Pressure Converter

1 bar equals 14.5038 psi. A car tire inflated to 2.3 bar is about 33.4 psi - just multiply bar by 14.5038 to convert. Bar is the standard on European pressure gauges; psi is the default in the US. Both express absolute or gauge pressure, so the math translates directly.

Standard atmospheric pressure is exactly 1 atm, which equals 101,325 Pa (101.325 kPa), 1.01325 bar, and 760 torr. It is about 14.6959 psi and 760 conventional mmHg. Weather reports sometimes call the pascal value 1,013.25 hPa.

Blood pressure has been reported in millimeters of mercury since mercury manometers were the standard clinical tool in the 19th century. The unit stuck because regulators and clinicians built reference ranges around it. A reading of 120/80 mmHg converts to roughly 16.0/10.7 kPa, though medical guidelines still use mmHg worldwide.

A torr is exactly 1/760 of a standard atmosphere, or 101,325 / 760 Pa. A conventional mmHg is 133.322387415 Pa. The values differ by about 0.000014%, so most practical measurements cannot resolve the gap, but this calculator preserves the distinction.

Inches of mercury (inHg) is used in US aviation for altimeter settings and in US weather reports for barometric pressure. 1 inHg equals 3,386.39 Pa, or about 0.0334 atm. Standard sea-level pressure is 29.9213 inHg. Actual altimeter settings vary with local pressure and weather.