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