Fluid ounces (US labeling) to teaspoons (metric) conversion calculator shown above calculates how many teaspoons (metric) are in 'X' fluid ounces (US labeling) (where 'X' is the number of fluid ounces (US labeling) to convert to teaspoons (metric)). In order to convert a value from fluid ounces (US labeling) to teaspoons (metric) (from fl oz to tsp) just type the number of fl oz to be converted to tsp and then click on the 'convert' button.