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.
- Exact standard factors are used where the standard defines them; factors are shown to full precision in the formula panel.
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
value × source factor ÷ target factor via the pascal base unit
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.
- Rounding is display-only; the calculator keeps full precision internally.
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 tape measure is only good to ~1 mm and a kitchen scale to ~1 g, so 3–4 significant figures already exceeds the measurement's own 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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