503774 psi.
Formula: psi = bar × 14.503773773
- 1 bar = 14.503773773 pounds per square inch, from the exact definitions in NIST SP 811.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.
Worked examples
Each example is checked against the calculator on every build.
- Bars (bar) 1 gives Pounds per square inch (psi) 14.503774.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Bars (bar) 2.2 gives Pounds per square inch (psi) 31.908302.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Pounds per square inch (psi) 31.908302 gives Bars (bar) 2.2.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
Other questions people ask
How many pounds per square inch are in a bar?
1 bar is 14.503774 pounds per square inch, from the exact unit definitions (NIST SP 811).
How do I convert bar to psi?
Multiply by 14.503774: psi = bar × 14.503773773. For example, 1 bar × 14.503774 = 14.503774 psi.
How do I convert psi back to bar?
Multiply by 0.068948, or type the pounds per square inch into the second box and the converter works it out. 1 pound per square inch is 0.068948 bars.
Where does 14.5 psi per bar come from?
A bar is exactly 100,000 Pa, and a psi is one pound-force per square inch: 4.4482216152605 N ÷ 0.00064516 m² = 6,894.757293168 Pa (NIST SP 811). So 1 bar = 100,000 ÷ 6,894.757293168 = 14.503774 psi.
What is 2.2 bar in psi?
31.908302 psi: 2.2 × 14.50377377.
Does it matter if the pressure is gauge or absolute?
Not for the factor. A gauge reading in bar gives a gauge reading in psi (psig), and an absolute one gives psia. Do not mix them: absolute pressure is gauge pressure plus the air pressure around it.
How many bar is a standard atmosphere?
1.01325 bar: a standard atmosphere is exactly 101,325 Pa (NIST SP 811), which is 14.695949 psi.