Atmospheres to Inches of mercury converter

To convert atmospheres to inches of mercury, enter the value in the first field. The result in inches of mercury is calculated automatically using the exact conversion factor.

1 atm ≈ 29.9212555797 inHg
1 inHg ≈ 0.033421057393 atm

Formula: inHg ≈ atm × 29.9212555797
atm ≈ inHg × 0.033421057393

Definitions: 1 atm = 101325 Pa; 1 inHg = 25.4 mmHg

The standard atmosphere (atm) is exactly 101,325 pascals, the average air pressure at sea level. It is a reference pressure in chemistry and physics and is used to express high pressures as multiples of atmospheric pressure.

The inch of mercury (inHg) is the pressure at the base of a one-inch column of mercury. It is used in the United States for barometric pressure in weather reports and for altimeter settings in aviation, where standard sea-level pressure is 29.92 inHg.

See the conversion table with commonly used values, handy for quick reference or study.