This calculator allows you to convert from Millimeter water (4°C) to Poundal/square foot and in a reverse direction. To convert from Millimeter water (4°C) to Poundal/square foot, enter the amount of Millimeter water (4°C) into the first input and to convert from Poundal/square foot to Millimeter water (4°C), enter the amount of Poundal/square foot into the second input.