Tsp, tbsp, cup, fl oz.
Converts between US baking measures: cups, tablespoons, teaspoons, and milliliters.
1 cup = 16 tbsp = 48 tsp = 236.588 mL.
These ratios are exact by US customary definition, which is why converting between cups, tablespoons, and teaspoons is more reliable than converting cups of an ingredient to grams — the volume relationships never change, even though weight-per-cup does.
1 US cup ≈ 15.997 tbsp (16 rounded).
3 teaspoons in one tablespoon.
Close but not identical: US tbsp ≈ 14.79 mL, UK tbsp = 15 mL, Australian = 20 mL. Rarely enough to ruin a recipe.
These are informal, imprecise terms — a pinch is generally taken to mean about 1/16 teaspoon and a dash slightly more, but neither is standardized the way cups and tablespoons are.