How many inches of mercury are in 1 millimeter of mercury?

1 millimeter of mercury equals 0.0393701 inHg.

How do I convert inches of mercury back to millimeters of mercury?

Use the reverse converter: 1 inch of mercury equals 25.4 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 inches of mercury, multiply the value by 0.0393700746.

inHg = mmHg × 0.0393700746

40 mmHg × 0.0393700746 = 1.57 inHg

Millimeter Of Mercury (mmHg): Used for blood pressure and vacuum measurement. About 133.322 pascals, from mercury barometers.
Inch Of Mercury (inHg): Used for barometric pressure in US weather and aviation. About 3,386.389 pascals.

How do I convert millimeters of mercury to inches of mercury?: To convert millimeters of mercury to inches of mercury, multiply the value by 0.0393700746.
How many inches of mercury are in 1 millimeter of mercury?: 1 millimeter of mercury equals 0.0393701 inHg.
How many inches of mercury are in 10 millimeters of mercury?: 10 mmHg equals 0.393701 inHg.
How do I convert inches of mercury back to millimeters of mercury?: Use the reverse converter: 1 inch of mercury equals 25.4 mmHg.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.