Inch of Mercury

inHg

Commonly Used

The inch of mercury is a unit of pressure based on the height of a column of mercury that the pressure can support. It's the standard unit for barometric pressure in US weather reports.

Quick Converter

1 Pa = kPa

Controls display format. Very small or very large numbers will be shown in scientific notation (e.g., 1.5e-6).

Inch of Mercury (inHg)

The inch of mercury is a unit of pressure based on the height of a column of mercury that the pressure can support. It’s the standard unit for barometric pressure in US weather reports.

Characteristics

  • Common in: US weather forecasts, aviation
  • Standard atmosphere: approximately 29.92 inHg
  • Based on: height of mercury column at 0°C
  • 1 inHg = 3,386.39 Pa
  • Also called: inches Hg, “Hg

Applications

  • Weather forecasting and barometric pressure
  • Aviation altimeter settings
  • Medical vacuum equipment
  • HVAC system specifications

Conversions

  • 1 inHg = 33.8639 mbar
  • 1 inHg = 0.0334211 atm
  • 1 inHg = 25.4 mmHg
  • 1 inHg = 0.491154 psi

Related Units

Used In Regions

United States Aviation
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