Convert from Tablespoon [UK] to Teaspoon [metric]

Unit Definition (Tablespoon [UK])
The tablespoon is a unit of volume used in food recipes. In Britain, traditional tablespoons varied somewhat in size, and various older references give sizes in the range from 1/2 to 5/8 Imperial fluid ounce (14.2-17.6 milliliters). The traditional British tablespoonful was often equal to 4 teaspoonfuls or 1/10 teacupful.

Unit Definition (Teaspoon [metric])
The teaspoon is a unit of volume used in food recipes. In metric kitchens in Britain, Canada, Australia, and New Zealand, a teaspoonful is exactly 5 milliliters.