Teaspoons (UK) to cubic inches conversion calculator shown above calculates how many cubic inches are in 'X' teaspoons (UK) (where 'X' is the number of teaspoons (UK) to convert to cubic inches). In order to convert a value from teaspoons (UK) to cubic inches (from tsp to cu in) type the number of tsp to be converted to cu in and then click on the 'convert' button.