2.5 mL = 2.5 cc = 1/2 teaspoon (tsp) 5 mL = 5 cc = 1 tsp. 15 mL = 15 cc = 3 tsp = 1 tablespoon (tbl or Tbsp) 30 mL = 30 cc = 2 Tbsp = 1 fluid ounce (oz) Using kitchen silverware instead of a measuring device that comes with a. medicine can result in the wrong dosing -- too much or too little of the medicine.