This calculator allows you to convert from Gigapascal to Kilogram-force/sq. millimeter and in a reverse direction. To convert from Gigapascal to Kilogram-force/sq. millimeter, enter the amount of Gigapascal into the first input and to convert from Kilogram-force/sq. millimeter to Gigapascal, enter the amount of Kilogram-force/sq. millimeter into the second input.