This calculator allows you to convert from Pound-force/square inch to Inch water (4°C) and in a reverse direction. To convert from Pound-force/square inch to Inch water (4°C), enter the amount of Pound-force/square inch into the first input and to convert from Inch water (4°C) to Pound-force/square inch, enter the amount of Inch water (4°C) into the second input.