How to convert barometric pressure to mmhg

Written by justin mikulka
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How to convert barometric pressure to mmhg
Barometer that reads barometric pressure in millimetres of mercury. (barometer image by Peter Baxter from

Barometric pressure is a measure of atmospheric pressure as measured by a barometer. Barometric pressure is commonly referenced in weather reports as either high or low. In the case of weather systems, the terms low and high are relative terms, meaning that system has either lower or higher barometric pressure than the surrounding areas. Many barometers use mercury to measure barometric pressure. Since the chemical symbol for mercury is Hg, readings of barometric pressure are often reported in inches of mercury (in/Hg) or millimetres of mercury (mmHg). One atmosphere of barometric pressure is equal to 760 millimetres of mercury.

Skill level:

Things you need

  • Calculator

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  1. 1

    Get your barometric pressure reading in atmospheres.

  2. 2

    Multiply the barometric pressure reading in atmospheres by 760 millimetres of mercury.

  3. 3

    Check your work using an online conversion tool like the one linked in the references below.

Tips and warnings

  • Other common conversions:
  • One atmosphere equals 66.7 Kilogram per square inch (PSI)
  • One atmosphere equals 29.92 inches of mercury (in/Hg)

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