How many millibars are in 1 inch of mercury?

1 inch of mercury equals 33.8639 mbar.

How do I convert millibars back to inches of mercury?

Use the reverse converter: 1 millibar equals 0.02953 inHg.

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

To convert inches of mercury to millibars, multiply the value by 33.86389.

mbar = inHg × 33.86389

40 inHg × 33.86389 = 1354.56 mbar

Inch Of Mercury (inHg): Used for barometric pressure in US weather and aviation. About 3,386.389 pascals.
Millibar (mbar): One thousandth of a bar (100 Pa, equal to a hectopascal), used in meteorology.

How do I convert inches of mercury to millibars?: To convert inches of mercury to millibars, multiply the value by 33.86389.
How many millibars are in 1 inch of mercury?: 1 inch of mercury equals 33.8639 mbar.
How many millibars are in 10 inches of mercury?: 10 inHg equals 338.639 mbar.
How do I convert millibars back to inches of mercury?: Use the reverse converter: 1 millibar equals 0.02953 inHg.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.