mm Hg to ATM Converter

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Choose whether to start with mmHg or atm.
Pressure in millimeters of mercury. 760 mmHg is exactly 1 standard atmosphere.
mmHg
Atmospheres
1atm

Pressure in standard atmospheres (1 atm = 760 mmHg)

Kilopascals101.325kPa
Pascals101,325.01Pa
Bar1.01325bar
Pounds per square inch14.6959psi
Torr760.0001Torr
1 atm
Low / vacuum<0.5Near sea level0.5-1.05Elevated1.05-2High pressure2+

760.00 mmHg = 1.000000 atm

  • This is exactly standard atmospheric pressure at sea level (0 degrees Celsius).
  • This value falls within the typical range of atmospheric pressure at sea level (720-790 mmHg), consistent with standard weather conditions.
  • Equivalent values: 101.325 kPa, 101325 Pa, 1.01325 bar, 14.6959 psi.

Next stepFor gauge pressure (pressure relative to atmosphere rather than absolute zero), subtract 1 atm from the absolute result. Most industrial gauges show gauge pressure.

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