Quick Answer
1 pound per square inch (psi) = 0.068948 bar (bar), and 1 bar = 14.5038 psi. Bar is the larger unit, so the same physical amount needs a bigger number when measured in psi. Convert either way with the live tool below or the dedicated converter pages.
Key Facts
- 1 pound per square inch (psi) = 0.068948 bar
- 1 bar (bar) = 14.5038 psi
- Conversion is exact multiplication - no rounding in the factor
- Table below covers common values in both directions
- Dedicated converters: psi→bar and bar→psi pages with live tools
Frequently Asked Questions
Which is bigger, a pound per square inch or a bar?
One pound per square inch equals 0.068948 bar, and one bar equals 14.5038 psi. The unit with the larger factor is the physically bigger one.
How do I convert psi to bar?
Multiply by the factor: value in bar = value in psi × 0.068948. Example: 5 psi = 0.344738 bar. Reverse: divide by 0.068948 (or multiply by 14.5038).
Why are psi and bar different?
They are two different units measuring the same physical quantity. A pound per square inch is defined as exactly 0.068948 bar, and a bar as exactly 14.5038 psi. Because the units differ in size, the number you write down for the same amount depends on which unit you use - the conversion factor itself is exact, with no rounding.
Is there a quick way to convert without a calculator?
Memorize the 1-to factor: 1 pound per square inch ≈ 0.068948 bar. Then multiply. For 2 psi that's ≈ 0.137895 bar.