Inch of mercury conversions

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The inch of mercury conversion selector above 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.

What is 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. 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

Inch of mercury conversions: direct access

A compehensive list with conversions from inches of mercury to other (metric, imperial, or customary) pressure and stress measurement units is displayed below.