Use this useful tool to convert surface tension choosing one of the 8 units of measurment included in this app (with the availability to add custom units), that are:
newton/meter, millinewnon/meter, gram-force/centimeter, dyne/centimeter, erg/square centimeter, erg/square millimeter, pound-force/inch, poundal/inch.
For every units of measurment are also included formulas to convert that unit as you want.