There will be a bit of variation in a measurement because salt crystals are not a uniform size. Now the good news, thanks to the Salt Institute, which is a non-profit trade association for the salt industry. They have the straight scoop (no pun intended) on salt. Salt weighs about 6 grams per teaspoon or about 18 grams per tablespoon. That makes your 3 tablespoons of salt weigh in at about 54 grams.