# Inch of mercury conversions

pressure conversions » inch of mercury conversionsThe online converter calculator on this page allows you to select the pressure/stress measurement unit you want 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.

## What is inch of mercury?

### Definition:

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. It 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 (inH2O), 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.

*Notes:*

(i) The SI is an abbreviation for the International System of Units

(ii) The density of mercury at 0 °C is approximately 13.5951 g/cm3

(iii) According to the General Conference on Weight and Measures, the standard gravity is 9.80665 m/s² (or 32.1740 ft/s²)

### Symbol:

inHg

### Plural:

inches of mercury

Below you can find a comprehensive list with conversions from inches of mercury to other (metric, imperial, or customary) pressure and stress measurement units.