inHg to mmHg Conversion Table

The conversion calculation from inches of mercury column to millimetres of mercury column over the vacuum and atmospheric pressure range is as follows:

• 1 mmHg = 133.322 pascals (Pa)
• 1 inHg = 3386.39 pascals (Pa)
• mmHg value x 133.322 Pa = inHg value x 3386.39 Pa
• mmHg value = inHg value x 25.4

Alternatively a simpler and more obvious calculation can be used from the known conversion factor for a length measured in inches converted to millimetres:

• 1 inch = 25.4 mm
• mmHg value = inHg value x 25.4

Converter Tool

Enter a pressure in inHg 0°C below to convert it to the equivalent pressure in mmHg 0°C.

From		inHg 0°C
To		mmHg 0°C

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Conversion Table

Choose a value between 0 and 40 inHg 0°C from the pressure conversion table below, to obtain the converted value in mmHg 0°C.

inHg 0°C	mmHg 0°C	🔗