mmHg to PSI Converter

How to convert mmHg to PSI

To convert mmHg to PSI, multiply the value in mmHg by 0.019336714. For example, 5 mmHg = 0.096683568 psi.

If you need to convert from mmHg to PSI, the key figure to remember is that one mmHg equals 0.019336714 PSI. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert mmHg to psi with complete confidence.

Pressure conversions are used in weather forecasting, engineering, diving, automotive maintenance, and industrial processes. Different fields favor different units, making conversion a regular necessity.

Understanding mmHg and PSI

The pascal is the SI unit, but it's small, so kilopascals and bars are more practical for everyday use. PSI (pounds per square inch) dominates in US engineering and tire pressures, while atmospheres provide an intuitive reference point — 1 atm is roughly the air pressure at sea level. Weather reports use hectopascals or millibars, which are numerically identical.

How accurate is this conversion?

Pressure conversions are based on fixed physical definitions. One standard atmosphere equals exactly 101,325 pascals, and 1 bar equals exactly 100,000 pascals, so all conversions here are precise.

All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.

Quick reference: common mmHg to PSI values

The most frequently searched conversions are 1 mmHg = 0.019336714 PSI, 5 mmHg = 0.096683568 PSI, 10 mmHg = 0.19336714 PSI, and 100 mmHg = 1.9336714 PSI. The full table further down covers every common value, and the calculator handles any number you need in between.