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