Convert Millimeter Of Mercury to Atmosphere (mm hg to atm)

In next fields, kindly type your value in the text box under title [ From: ] to convert from Millimeter of Mercury to Atmosphere (mm hg to atm). As you type your value, the answer will be automatically calculated and displayed in the text box under title [ To: ].


Millimeter Of Mercury (abbreviations: mm Hg, or mmHg): is a manometric unit of pressure, equal to 133.322387415 pascals. It is the extra pressure generated by a column of mercury of one millimeter high.

Atmosphere (abbreviation: atm): is a unit of standard pressure, equal to 101325 Pa, or 1.01325 bar.

How to Convert Millimeters Of Mercury to Atmospheres

Example: How many Atmospheres are equivalent to 56.71 Millimeters of Mercury?


1 Millimeters of Mercury = 0.001316 Atmospheres

56.71 Millimeters of Mercury = Y Atmospheres

Assuming Y is the answer, and by criss-cross principle;

Y equals 56.71 times 0.001316 over 1

(i.e.) Y = 56.71 * 0.001316 / 1 = 0.07463036 Atmospheres

Answer is: 0.07463036 Atmospheres are equivalent to 56.71 Millimeters of Mercury.

Practice Question: Convert the following units into atm:

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 99.93 mm hg

( ii ) 31.6 mm hg

( iii ) 20.77 mm hg

  • Wikipedia
  • USMA
  • NIST

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