A tablespoon is a unit of measure equal to 1/16 cup, 3 teaspoons, or 1/2 fluid ounce in the USA. It is either approximately or (in some countries) exactly equal to 15 mL. Tablespoon may be abbreviated as T (note: uppercase letter), tbl, tbs or tbsp. A typical large dinner spoon is about 1 tablespoon in size.