Bar to PSI Converter
Switch between metric bar labels and psi-only gauges without reaching for a pressure table. Enter either unit to get the paired reading, the working factor behind it, and a shareable link that restores the same conversion state.
Input Form
Main Result
Secondary Result
Open the current conversion path, reciprocal check, and display rules.
Secondary Result
Open the current conversion path, reciprocal check, and display rules.
Current conversion path
psi = 2 x 14.5037738 = 29.0075
bar check = 29.0075 / 14.5037738 = 2
Standards basis
1 bar = 100,000 Pa and 1 psi = 6,894.757 Pa. The bar-to-psi working factor on this page is derived from those two NIST-backed relationships.
Display precision
PSI results are shown to 4 decimals, bar results to 6 decimals, and trailing zeros are trimmed after the conversion is complete.
Formula Explanation
SI reference
Tie both pressure units back to pascals first
NIST lists bar as an accepted unit outside the SI and gives psi-to-pascal factors in Appendix B.8. The page uses those two definitions as one shared basis before it shows the converted unit.
Working factor
Use one derived ratio, then round only after conversion
The page derives 14.5037738 from the two unit definitions above, applies the same ratio in both directions, and trims trailing zeros only after the conversion is complete.
Use Scenarios
Gauge comparison
Match metric labels with psi-only gauges in a few seconds
Use the bar to psi converter when a compressor, regulator, or imported equipment label is written in bar but the gauge you have in hand reads only psi.
Reverse lookup
Translate US service readings back into bar for manuals and spec sheets
The same page also works in reverse, so a psi maintenance note can be checked against a metric data sheet without doing manual pressure math.
Table replacement
Spot-check a few common readings without hunting through a pressure table
This bar to psi converter is useful when you want a compact answer, the working factor behind it, and a shareable deep link instead of a large lookup chart.
Example Cases
Worked example
Case 1: Metric regulator label
Inputs
8 bar entered from a European-style label or data plate.
Computed Results
8 bar converts to 116.0302 psi.
Why it matters
This is the kind of quick conversion you make when a psi-only gauge needs to match a metric equipment label without rewriting the pressure note by hand.
Worked example
Case 2: US pressure switch setting
Inputs
100 psi entered from a service sheet, switch setting, or maintenance note.
Computed Results
100 psi converts to 6.894757 bar.
Why it matters
The reverse direction matters when a US pressure reading has to be compared with a metric spec sheet or translated for an export manual.
Worked example
Case 3: Decimal reading from a tire note
Inputs
2.2 bar entered as a simple field example.
Computed Results
2.2 bar converts to 31.9083 psi.
Why it matters
A decimal bar reading often turns into a whole-number-style psi check on a handheld gauge, so this case helps when you want the paired value without a large lookup chart.
Boundary Conditions
Sources & References
- NIST Guide to the SI, Chapter 5: Units outside the SIKept to support bar as an accepted unit outside the SI and to anchor the 100 kPa / 100,000 Pa definition used by the page.
- NIST Guide to the SI, Appendix B.8: Pressure conversion factorsUsed to anchor the psi-to-pascal relationship from which the page derives its bar-to-psi working factor and reciprocal conversion.