Uses the exact definition 1 bar = 14.503773773 psi. Try 32 psi (a common car tire pressure) or 14.5 psi (about 1 bar).
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What does this converter do?
PSI to bar converter: convert psi to bar and bar to psi using the exact definition 1 bar = 14.503773773 psi, with a reference table. Free, instant, runs in your browser.
- 1 psi = 6.895 kilopascal · 1 bar = 1e+05 pascal · 1 atmosphere = 101.3 kilopascal
- All conversions route through the pascal as the base unit, so every pair of units agrees regardless of which two you enter.
- Standard factors are shown in the formula panel at the precision the calculator actually uses, so the arithmetic and the panel agree.
Reference factors (pressure)
Exact factors in terms of the pascal, from NIST standards:
- 1 pascal = 1 pascal
- 1 kilopascal = 1000 pascal
- 1 psi = 6894.76 pascal
- 1 bar = 100000 pascal
- 1 atmosphere = 101325 pascal
How this calculator works
Formula
psi = bar x 14.503773773 and bar = psi / 14.503773773 - exact by definition, since 1 bar = 14.503773773 psi.
Worked example
1 psi = 6.895 kilopascal · 1 bar = 1e+05 pascal · 1 atmosphere = 101.3 kilopascal
Sources
Sources support the method, terminology, or planning context. Editable assumptions remain your responsibility.
Assumptions to verify
- Inputs are treated as exact decimal values.
- Standard (not historical or survey) unit definitions are used.
- The calculation uses the factors at the precision shown in the formula panel; rounding beyond that is display-only and adds no accuracy.
Frequently asked questions
Why convert through pascal instead of directly?
Routing every unit through a single base (pascal) means each unit needs only one exact factor against the standard, and any pair combines cleanly. Direct pair factors drift apart over time in hand-maintained tables; a base-unit graph cannot.
Where do these exact factors come from?
From published standards (NIST: SP 811 pressure conversions). Units like the inch are defined exactly (1 in = 2.54 cm since 1959), so conversions between standard units are exact, not approximate.
How many decimal places should I trust?
The math is exact to the precision shown. The practical limit is your input: a tyre gauge is usually specified to 3-4 significant figures, so extra digits beyond your reading do not add accuracy.
Cite this tool
BoringToolsKit. “PSI to Bar Converter.” boringtoolskit.com/psi-to-bar/ (reviewed 2026-09-20). Free to reference in articles, syllabi, and answer posts with a link.
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