Pressure Converters
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SI / Metric
pascals
kilopascals
megapascals
bar
millibars
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Imperial
PSI
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Reference
atmospheres
⚗️
Scientific
torr
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Medical
mmHg
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Aviation
inches of mercury
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Engineering
inches of water
About pressure conversions
Pressure conversions are needed in engineering, medicine, meteorology, and aviation. The SI unit is the pascal (Pa), but many fields use their own preferred units — PSI in the US for tires and hydraulics, bar in European engineering, mmHg in medicine for blood pressure, and millibars in weather forecasting.
One atmosphere (atm) equals 101,325 pascals, 14.696 psi, or 1.01325 bar. Normal blood pressure of 120/80 corresponds to 120/80 mmHg. These conversions are not available in Google's built-in converter, making them strong SEO targets.
For the international definition, see the NIST reference on SI units of pressure.
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