Millimeters of mercury to Atmospheres converter

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

1 mmHg ≈ 0.00131578966114 atm
1 atm ≈ 759.999891726 mmHg

Formula: atm ≈ mmHg × 0.00131578966114
mmHg ≈ atm × 759.999891726

Definitions: 1 mmHg = 133.322387415 Pa; 1 atm = 101325 Pa

The millimeter of mercury (mmHg) is the pressure at the base of a one-millimeter column of mercury. It is the unit of blood pressure in medicine, for example 120/80 mmHg, and is also used for some barometric and vacuum readings.

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.

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