This calculator allows you to convert from Millimeter water (4°C) to Inch mercury (32°F) and in a reverse direction. To convert from Millimeter water (4°C) to Inch mercury (32°F), enter the amount of Millimeter water (4°C) into the first input and to convert from Inch mercury (32°F) to Millimeter water (4°C), enter the amount of Inch mercury (32°F) into the second input.