Convert pressure measurements between pascals, kilopascals, bar, psi, atmospheres and torr.
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Result
0.001 kPa
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This tool converts between pressure units using fixed conversion factors, for example, 1 atmosphere equals 101,325 pascals, 14.696 psi, or 1.01325 bar. Enter a value in any supported unit and it's converted to all others using these standard ratios.
Psi is common for tire pressure and hydraulics in the US. Bar and kilopascals are widely used in most other countries and in scientific contexts. Atmospheres are often used for general reference points, and torr (roughly equal to mmHg) is common in vacuum measurement and meteorology.
Converting 32 psi (a typical car tire pressure) to bar gives approximately 2.21 bar (32 × 0.0689476), and converting that same 32 psi to atmospheres gives approximately 2.18 atm, useful for comparing a tire gauge reading against a specification sheet quoted in different units.
Confusing gauge pressure (measured relative to atmospheric pressure, what a tire gauge reads) with absolute pressure (measured relative to a vacuum), most everyday pressure readings like tire pressure are gauge pressure, mixing the two up introduces a roughly 14.7 psi (1 atm) offset.
Mixing up torr and mmHg as if they were meaningfully different, they're numerically almost identical (within 0.000015%), for everyday purposes they can be treated as the same unit.
Assuming 1 bar equals 1 atmosphere exactly, they're close (1 atm ≈ 1.01325 bar) but not identical, a distinction that matters in precise scientific or engineering work even though it's negligible for everyday use.
Multiply psi by 0.0689476 to get bar, or use this converter for an instant result.
Most passenger car tires are inflated to around 30-35 psi, which is roughly 2.07-2.41 bar.
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