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