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