How many atmospheres are in 1 millimeter of mercury?

1 millimeter of mercury equals 0.00131579 atm.

How do I convert atmospheres back to millimeters of mercury?

Use the reverse converter: 1 atmosphere equals 760 mmHg.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert millimeters of mercury to atmospheres, multiply the value by 0.00131578966.

atm = mmHg × 0.00131578966

120 mmHg × 0.00131578966 = 0.1579 atm

Millimeter Of Mercury (mmHg): Used for blood pressure and vacuum measurement. About 133.322 pascals, from mercury barometers.
Atmosphere (atm): Standard atmosphere: exactly 101,325 pascals, the average air pressure at sea level.

How do I convert millimeters of mercury to atmospheres?: To convert millimeters of mercury to atmospheres, multiply the value by 0.00131578966.
How many atmospheres are in 1 millimeter of mercury?: 1 millimeter of mercury equals 0.00131579 atm.
How many atmospheres are in 10 millimeters of mercury?: 10 mmHg equals 0.0131579 atm.
How do I convert atmospheres back to millimeters of mercury?: Use the reverse converter: 1 atmosphere equals 760 mmHg.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.