# Inch of mercury conversions

The inch of mercury conversion selector here selects the pressure/stress measurement unit to convert to starting from inches of mercury (inHg). To make a conversion starting from a unit of pressure other than inch of mercury, simply click on the "Reset" button.

## About inch of mercury

The **inch of mercury** is a non-SI unit of pressure equal to about 3,386.389 pascals (1 inHg = 3,386.389 Pa), the SI derived unit of pressure.

The inch of mercury (inHg) is also equal to 33.86389 hectopascals (hPa), or 3.386389 kilopascals (kPa), or about 0.0334172218 atmospheres (atm), or 0.0338639 bars (bar), or 25.4 millimeters of mercury at 0 °C (mmHg), or 13.5951 inches of water at 4 °C (inH_{2}O), or 0.491098 pounds per square inch (psi), or 70.7181 pounds per square foot (psf) or 25.4 torr (Torr).

The inches of mercury is the pressure applied by a column of mercury one inch high at 0 °C in a gravitational field.

The inch of mercury unit is used in the United States and Canada for barometric pressure in aviation and weather reports.

Symbol: inHg

Plural: inches of mercury