Tablespoons (FDA) to cubic millimeters conversion calculator shown above calculates how many cubic millimeters are in 'X' tablespoons (FDA) (where 'X' is the number of tablespoons (FDA) to convert to cubic millimeters). In order to convert a value from tablespoons (FDA) to cubic millimeters (from tbsp to mm³) simply type the number of tbsp to be converted to mm³ and then click on the 'convert' button.