The tablespoon
The US tablespoon equals 1/2 US fluid ounce, or 14.7868 mL — exactly 3 US teaspoons. The UK tablespoon is 17.7582 mL (5/8 imperial fl oz), the Australian metric tablespoon is 20 mL, and most other metric countries use 15 mL. Always check the source's convention before scaling a recipe.