A tablespoon (tbsp., Tbsp., Tb., or T.) is a unit of measure used in cooking to measure volume. It is a large spoon that is either approximately or (in some countries) exactly equal to 15 ml. In the United States, a tablespoon is approximately 14.8 ml (0.50 US fl oz), while in the United Kingdom and Canada, it is exactly 15 ml (0.51 US fl oz). In Australia, a tablespoon is 20 ml (0.68 US fl oz). A typical large dinner spoon is about 1 tablespoon in size, but it is not to be confused with a regular spoon, which is smaller. The abbreviation for tablespoon is commonly written as tbsp. or Tbsp..