like Tom notes table salt and kosher salt have different volume:weight ratios. Therefore it is best to learn the differences by weighing each; even different brands of kosher salt will vary significantly. It is best to develop a weight ratio that works for you. Same with sugars; brown sugar vs. granulated sugar are not interchangable by volume; best to use weights.
do not use table salt with iodine. Canning & Pickling salt is table salt without iodine.