Pressure converter: bar, psi, kPa and mmHg

Type a pressure such as 32 psi or 2.2 bar, or type in any field below: every other unit follows.

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Amount and unit

For example 32 psi, 2.2 bar, 120 mmHg in kPa, 1013 hPa in inHg.

Answer

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Definitions

bar, mbar, hPa: 1 bar is 100,000 Pa; a millibar is 100 Pa, the same as a hectopascal.NIST Special Publication 811, Appendix B.9.
psi: A pound-force on a square inch: 0.45359237 kg times standard gravity, 9.80665 m/s², over 0.0254 m squared, about 6,894.757 Pa, worked out exactly here.NIST Special Publication 811, Appendix B.9 and its note on the kilogram-force.
Atmosphere and torr: A standard atmosphere is 101,325 Pa exactly; a torr is 1/760 of it.BIPM, The International System of Units (SI Brochure), 9th edition, Appendix 1 (10th CGPM, 1954); NIST SP 811, Table 11.
mmHg and inHg: NIST gives 133.3224 Pa for a millimetre of mercury and 3,386.389 Pa for an inch: rounded values, so results in them are rounded. EU law uses mmHg for blood pressure.NIST Special Publication 811, Appendix B.9; Council Directive 80/181/EEC, Annex. Sources read on 10 October 2026.

Tyre pressures

bar	psi	kPa
1.8 bar	26.1 psi	180 kPa
2.0 bar	29.0 psi	200 kPa
2.2 bar	31.9 psi	220 kPa
2.4 bar	34.8 psi	240 kPa
2.6 bar	37.7 psi	260 kPa
3.0 bar	43.5 psi	300 kPa

psi rounded to a tenth. A tyre gauge shows the pressure above the air around it.